C program to implement SJF algorithm.

Posted on May 5, 2012 by Sandeepa Nadahalli

Write a C program to implement SJF algorithm.
Shortest Job First(SJF) is the CPU scheduling algorithm. In SJF, if the CPU is available it allocates the process which has smallest burst time, if the two process are same burst time it uses FCFS algorithm.Read more about C Programming Language . and read the C Programming Language (2nd Edition) by K and R.

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
#include<conio.h>

void main()
{
    int i,j,n,brust_time[10],start_time[10],end_time[10],wait_time[10],temp,tot;
    float avg;
    clrscr();
    printf("Enter the No. of jobs:nn");
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        printf("n n Enter %d process burst time:n",i);
        scanf("%d",&brust_time[i]);
    }
    
    for(i=1;i<=n;i++)
    {
        for(j=i+1;j<=n;j++)
        {
            if(brust_time[i]>brust_time[j])
            {
                temp=brust_time[i];
                brust_time[i]=brust_time[j];
                brust_time[j]=temp;
            }
        }
        
        if(i==1)
        {
            start_time[1]=0;
            end_time[1]=brust_time[1];
            wait_time[1]=0;
        }
        
        else
        {
            start_time[i]=end_time[i-1];
            end_time[i]=start_time[i]+brust_time[i];
            wait_time[i]=start_time[i];
        }
    }
    printf("nn BURST TIME t STARTING TIME t END TIME t   WAIT TIMEn");
    printf("n ********************************************************n");
    for(i=1;i<=n;i++)
    {
        printf("n %5d %15d %15d %15d",brust_time[i],start_time[i],end_time[i],wait_time[i]);
    }
    printf("n ********************************************************n");
    for(i=1,tot=0;i<=n;i++)
    tot+=wait_time[i];
    avg=(float)tot/n;
    printf("nnn AVERAGE WAITING TIME=%f",avg);
    for(i=1,tot=0;i<=n;i++)
    tot+=end_time[i];
    avg=(float)tot/n;
    printf("nn AVERAGE TURNAROUND TIME=%f",avg);
    for(i=1,tot=0;i<=n;i++)
    tot+=start_time[i];
    avg=(float)tot/n;
    printf("nn AVERAGE RESPONSE TIME=%fnn",avg);
    getch();
}

Read more Similar C Programs
C Basic

Search Algorithms.

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link

K & R C Chapter 5 Exercise Solutions.

Posted on May 4, 2012 by Sandeepa Nadahalli

We have already provided solutions to all the exercises in the book “C Programming Language (2nd Edition)“ popularly known as K & R C book.

In this blog post I will give links to all the exercises from Chapter 5 of the book for easy reference.

Chapter 5: Pointers and Arrays

Exercise 5-1. As written, getint treats a + or – not followed by a digit as a valid representation of zero. Fix it to push such a character back on the input.
Solution to Exercise 5-1.

Exercise 5-2.Write getfloat , the floating-point analog of getint . What type does getfloat return as its function value?
Solution to Exercise 5-2.

Exercise 5-3.GWrite a pointer version of the function strcat that we showed in Chapter 2: strcat(s,t) copies the string t to the end of s .
Solution to Exercise 5-3.

Exercise 5-4. Write the function strend(s,t) , which returns 1 if the string t occurs at the end of the string s , and zero otherwise.
Solution to Exercise 5-4.

Exercise 5-5. Write versions of the library functions strncpy , strncat , and strncmp , which operate on at most the first n characters of their argument strings. For example, strncpy(s,t,n) copies at most n characters of t to s . Full descriptions are in Appendix B.
Solution to Exercise 5-5.

Exercise 5-6. Rewrite appropriate programs from earlier chapters and exercises with pointers instead of array indexing. Good possibilities include getline (Chapters 1 and 4), atoi , itoa , and their variants (Chapters 2, 3, and 4), reverse (Chapter 3), and strindex and getop (Chapter 4).
Solution to Exercise 5-6.
Exercise 5-7. Rewrite readlines to store lines in an array supplied by main , rather than calling alloc to maintain storage. How much faster is the program?
Solution to Exercise 5-7.

Exercise 5-8.There is no error-checking in day_of_year or month_day. Remedy this defect.
Solution to Exercise 5-8.

Exercise 5-9.Rewrite the routines day_of_year and month_day with pointers instead of indexing.
Solution to Exercise 5-9.

Exercise 5-10. Write the program expr , which evaluates a reverse Polish expression from the command line, where each operator or operand is a separate argument. For example, expr 2 3 4 + * evaluates 2 X (3+4).
Solution to Exercise 5-10.

Exercise 5-11. Modify the programs entab and detab (written as exercises in Chapter 1) to accept a list of tab stops as arguments. Use the default tab settings if there are no arguments.
Solution to Exercise 5-11.

Exercise 5-12. Extend entab and detab to accept the shorthand entab -m +n to mean tab stops every n columns, starting at column m . Choose convenient (for the user) default behavior.
Solution to Exercise 5-12.

Exercise 5-13. Write the program tail, which prints the last n lines of its input. By default, n is 10, say, but it can be changed by an optional argument, so that tail -n prints the last n lines. The program should behave rationally no matter how unreasonable the input or the value of n. Write the program so it makes the best use of available storage; lines should be stored as in the sorting program of Section 5.6, not in a two-dimensional array of fixed size.
Solution to Exercise 5-13.

Exercise 5-14. Modify the sort program to handle a -r flag, which indicates sorting in reverse (decreasing) order. Be sure that -r works with -n.
Solution to Exercise 5-14.
Exercise 5-15.Add the option -f to fold upper and lower case together, so that case distinctions are not made during sorting; for example, a and A compare equal.
Solution to Exercise 5-15.

Exercise 5-16.Add the -d (“directory order”) option, which makes comparisons only on letters, numbers and blanks. Make sure it works in conjunction with -f .
Solution to Exercise 5-16.

Exercise 5-17. Add a field-handling capability, so sorting may be done on fields within lines, each field sorted according to an independent set of options. (The index for this book was sorted with -df for the index category and -n for the page numbers.)
Solution to Exercise 5-10.

Exercise 5-18. Make dcl recover from input errors.
Solution to Exercise 5-18.

Exercise 5-19. Modify undcl so that it does not add redundant parentheses to declarations.
Solution to Exercise 5-19.

Exercise 5-20. Expand dcl to handle declarations with function argument types, qualifiers like const , and so on.
Solution to Exercise 5-20.

You can purchase the book from here or here.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link

C Program to demonstrate modf function.

Posted on April 18, 2012 by Sandeepa Nadahalli

Write a C program to demonstrate modf function.modf() defined in the C math.h library.
modf function breaks the double/float values to integral part and fractional part.
Example: res = modf(3.142, &iptr) returns res=142 and iptr=3. Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
#include<math.h>
#include<conio.h>
int main()
{
    double num,integral,result;
    clrscr();
    printf("n Enter fractional Numbern");
    scanf("%lf",&num);
    result = modf(num, &integral);
    
    printf("%.4lf = %.4lf + %.4lfn", num, integral, result);
    
    return 0;
}

Read more Similar C Programs
Matrix Programs
Learn C Programming

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link

C Program to check whether two strings are anagrams of each other.

Posted on April 17, 2012July 13, 2017 by Sandeepa Nadahalli

C Strings:
Write a c program to check whether two strings are anagrams of each other.
Two strings are said to be anagrams, if the characters in the strings are same in terms of numbers and value ,only arrangement or order of characters are may be different.

Example: “dfghjkl” and “lkjghdf” are anagrams of each other.
Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
#include<string.h>
# define NO_OF_CHARS 256
int Anagram(char *str1, char *str2)
{
    // Create two count arrays and initialize all values as 0
    int count1[NO_OF_CHARS] = {0};
    int count2[NO_OF_CHARS] = {0};
    int i;
    
    // For each character in input strings, increment count in
    // the corresponding count array
    for (i = 0; str1[i] && str2[i];  i++)
    {
        count1[str1[i]]++;
        count2[str2[i]]++;
    }
    
    // If both strings are of different length. Removing this condition
    // will make the program fail for strings like "aaca" and "aca"
    if (str1[i] || str2[i])
    return 0;
    
    // Compare count arrays
    for (i = 0; i < NO_OF_CHARS; i++)
    if (count1[i] != count2[i])
    return 0;

    return 1;
}
main()
{
    char str[100], str1[100];
    int flag = 0;
    
    printf("Enter first stringn");
    gets(str);
    
    printf("Enter second stringn");
    gets(str1);
    
    flag=Anagram(str, str1);
    if (flag==1)
    printf(""%s" and "%s" are anagrams.n", str, str1);
    else
    printf(""%s" and "%s" are not anagrams.n", str, str1);
    
    return 0;
}

Read more c programs
C Basic
C Strings

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link

C Program to check matrix is magic square or not

Posted on April 13, 2012September 6, 2017 by Sandeepa Nadahalli

Write a c program to check whether the given matrix is a magic square matrix or not.

A matrix is magic square matrix, if all rows sum, columns sum and diagonals sum are equal.

Example:
8   1 6
3   5   7
4   9 2

is the magic square matrix. As you can see numbers in first row add up to 15 (8 + 1 + 6), so do the numbers of 2nd row 3 + 5 + 7. Also the number in the last row 4 + 9 + 2. Similarly, the columns all add up to the same number 15. Hence, this matrix is a magic square matrix.

The Program

	#include <stdio.h>
	void main() {
	int A[50][50];
	int i, j, M, N;
	int size;
	int rowsum, columnsum, diagonalsum;
	int magic = 0;

	printf("Enter the order of the matrix:\n");
	scanf("%d %d", &M, &N);
	if(M==N) {
	printf("Enter the elements of matrix \n");
	for(i=0; i<M; i++) {
	for(j=0; j<N; j++) {
	scanf("%d", &A[i][j]);
	}
	}

	printf("\n\nMATRIX is\n");
	for(i=0; i<M; i++) {
	for(j=0; j<N; j++) {
	printf("%3d\t", A[i][j]);
	}
	printf("\n");
	}

	// calculate diagonal sum
	diagonalsum = 0;
	for(i=0; i<M; i++) {
	for(j=0; j<N; j++) {
	if(i==j) {
	diagonalsum = diagonalsum + A[i][j];
	}
	}
	}

	// calculate row sum
	for(i=0; i<M; i++) {
	rowsum = 0;
	for(j=0; j<N; j++) {
	rowsum = rowsum + A[i][j];
	}
	if(rowsum != diagonalsum) {
	printf("\nGiven matrix is not a magic square");
	return;
	}
	}

	// calculate column sum
	for(i=0; i<M; i++) {
	columnsum = 0;
	for(j=0; j<N; j++) {
	columnsum = columnsum + A[j][i];
	}
	if(columnsum != diagonalsum) {
	printf("\nGiven matrix is not a magic square");
	return;
	}
	}

	printf("\nGiven matrix is a magic square matrix");
	} else {
	printf("\n\nPlease enter the square matrix order(m=n) \n\n");
	}
	}

view raw magic_square.c hosted with ❤ by GitHub

Sample Output

Read more about C Programming Language and read the C Programming Language (2nd Edition). by K and R.

Related Programs

To get regular updates on new C programs, you can Follow @c_program
You can discuss these programs on our Facebook Page. Start a discussion right now,

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link

C Program to delete vowels in a string.

Posted on April 11, 2012 by Sandeepa Nadahalli

C Strings:
Write a C Program to delete a vowel in a given string.
In this program, We use the pointers to position the characters.check_vowel() function checks the character is vowel or not, if the character is vowel it returns true else false.
Example output:Given string: Check vowel
Output is: Chck vwl
Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<conio.h>
#define TRUE 1
#define FALSE 0

int check_vowel(char);

main()
{
    char string[100], *temp, *pointer, ch, *start;
    csrcscr();
    printf("nnEnter a stringn");
    scanf("%s",string);
    temp = string;
    pointer = (char*)malloc(100);
    
    if( pointer == NULL )
    {
        printf("Unable to allocate memory.n");
        exit(EXIT_FAILURE);
    }
    
    start = pointer;
    
    while(*temp)
    {
        ch = *temp;
        
        if ( !check_vowel(ch) )
        {
            *pointer = ch;
            pointer++;
        }
        temp++;
    }
    *pointer = '';
    
    pointer = start;
    strcpy(string, pointer); /* If you wish to convert original string */
    free(pointer);
    
    printf("String after removing vowels is "%s"n", string);
    
    return 0;
}

int check_vowel(char a)
{
    if ( a >= 'A' && a <= 'Z' )
    a = a + 'a' - 'A';
    
    if ( a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u')
    return TRUE;
    
    return FALSE;
}

Read more c programs
C Basic
C Strings

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link

C Program to delete a file.

Posted on April 6, 2012 by Sandeepa Nadahalli

Write a C Program to delete a file.
To delete a file in c, We use the remove macro, which is defined in stdio.h. remove macro takes filename with extension as its argument and deletes the file, if it is in the directory and returns the zero, if deleted successfully.
Note that deleted file does not goes to the recycle bin, it is going to delete permanently.
Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
#include<conio.h>
#include<process.h>
main()
{
    FILE *fp;
    char filename[20];
    int status;
    clrscr();
    printf("nEnter the file name:nn");
    scanf("%s",filename);
    
    fp = fopen(filename, r);
    
    if(fp == NULL)
    {
        printf("Error:  file not found! check the directory!!nn");
        exit(0);
    }
    fclose(fp);
    status = remove(file_name);
    
    if( status == 0 )
    printf("%s file deleted successfully.n",file_name);
    else
    {
        printf("Unable to delete the filen");
        perror("Error");
    }
    
    return 0;
}

Read more Similar C Programs
C Basic

C File i/o

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link

C Program to demonstrate strspn function.

Posted on April 4, 2012 by Sandeepa Nadahalli

Write a C Program to demonstrate strspn function.
The strspn() function returns the index of the first character in string1 that doesn’t match any character in string2. If all the characters of the string2 matched with the string1, strspn returns the length of the string1. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
#include<string.h>
#include<conio.h>
int main()
{
    int spn;
    char str1[] = "1234hjbcde09i";
    char str2[] = "12345";
    char str3[] = "a12d3456fd";
    char char_list[] = "1234567890";
    clrscr();
    //It returns 4
    spn = strspn (str1,char_list);
    printf ("nnThe length of the initial numbers for str1 is %d.n",spn);
    
    //It returns 5
    spn = strspn (str2,char_list);
    printf ("nThe length of the initial numbers for str2 is %d.n",spn);
    
    //It returns 0
    spn = strspn (string3,char_list);
    printf ("nThe length of the initial numbers for string3 is %d.n",spn);
    return 0;
}

Read more c programs
C Basic
C Strings

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link

C program to demonstrate ceil function.

Posted on April 3, 2012 by Sandeepa Nadahalli

Write a C program to demonstrate ceil function.ceil is in the C math.h library.
ceil function rounds up the smallest next integral value.
Example:ceil(2.0) is 2.0
ceil(2.1) is 3.0
ceil(2.2) is 3.0
—
—
ceil(2.9) is 3.0
Read more about C Programming Language.

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/




#include<stdio.h>
#include<math.h>
#include<conio.h>
int main()
{
    double number, result;
    clrscr();
    printf("Enter a number to round it upn");
    scanf("%lf",&number);
    
    result = ceil(number);
    
    printf("nOriginal number =  %lfn", number);
    printf("nNumber rounded up = %lfn", result);
    getch();
    return 0;
}

Read more Similar C Programs
Learn C Programming

Number System

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link

C program to draw a circle using c graphics.

Posted on April 3, 2012 by Sandeepa Nadahalli

Write C program to draw a circle using c graphics.
In this program we use the graphics.h library function to draw a circle. To use graphics.h, we have to install the drivers in to the the system by using the initgraph() function. In the program circle is the graphic function , which takes three parameters, first two are co-ordinates and the third one is the radius of the circle. Read more about C Programming Language.

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include <graphics.h>

main()
{
    int gd = DETECT, gm;
    initgraph(&gd, &gm, "C:\TC\BGI");
    
    circle(25, 25, 100);
    
    getch();
    closegraph();
    return 0;
}

Read more Similar C Programs
Learn C Programming

Number System

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link

C Program Examples

c example program

C program to implement SJF algorithm.

K & R C Chapter 5 Exercise Solutions.

C Program to demonstrate modf function.

C Program to check whether two strings are anagrams of each other.

C Program to check matrix is magic square or not

The Program

Sample Output

Related Programs

C Program to delete vowels in a string.

C Program to delete a file.

C Program to demonstrate strspn function.

C program to demonstrate ceil function.

C program to draw a circle using c graphics.