C Program to solve the producer consumer problem

Write a C Program to solve the producer consumer problem with two processes using semaphores.
Producer-consumer problem is the standard example of multiple process synchronization problem. The problem occurs when concurrently producer and consumer tries to fill the data and pick the data when it is full or empty. producer consumer problem is also known as bounded-buffer problem. In this program We use the semaphores, to solve the problem.Read more about C Programming Language . and read the C Programming Language (2nd Edition) by K and R.

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* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
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*
* Happy Coding
***********************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>


#define NUM_LOOPS 20
int main(int argc, char* argv[])
{
int sem_set_id;
union semun sem_val;
int child_pid;
int i;
struct sembuf sem_op;
int rc;
struct timespec delay;


sem_set_id = semget(IPC_PRIVATE, 1, 0600);
if (sem_set_id == -1) {
perror("main: semget");
exit(1);
}
printf("Semaphore set created,
semaphore set id '%d'.n", sem_set_id);


sem_val.val = 0;
rc = semctl(sem_set_id, 0, SETVAL, sem_val);
child_pid = fork();
switch (child_pid) {
case -1:
perror("fork");
exit(1);
case 0:
for (i=0; i<NUM_LOOPS; i++) {
sem_op.sem_num = 0;
sem_op.sem_op = -1;
sem_op.sem_flg = 0;
semop(sem_set_id, &sem_op, 1);
printf("consumer: '%d'n", i);
fflush(stdout);
sleep(3);
}
break;
default:
for (i=0; i<NUM_LOOPS; i++)
{
printf("producer: '%d'n", i);
fflush(stdout);
sem_op.sem_num = 0;
sem_op.sem_op = 1;
sem_op.sem_flg = 0;
semop(sem_set_id, &sem_op, 1);
sleep(2);
if (rand() > 3*(RAND_MAX/4))
{
delay.tv_sec = 0;
delay.tv_nsec = 10;
nanosleep(&delay, NULL);
}
}
break;
}


return 0;
}
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C Program to check whether two strings are anagrams of each other.

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.

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* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
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* 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;
}

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C Program to check matrix is magic square or not

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.

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C Program to delete vowels in a string.

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.

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* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
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* 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;
}
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C Program to delete a file.

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.

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* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact i[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;
}
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C program to demonstrate ceil function.

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.

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* programs for commercial purposes,
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*
* 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;
}
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C Program to compute the difference between two dates.

Write a C program to compute the difference between two dates.In this C Program, We check the date is valid or not and then calculating the No. of days of first date and second date from Jan 1 of first date, then subtract the smaller date from another. Read more about C Programming Language .

/***********************************************************
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* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
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* and browse!
*
* Happy Coding
***********************************************************/

#include<stdio.h>
#include<math.h>
#include<conio.h>
void main()
{
int day1,mon1,year1,day2,mon2,year2;
int ref,dd1,dd2,i;
clrscr();
printf("Enter first date day, month, yearn");
scanf("%d%d%d",&day1,&mon1,&year1);
printf("Enter second date day, month, yearn");
scanf("%d%d%d",&day2,&mon2,&year2);
ref = year1;
if(year2<year1)
ref = year2;
dd1=0;
dd1=dater(mon1);
for(i=ref;i<year1;i++)
{
if(i%4==0)
dd1+=1;
}
dd1=dd1+day1+(year1-ref)*365;
dd2=0;
for(i=ref;i<year2;i++)
{
if(i%4==0)
dd2+=1;
}
dd2=dater(mon2)+dd2+day2+((year2-ref)*365);
printf("nn Difference between the two dates is %d days",abs(dd2-dd1));

getch();
}




int dater(x)
{ int y=0;
switch(x)
{
case 1: y=0; break;
case 2: y=31; break;
case 3: y=59; break;
case 4: y=90; break;
case 5: y=120;break;
case 6: y=151; break;
case 7: y=181; break;
case 8: y=212; break;
case 9: y=243; break;
case 10:y=273; break;
case 11:y=304; break;
case 12:y=334; break;
default: printf("Invalid Inputnnnn"); exit(1);
}
return(y);
}

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C program to replace the sub string with another string.

C Strings:
Write a C program to replace the sub string in a string with another string.
In this program, We replace string with another string, if the entered string is the sub string of main string, otherwise function replace_str returns the original string as it is. Read more about C Programming Language .

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* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
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* and browse!
*
* Happy Coding
***********************************************************/

#include <stdio.h>
#include <string.h>

char *replace_str(char *str, char *orig, char *rep)
{
static char buffer[4096];
char *p;

if(!(p = strstr(str, orig)))
return str;

strncpy(buffer, str, p-str);
buffer[p-str] = '';

sprintf(buffer+(p-str), "%s%s", rep, p+strlen(orig));

return buffer;
}

int main(void)
{
char str[100],str1[50],str2[50];
printf("Enter a one line string..n");
gets(str);
printf("Enter the sub string to be replaced..n");
gets(str1);
printf("Enter the replacing string....n");
gets(str2);
puts(replace_str(str, str1, str2));

return 0;
}
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C Program to find all the permutations of a given string.

Write a c program to find all the permutations of a given string.
Example: If the given string is sam, output is,
sam
sma
msa
mas
asm
ams.
Read more about C Programming Language .

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* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
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*
* Happy Coding
***********************************************************/

# include<stdio.h>
# include<conio.h>
#include<string.h>
void swap (char *x, char *y)
{
char temp;
temp = *x;
*x = *y;
*y = temp;
}

void permute(char *a, int i, int n)
{
int j;
if (i == n)
printf("%sn", a);
else
{
for (j = i; j <= n; j++)
{
swap((a+i), (a+j));
permute(a, i+1, n);
swap((a+i), (a+j));
}
}
}


int main()
{
char str[80] ;
int len=0,i;
puts("Enter a string:nn");
gets(str);
for (i=0; str[i] != ''; i++)
{
len++;
}
permute(str, 0, len);
getchar();
return 0;
}
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C Program to implement Simpson method.

Write a C Program to implement Simpson method.
Simpson method is used for approximating integral of the function.
Simpson’s rule also corresponds to the 3-point Newton-Cotes quadrature rule.
In this program, We use the stack to implement the Simpson method. Read more about C Programming Language .

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* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
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*
* Happy Coding
***********************************************************/

#include<stdio.h>

#include<conio.h>

#include<math.h>

char post_fix[80];

float stack[80];

char stack1[80];

int top=-1,top1=-1;

float eval(char post_fix[], float x1);

void infix_post_fix(char infix[]);

main()

{

float x0, xn, h, s,e1,e2, e3;

char exp[80], arr[80];

int i,n,l=0;

clrscr();

printf("nEnter an expression: nn");

gets(exp);

puts("nnEnter x0, xn and number of sub-intervals: nn");

scanf("%f%f%d", &x0, &xn, &n);

h=(xn-x0)/n;

if(exp[0]=='l'&& exp[1]=='o'&& exp[2]=='g')

{

l=strlen(exp);

for(i=0;i<l-3; i++)

arr[0]=exp[i+3];

arr[i]=";

infix_post_fix(arr);

e1=eval(post_fix,x0);

e2=eval(post_fix,xn);

e3=4*eval(post_fix, x0+h);

s=log(e1)+log(e2)+log(e3);

for (i=3;i<=n-1;i+=2)

s+=4*eval(post_fix,x0+i*h)+2*eval(post_fix, x0+(i-1)*h);

}

else

{

infix_post_fix(exp);

s=eval(post_fix,x0)+eval(post_fix,xn)+4*eval(post_fix, x0+h);

for (i=3;i<=n-1;i+=2)

s+=4*eval(post_fix,x0+i*h)+2*eval(post_fix, x0+(i-1)*h);

}

printf("nnThe value of integral is %6.3fn",(h/3)*s);

return(0);

}

/*Inserting the operands in a stack. */

void push(float item)

{

if(top==99)

{

printf("ntThe stack is full");

getch();

exit(0);

}

else

{

top++;

stack[top]=item;

}

return;

}

/*Removing the operands from a stack. */

float pop()

{

float item;

if(top==-1)

{

printf("ntThe stack is emptynt");

getch();

}

item=stack[top];

top–;

return (item);

}

void push1(char item)

{

if(top1==79)

{

printf("ntThe stack is full");

getch();

exit(0);

}

else

{

top1++;

stack1[top1]=item;

}

return;

}

/*Removing the operands from a stack. */

char pop1()

{

char item;

if(top1==-1)

{

printf("ntThe stack1 is emptynt");

getch();

}

item=stack1[top1];

top1–-;

return (item);

}

/*Converting an infix expression to a postfix expression. */

void infix_post_fix(char infix[])

{

int i=0,j=0,k;

char ch;

char token;

for(i=0;i<79;i++)

post_fix[i]=' ';

push1('?');

i=0;

token=infix[i];

while(token!=")

{

if(isalnum(token))

{

post_fix[j]=token;

j++;

}

else if(token=='(')

{

push1('(');

}

else if(token==')')

{

while(stack1[top1]!='(')

{

ch=pop1();

post_fix[j]=ch;

j++;

}

ch=pop1();

}

else

{

while(ISPriority(stack1[top1])>=ICP(token))

{

ch=pop1();

post_fix[j]=ch;

j++;

}

push1(token);

}

i++;

token=infix[i];

}

while(top1!=0)

{

ch=pop1();

post_fix[j]=ch;

j++;

}

post_fix[j]=";

}

/*Determining the priority of elements that are placed inside the stack. */

int ISPriority(char token)

{

switch(token)

{

case '(':return (0);

case ')':return (9);

case '+':return (7);

case '-':return (7);

case '*':return (8);

case '/':return (8);

case '?':return (0);

default: printf("nnInvalid expression");

}

return 0;

}

/*Determining the priority of elements that are approaching towards the stack. */

int ICP(char token)

{

switch(token)

{

case '(':return (10);

case ')':return (9);

case '+':return (7);

case '-':return (7);

case '*':return (8);

case '/':return (8);

case ":return (0);

default: printf("nnInvalid expression");

}

return 0;

}

/*Calculating the result of expression, which is converted in postfix notation. */

float eval(char p[], float x1)

{

float t1,t2,k,r;

int i=0,l;

l=strlen(p);

while(i<l)

{

if(p[i]==’x')

push(x1);

else

if(isdigit(p[i]))

{

k=p[i]-'0′;

push(k);

}

else

{

t1=pop();

t2=pop();

switch(p[i])

{

case '+':k=t2+t1;

break;

case '-':k=t2-t1;

break;

case '*':k=t2*t1;

break;

case '/':k=t2/t1;

break;

default: printf("ntInvalid expression");

}

push(k);

}

i++;

}

if(top>0)

{

printf("You have entered the operands more than the operatorsnn");

exit(0);

}

else

{

r=pop();

return (r);

}

return 0;

}

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