C Program to demonstrate the ‘getchar’ function.

Posted on October 17, 2011 by Sandeepa Nadahalli

Program to demonstrate the getchar function. The program will read data entered via the keyboard. And returns the number of characters entered. 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>

#define RETURN 'n'   /* n == return in UNIX
        r == return in DOS  */

main()
{
 int count=0;
 puts("Please enter some text.");
 /* Count the letters in the 'stdin'
        buffer.   */
 while ( getchar() != RETURN) count++;

 printf("You entered %d charactersn", count);
}

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C Program to demonstrate the ‘fgets’ function.

Posted on October 17, 2011 by Sandeepa Nadahalli

Program to demonstrate the ‘fgets’ function. The program will count the number of lines in a file. This is a function of the UNIX command ‘wc’. 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>

#define LINE_LENGTH 80

main()
{
 FILE* fp;
 char line[LINE_LENGTH];
 int count=0;

 fp=fopen("/home/DOC/C/c.html","r");
 /* Count up the lines here. */
 while ( fgets(line, LINE_LENGTH, fp) != NULL) count++;

 printf("File contains %d lines.n", count);

 fclose(fp);
}

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C Program to check the given number is Armstrong or not?

Posted on October 14, 2011 by Sandeepa Nadahalli

C Program to check the given number is Armstrong number or not?. Armstrong number is a number that is the sum of its own digits each raised to the power of the number of digits. Example: 153 = 1^3 + 5^3 + 3^3. 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>
void main()
{
 int num,num1,arms=0,rem;

 printf("Enter the number:n");
 scanf("%d",&num);
 num1=num;
 while(num>0)
 {
  rem=num%10;
  arms=arms+rem*rem*rem;
  num=num/10;
 }
 if(num1==arms)
 {
  printf(" n%d is an Armstrong number",num1);
 }
 else
 {
  printf("n%d is NOT an Armstrong number",num1);
 }

}

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C Program to Demonstrate #if, #else & #endif preprocessors.

Posted on October 14, 2011 by Sandeepa Nadahalli

C Program to demonstrate the Preprocessor directives like #if, #else, #define, #endif. C Preprocessors are not the program statements, they are executed before the actual compilation of the code. C Preprocessors substitute the code where they called, i.e they replace the code as they defined. #if, #else are the conditional directives. Here at the compile time #if value is false, so #else part is execute.
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>

#define SWITCH 0

/* The #if can only perform 
 * INTEGER tests!!!!
 */
#if  ( SWITCH == 1 )
#define TEXT "Example to #if"
#else
#define TEXT "Example to # else"
#endif

main ()
{
 printf(TEXT);
}

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C program to find the character type.

Posted on October 14, 2011 by Sandeepa Nadahalli

C Program to find the Character types. Here we used the isdidit(), isalpa(), and isspace() functions.isdigit() function returns true if argument is a decimal digit, otherwise false. isalpa() function returns true if argument is a defined set of characters in c, otherwise false. isspace() function returns true if argument is a white space character (one of ‘ ‘ ‘f’ ‘n’ ‘r’ ‘t’ ‘v’), otherwise false. 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 <ctype.h>   

#define FALSE 0
#define TRUE  1

    /* function declarations   */
int char_type(char);

main()
   {
   char ch;
   /* get a character from the keyboard  */
   printf(" Please enter a charcater => ");
   ch = getc(stdin);

   char_type(ch); /* Figure out the character type  */
   }


int char_type(char ch)
   {
   /* returns non zero if A-Z or a-z  */
   if ( isalpha(ch) != FALSE)
      printf("%c is an Alpha character.n",ch);

   /* returns non zero if 0-9    */
   if ( isdigit(ch) != FALSE)
      printf("%c is a numeric character.n",ch);

   /* returns non zero if a space, CR, Tab, NL FF  */
   if ( isspace(ch) != FALSE)
      printf("%c is white spacen", ch);

   }

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C Program to demonstrate extern variable.

Posted on October 14, 2011 by Sandeepa Nadahalli

C Program to demonstrate extern variable. Extern variables are very useful in c,when the source code is in the two or more files, you can refer the variables from one file to another using extern variables. Extern variables are also global variable,but in explicit manner. 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>
void write_extern(void);

extern int count;

void write_extern(void) 
{
 printf("count is %in", count);
}

int count = 5;

main() 
{
 write_extern();
}

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C Program to demonstrate functions.

Posted on October 14, 2011 by Sandeepa Nadahalli

C Program to demonstrate functions. C Functions are block of codes, performs the specific task. Default function in C is main(). Advantages of the functions are easy to understand, coding, well defined tasks, easy error handling. There are several ways to call the functions like, pass by value, pass by reference etc.. 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>
int add( int, int);    /* Function declaration  */

main()
{
 int i=1;
 printf("i starts out life as %d.", i);

 i = add(1, 1);   /* Function call         */

 printf(" And becomes %d after function is executed.n", i);
}

/************************************************************************/

int add( int a, int b)    /* Function definition   */
{
 int c;
 c = a + b;
 return c;
}

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C Program to Find out the size of the different data types

Posted on October 14, 2011 by Sandeepa Nadahalli

C Program to find the Size of Different data types. In This program we, find the size of the datatypes in c using sizeof() operator. sizeof() operator returns the its argument memory in bytes. 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>
main()
{

 printf("    short int is %2d bytes n", sizeof(short int));
 printf("          int is %2d bytes n", sizeof(int));
 printf("        int * is %2d bytes n", sizeof(int *));
 printf("     long int is %2d bytes n", sizeof(long int));
 printf("   long int * is %2d bytes n", sizeof(long int *));
 printf("   signed int is %2d bytes n", sizeof(signed int));
 printf(" unsigned int is %2d bytes n", sizeof(unsigned int));
 printf("n");
 printf("        float is %2d bytes n", sizeof(float));
 printf("      float * is %2d bytes n", sizeof(float *));
 printf("       double is %2d bytes n", sizeof(double));
 printf("     double * is %2d bytes n", sizeof(double *));
 printf("  long double is %2d bytes n", sizeof(long double));
 printf("n");
 printf("  signed char is %2d bytes n", sizeof(signed char));
 printf("         char is %2d bytes n", sizeof(char));
 printf("       char * is %2d bytes n", sizeof(char *));
 printf("unsigned char is %2d bytes n", sizeof(unsigned char));
}

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C Program to Demonstrate getting the parameters from the command line.

Posted on October 14, 2011 by Sandeepa Nadahalli

C Program to getting the parameters from the command line. To pass the arguments from command line, in main function we have to declare two arguments . First one is number of arguments passed to the program and other one is pointer variable which gives the list of arguments passed. 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>

main(int argc, char *argv[]) {
 int count;

 /*  Main takes two variables 'argc' is the number of parms on the 
  *  command line and 'argv' is a pointer to each of the parameters.
  *
  * int argc    -- integer number called 'argc'
  * char *argv[] -- Character pointer array!
  */

 printf("%i parameters entered on the command line.n", argc);

 /*
  * progname  argc = 1
  * progname parm1 parm2 argc = 3
  */

 /* 
  * We take 1 from argc because 
  * the argv array starts at zero 
  * an ends at argc -1
  */

 for (count = 0; count <= argc - 1; count++) {
  /* printf expects a pointer 
   * to the text 
   */

  printf("parm %d is %sn", count, argv[count]);
 }
}

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C Program to implement the Newton- Gregory forward interpolation

Posted on October 14, 2011 by Sandeepa Nadahalli

C Program to implement the Newton- Gregory forward interpolation. Newtons – Gregory forward difference formula is a finite difference identity capable of giving an interpolated value between the tabulated points {fk} in terms of the first value f0 and powers of the forward difference Δ. In this program we used the multidimensional arrays and arrays in c. 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<conio.h>
#define MaxN 100
#define Order_of_diff 4

void main ()
{
 float arr_x[MaxN+1], arr_y[MaxN+1], numerator=1.0, denominator=1.0, x, y, p, h, diff_table[MaxN+1][Order_of_diff+1];
 int i,j,n,k;
 clrscr();

 printf("Enter the value of n n");
 scanf("%d",&n);
 printf("Enter the values of x and y");

 for(i=0; i<=n; i++)
  scanf("%f%f", &arr_x[i], &arr_y[i]);
 printf("Enter the value of x at which value of y is to be calculated");
 scanf("%f", &x);
 h=arr_x[1]-arr_x[0];

 for(i=0; i<=n-1; i++)
  diff_table[i][1]=arr_y[i+1]-arr_y[i];/*Creating the difference table and calculating first order differences*/
 for(j=2; j<=Order_of_diff; j++)/*Calculating higher order differences*/
  for(i=0; i<=n-j; i++)
   diff_table[i][j]=diff_table[i+1][j-1] - diff_table[i][j-1];
 i=0;

 while(!(arr_x[i]>x)) /* Finding x0 */
  i++;
 i--;
 p=(x-arr_x[i])/h;
 y=arr_y[i];

 for (k=1; k<=Order_of_diff; k++)
 {
  numerator *=p-k+1;
  denominator *=k;
  y +=(numerator/denominator)*diff_table[i][k];
 }
 printf("When x=%6.1f, y=%6.2fn",x, y);
 getch();
}

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