C Function Of Reference

Program for C function

#include

#include

float square ( float x );                               

int main( )               

{

        float m, n ;

        clrscr();

        printf ( "\nEnter some number for finding square \n");

        scanf ( "%f", &m ) ;

        n = square ( m ) ;                      

        printf ( "\nSquare of the given number %f is %f",m,n );

}

float square ( float x )   

{

        float p ;

        p = x * x ;

        return ( p ) ;

}

Output

Enter some number for finding square

2

Square of the given number 2.000000 is 4.000000

Program for C function

#include

#include

void swap(int a, int b);          

int main()

{

    int m = 22, n = 44;

    clrscr();

    printf(" values before swap  m = %d \nand n = %d", m, n);

    swap(m, n);                         

}

void swap(int a, int b)

{ 

    int tmp;

    tmp = a;

    a = b;

    b = tmp;

    printf(" \nvalues after swap m = %d\n and n = %d", a, b);

    getch();

}

Output

values before swap m = 22
and n = 44
values after swap m = 44
and n = 22

Program for C function using call by reference

#include

#include

void swap(int *a, int *b); 

int main()

{

    int m = 22, n = 44;

    printf("values before swap m = %d \n and n = %d",m,n);

    swap(&m, &n);         

}

void swap(int *a, int *b)

{

    int tmp;

    tmp = *a;

    *a = *b;

    *b = tmp;

    printf("\n values after swap a = %d \nand b = %d", *a, *b);

}

Output

values before swap m = 22 

and n = 44
values after swap a = 44
and b = 22

Program for memset() function in C

#include 

#include

#include 

#include 

int main()

{

   int i;

   char *a = (char *) malloc(5*sizeof(char));

   printf("Values before memset\n");

   for (i = 0; i < 5; ++i)

       printf("  a[%d] = %d ,", i,    a[i]);

   memset(a, 3, 5*sizeof(char));

      printf("\nValues after memset\n");

   for (i = 0; i < 5; ++i)

       printf("  a[%d] = %d ,", i,    a[i]);

      free(a);

   return 0;

}

 Output

Values before memset
a[0] = 0 , a[1] = 0 , a[2] = 0 , a[3] = 0 , a[4] = 0
Values after memset
a[0] = 3 , a[1] = 3 , a[2] = 3 , a[3] = 3 , a[4] = 3