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P. 79
return;
}
Let us now call the function swap() by passing values by reference as in the following
example:
#include <stdio.h>
/* function declaration */
void swap(int *x, int *y);
int main ()
{
/* local variable definition */
int a = 100;
int b = 200;
printf("Before swap, value of a : %d\n", a );
printf("Before swap, value of b : %d\n", b );
/* calling a function to swap the values.
* &a indicates pointer to a i.e. address of variable a and
* &b indicates pointer to b i.e. address of variable b.
*/
swap(&a, &b);
printf("After swap, value of a : %d\n", a );
printf("After swap, value of b : %d\n", b );
return 0;
}
Let us put the above code in a single C file, compile and execute it, to produce the
following result:
Before swap, value of a :100
Before swap, value of b :200
82
