Call by reference in C by R4R Team

Call by reference:
-Here call by reference means we call a function and pass variable reference instead of variable value.
-Pointer are used in such kind of calling.


program-

#include< stdio.h>
int func(int *a, int *b)
{
int t;
t=*a;
*a=*b;
*b=t;
}
int main() {
int i,j;
printf("Enter two numbers\n");
scanf("%d%d",&i,&j);
printf("Before function calling\");
printf("%d %d",i,j);
func(&i,&j);
printf("After function calling");
printf("%d %d",i,j);

}

output-

Enter two number
3 4
Before function calling
3 4
After function calling
4 3

-In this program, we take an input of two integer number and display them before function calling.
-Pass these number in function with variable reference.
-Function swap the new variable inside it but you can see the change in actual values also, so this kind of function calling is known as call by refrence.