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Call by reference in User-defined Functions of Programming in C
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Call by reference 
Passing some arguments to a function using pointer reference, it is known as call by reference. It is modifiable by the calling function.
Program
	#include
	void swap(int *,int *);
	void main(){
	   int a = 10;
	   int b = 20;
	   clrscr();
	   printf("Before\n");
	   printf("A = %d;B = %d\n",a,b);
	   swap(&a,&b);
	   printf("After\n");
	   printf("A = %d;B = %d\n",a,b);
	}
	void swap(int *x,int *y){
	   int tmp = *x;
	   *x = *y;
	   *y = tmp;
	    printf("After done swaping inside swap function\n");
	    printf("A = %d;B = %d\n",*x,*y);
	}
Output 
Before
A = 10;B = 20
After done swaping inside swap function
A = 20;B = 10
After
A = 20;B = 10
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