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Call by value in User-defined Functions of Programming in C
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Call by value 
Passing some arguments to a function using primitive datatypes, it is known as call by value. It is not 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 = 10;B = 20
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