Ex.No:6b Swapping Two Numbers using call by value

AIM:

        To write a C program to swap two numbers using call by value.

ALGORITHM:

Step 1: Start the program.

Step 2: Set a ← 10 and b ← 20

Step 3: Call the function swap(a,b)

Step 3a: Start function.

Step 3b: Assign t ← x

Step 3c: Assign x ← y

Step 3d: Assign y ← t

Step 3e: Print x and y.

Step 3f: End function.

Step 4: Stop the program.

PROGRAM CODE:

#include<stdio.h>
#include<conio.h>
void swap(int , int);         // Declaration of function
void main( )
{
    int a = 10, b = 20 ;
    clrscr();
    printf("n  Before swapping");
    printf ( "n  a = %d b = %d", a, b ) ;
    swap(a,b);// call by value : a and b are actual parameters
    getch();
}
void swap( int x, int y ) // x and y are formal parameters
{
    int t ;
    t = x ;
    x = y ;
    y = t ;
    printf("n  After swapping");
    printf ( "n  a = %d b = %d", x, y ) ;
}
OUTPUT:

value

RESULT:

                    Thus the C program to swap two numbers using call by value is written and executed successfully.

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