Swapping of two variables

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/*c-program to swap two numbers using two variables*/

#include<stdio.h>
#include<conio.h>

int main()
{
    int a,b;
    printf("Enter two numbers :");
    scanf("%d%d",&a,&b);
    printf("Before swapping..\n\n");
    printf("A=%d\nB=%d",a,b);
    a=a+b;
    b=a-b;
    a=a-b;
    printf("\n\nAfter swapping ...\n");
    printf("A=%d\nB=%d",a,b);
    getch();
}
output:-