#include<stdio.h>

int main(){
        int a,b;
        printf("Saisis variable n°1: ");
        scanf("%d",&a);

        printf("Saisis variable n°2: ");
        scanf("%d",&b);

        a= a+b;
        b= a-b;
        a= a-b;

        printf("variable 1 vaut maintenant %d et variable 2 vaut %d !\n", a, b);
}