4

#include<stdio.h>
int main()
{
    int x,y,temp;
    printf("First number is:\n");
    scanf("%d",&x);
    printf("Second number is:\n");
    scanf("%d",&y);

    temp=x;
    x=y;
    y=temp;

    printf("num1:%d\n",x);
    printf("num2:%d\n",y);

    return 0;

}