/*
 * ex6.c
 */
#include <stdio.h>
int main()
{
    int n ;

    printf("Enter a two-digit integer: ");
    scanf("%d", &n);
    if(n < 10 || n >= 100) printf("Wrong data: %d\n", n);
    else printf("%d --> %d\n", n, 10*(n%10)+n/10);
    return 0;
} // mn --> nm  ex6.c