如果printf()缺少参数怎么办？

#include <stdio.h>
int main(void)
{
    int ten = 10;
    int two = 2;// 

    printf("Doing it right: ");
    printf("%d minus %d is %d/n", ten, 2, ten - two );
    printf("Doing it wrong: ");
    printf("%d minus %d is %d/n", ten );  // forgot 2 arguments

    return 0;
}