使用模数运算符将秒转换为分钟和秒：％

#include <stdio.h>

#define SEC_PER_MIN 60            // seconds in a minute

int main(voID){
    int sec, min, left;

    printf("Enter the number of seconds (<=0 to quit):\n");
    scanf("%d", &sec);            
    while (sec > 0)
    {
        min = sec / SEC_PER_MIN;  // truncated number of minutes
        left = sec % SEC_PER_MIN; // number of seconds left over
        printf("%d seconds is %d minutes, %d seconds.\n", sec, min, left);
        printf("Enter next value (<=0 to quit):\n");
        scanf("%d", &sec);
    }
    printf("Done!\n");

    return 0;
}