#include <iostream> using namespace std; int main(){int t;cin >> t;int h = t / 3600; //先算t秒得到h小时t -= h * 3600; //减去h小时的秒数int m = t / 60; //再算t秒得到的m分钟t -= m * 60; //减去m分钟的秒数printf("%d:%d:%d",h,m,t); //格式化输出//cout << h << ":" << m << ":" << t << endl; cout的输出方法 return 0; }