TopCoder SRM 144 DIV2(200-point)

Problem Statement

 Computers tend to store dates and times as single numbers which represent the number of seconds or milliseconds since a particular date. Your task in this problem is to write a method whatTime, which takes an int,seconds, representing the number of seconds since midnight on some day, and returns a string formatted as "<H>:<M>:<S>". Here, <H> represents the number of complete hours since midnight, <M> represents the number of complete minutes since the last complete hour ended, and <S> represents the number of seconds since the last complete minute ended. Each of <H>, <M>, and <S> should be an integer, with no extra leading 0's. Thus, ifseconds is 0, you should return "0:0:0", while if seconds is 3661, you should return "1:1:1".

Definition

 Class:TimeMethod:whatTimeParameters:intReturns:stringMethod signature:string whatTime(int seconds)(be sure your method is public)

Limits

 Time limit (s):2.000Memory limit (MB):64

Constraints

-seconds will be between 0 and 24*60*60 - 1 = 86399, inclusive.

Examples

0)  

0

Returns: "0:0:0"

 1)  

3661

Returns: "1:1:1"

 2)  

5436

Returns: "1:30:36"

 3)  

86399

Returns: "23:59:59"

 

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解析：

纯粹的秒数换算为时间的题目，只需要几个取模就可以了！

但是这是第一次用C++类来做题目，还是发现自己有很多不会的东西，就算是给自己学习添加动力吧！

而且，在topcoder上只需要将头文件和类提交，便可以了 所以主函数不用提交的！！！

代码：

#include <cstdio>#include <cstdlib>#include <iostream>using namespace std;class Time{    public:    string whatTime(int second){        int h = second/3600;        int m = second/60%60;        int s = second%60;        char str[64];        sprintf(str, "%d:%d:%d", h,m,s);        string ret = str;        return ret;    }};/*int main(){    Time time;    int second;    cin >> second;    cout << time.whatTime(second) << endl;    return 0;}*/