Problem 45 What Time Is It

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博客围绕将数字形式的时间转换成文字形式的问题展开，指出所有规则已给出，编码时需全面考虑，避免遗漏情况。

这个问题是要求把数字形式的时间转换成文字形式的。所有的regulation都给出了，编码的时候小心一点考虑全面就是了。

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main(){

string exp;

int hr, min;
char dump;
ifstream fin("clock.in");
fin>>hr>>dump>>min;

string hour[] = {"one", "two", "three", "four",
"five","six", "seven", "eight",
"nine","ten", "eleven","twelve"};

string minute[] = {" o'clock", "one", "two", "three",
        "four", "five","six", "seven",
        "eight", "nine", "ten", "eleven",
        "twelve", "thirteen", "fourteen",
        "fifteen","sixteen", "seventeen",
        "eighteen","nineteen"};

string key[] = {"twenty", "thirty", "forty"};

switch(min){
  case 0:
   exp = hour[hr - 1] + minute[min];
   break;
  case 15:
   exp = "quarter past " + hour[hr - 1];
   break;
  case 30:
   exp = hour[hr - 1] + " thirty";
   break;
  case 45:
   exp = "quarter to " + hour[hr % 12];
   break;
  default:
   if(min < 20) exp = hour[hr - 1] + " " + minute[min];
   else if(min > 45)
    exp = minute[60 - min] + " to " + hour[hr % 12];
   else{
    exp = hour[hr - 1] + " " + key[min / 10 - 2];
    if(min % 10) exp = exp + "-" + minute[min % 10];
   }
   break;
}

// ASCII code: 'A' = 65, 'a' = 97
exp[0] = exp[0] - (97 - 65);
ofstream fout("clock.out");
fout<<exp<<endl;
}