学英语

来源：互联网发布：咖啡机知乎编辑：程序博客网时间：2024/04/30 14:42

知识点：字符串，控制流（条件控制）。

思路：从本质上分析问题，从人思考问题的角度出发。需对不同大小的数字按不同的情况分类，给予不同的处理方法。

#include <iostream>#include <string>using namespace std;string s1[20] = { "one", "two" , "three", "four", "five" , "six", "seven", "eight" , "nine","ten" ,"eleven", "twelve", "thirteen" , "fourteen", "fifteen","sixteen" ,"seventeen", "eighteen", "nineteen" };//string s2[10] = {"ten","eleven","twelve", "thirteen", "fourteen","fifteen","sixteen","seventeen", "eighteen", "nineteen"};string s3[10] ={ "twenty", "thirty" , "forty", "fifty", "sixty" , "seventy", "eighty", "ninety" };string lessThan100( long num){string result;if(num < 20)result = s1[num-1];else if (num <100 && num%10 == 0 )result = s3[num/10-2];else if (num <100)result = s3[num/10-2]+ " "+s1[num%10-1];return result;}string lessThan1000( long num){string result;if(num < 100)result = lessThan100(num);else if(num%100 == 0)result = s1[num/100-1] + " hundred";elseresult = (s1[num/100 -1]+ " hundred and "+ lessThan100(num%100));return result;}string lessThanMillion( long num){string result;if(num < 1000)result = lessThan1000(num);else if(num % 1000 == 0)result = lessThan1000(num/1000) + " thousand";elseresult = lessThan1000(num/1000) + " thousand "+ lessThan1000(num%1000);return result;}string lessThanBillion( long num){ string result; if(num <1000000)result = lessThanMillion(num); else if(num % 1000000 ==0) result = lessThanMillion(num/1000000) + " million"; else result = lessThanMillion(num/1000000) + " million " + lessThanMillion(num%1000000);return result;}string parse(long num){string result;if(num <= 0 || num >=10000000000)result = "ERROR";else if(num < 1000)result = lessThan1000(num);else if(num < 1000000)result = lessThanMillion(num);else if(num <1000000000)result = lessThanBillion(num);else if (num == 1000000000)result = "one billion";elseresult = s1[num/1000000000-1]+ " billion "+ lessThanBillion(num%1000000000);return result;}int main(){long num =0 ;cin >> num;cout << parse(num);return 0;}

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