学英语

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#include <iostream>#include <string>using namespace std;string NUmberToEnglishString(long int number){string s;if(number<0){s="error";return s;}if(number<20){switch (number){case 0:s="zero";return s;case 1:s="one";return s;case 2:s="two";return s;case 3:s="three";return s;case 4:s="four";return s;case 5:s="five";return s;case 6:s="six";return s;case 7:s="seven";return s;case 8:s="eight";return s;case 9:s="nine";return s;case 10:s="ten";return s;case 11:s="eleven";return s;case 12:s="twelve";return s;case 13:s="thirteen";return s;case 14:s="fourteen";return s;case 15:s="fifteen";return s;case 16:s="sixteen";return s;case 17:s="seventeen";return s;case 18:s="eighteen";return s;case 19:s="nineteen";return s;default:s="error";return s;}}if(number<100)   //21-99{if (number % 10 == 0) //20,30,40,...90的输出{switch (number){case 20:s="twenty";return s;case 30:s="thirty";return s;case 40:s="forty";return s;case 50:s="fifty";return s;case 60:s="sixty";return s;case 70:s="seventy";return s;case 80:s="eighty";return s;case 90:s="ninety";return s;default:s="error";return s;}}else{s=NUmberToEnglishString(number/10*10)+' '+NUmberToEnglishString(number%10);return s;}}if(number<1000)  //100-999{if(number%100==0){s=NUmberToEnglishString(number/100)+" hundred";return s;}else{s=NUmberToEnglishString(number/100)+" hundred and "+NUmberToEnglishString(number%100);return s;}}if(number<1000000)  //1000-999999   百万以下{if(number%1000==0){s=NUmberToEnglishString(number/1000)+" thousand";return s;}else{s=NUmberToEnglishString(number/1000)+" thousand "+NUmberToEnglishString(number%1000);return s;}}if(number<1000000000)   //十亿以下{if(number%1000000==0){s=NUmberToEnglishString(number/1000000)+" million";return s;}else{s=NUmberToEnglishString(number/1000000)+" million "+NUmberToEnglishString(number%1000000);return s;}}if (number<9999999999)  //十亿到99亿{if(number%1000000000==0){s=NUmberToEnglishString(number/1000000000)+" billion";return s;}else{s=NUmberToEnglishString(number/1000000000)+" billion "+NUmberToEnglishString(number%1000000000);return s;}}if (number>9999999999){s="error";return s;}}int main(){long int a;    while(cin>>a)        {cout<<NUmberToEnglishString(a)<<endl;            }}
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