华为oj_学英语_改

#include <iostream>#include <string>using namespace std;string s[]={"billion","million","thousand","hundred"};string s1[]={"zero","one","two","three","four","five","six","seven","eight","nine","ten","eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen"};string s2[]={"twenty","thirty","forty","fifty","sixty","seventy","eighty","ninety"};string c=" ";string parse3(int num){    string result;    int t;    int flag=0;    if(num>999)    {        t=num/1000;        result+=(s1[t]+c+s[2]);        flag=1;        num%=1000;    }    if(num>99)    {        t=num/100;        if(flag==1)            result+=c;        result+=(s1[t]+c+s[3]);        flag=1;        num%=100;    }    if(num>19)    {        t=num/10;        if(flag==1)            result+=" and ";        result+=s2[t-2];        t=num%10;        if(t!=0)            result+=c+s1[t];    }    else    {        if(flag==1&&num!=0)            result+=" and ";        if(num!=0)            result+=s1[num];    }    return result;}string parse(long int num){    string result;    int t;    int flag=0;    if(num>=1000000000)    {        t=num/1000000000;        result+=s1[t];        result+=c+s[0];        flag=1;        num%=1000000000;    }    if(num>=1000000)    {        if(flag==1)            result+=c;        t=num/1000000;        result+=parse3(t);        result+=c+s[1];        flag=1;        num%=1000000;    }    if(num>=1000)    {        if(flag==1)            result+=c;        t=num/1000;        result+=parse3(t);        result+=c+s[2];        flag=1;        num%=1000;    }    if(num>0)    {        if(flag==1)            result+=c;        result+=parse3(num);    }    return result;}int main(){    long int num;    while(cin>>num)    {        if(num>=10000000000||num<=0)            cout<<"error"<<endl;        else            cout<<parse(num)<<endl;    }    return 0;}

之前的有错误是因为十亿、百万、千后面不需要加and。