很简单的模拟题啦
class Solution {
public:
string number1[20] = { "Zero","One","Two","Three","Four","Five","Six","Seven","Eight","Nine","Ten","Eleven","Twelve","Thirteen","Fourteen","Fifteen","Sixteen","Seventeen","Eighteen","Nineteen" };
string number3[10] = { "Twenty","Thirty","Forty","Fifty","Sixty","Seventy","Eighty","Ninety" };
string number4[10] = { "Hundred","","Thousand","Million","Billion" };
string numberToWords2(int num)
{
string ans = "";
int a = num / 100;
num %= 100;
int b = num / 10;
num %= 10;
int c = num;
if (a != 0)
{
ans += number1[a];
ans += " ";
ans += number4[0];
ans += " ";
}
if (b >= 2)
{
ans += number3[b - 2];
ans += " ";
}
else if (b == 1)
{
ans += number1[10 + c];
ans += " ";
ans = ans.substr(0, ans.size() - 1);
return ans;
}
if (c != 0)
{
ans += number1[c];
ans += " ";
}
ans = ans.substr(0, ans.size() - 1);
return ans;
}
string function(int num1,int num2,int pos)
{
string ans="";
int x = num1 / num2;
if (x != 0)
{
string y = numberToWords2(x);
ans += y;
ans += " ";
if(number4[pos]!="")
{
ans += number4[pos];
ans += " ";
}
}
return ans;
}
string numberToWords(int num) {
string ans = "";
int x = 1000000000;
for(int i=4;i>=1;i--)
{
ans += function(num,x,i);
num %= x;
x/=1000;
}
if (ans == "")
ans = "Zero";
if(ans[ans.size()-1]==' ')
ans = ans.substr(0, ans.size() - 1);
return ans;
}
};