C++编程题

1、不用系统提供的字符串转int的功能,将一个字符串转换为对应的值

#include <iostream>
using namespace std;

static int StringToInt(string s)
{
	int sum;
	for(int i=0;i<s.length();i++)
	{
		sum = sum * 10 + (s[i]-‘0‘);
	}
	return sum;
}

int main() {
	cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!
	int sum;
	string s = "hello";
	sum = StringToInt(s);
	cout<<sum<<endl;
	return 0;
}