请问各位大佬这个代码char那里报错应该怎么该？

#include<iostream>
#include<string>
using namespace std;
int strtoint(const string &str)
{
	int num = 0;
	for (unsigned int i = 0; i < str.length(); i++)
	{
		if ((str.at(i) >= '0') && (str.at(i) <= '9'))
		{
			num = num * 10 + str.at(i) - '0';
		}
		else
		{
			throw str.at(i);
		}
	}
	return num;
}
int main()
{
	string str;
	int i_value;
	cout << "please input a number string :\n";
	cin >> str;
	try
	{
		i_value = strtoint(str);
		if (i_value > 10000)
			throw i_value;
	}
	catch (char)
	{
		cout << "input string include illegal character:" <<char<< endl;
		i_value = -1;
	}
	catch (int)
	{
		cout << "number is too big:" << i_value << endl;
	}
	cout << i_value << endl;
	return 0;
}

	catch (char c)
	{
		cout << "input string include illegal character:" << c << endl;
		i_value = -1;
	}
	catch (int i_value)
	{
		cout << "number is too big:" << i_value << endl;
	}

这么改试试

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