要求const char *传递.

将其更改为:

int y = atoi(s.c_str());

或使用 std::stoi() ，您可以通过直接:

or use std::stoi() which you can pass a string directly:

int y = stoi(s);

您的程序还有其他几个错误.可行的代码可能类似于:

You program has several other errors. Workable code could be something like:

#include<iostream>
#include<string>
using namespace std;

int main()
{
    string s = "453";
    int y = atoi(s.c_str());
    // int y = stoi(s); // another method
}