C++ 字符处理

1、string转double

#include <iostream> #include <string>

#include <cstdlib> using namespace std;

int main() {

string s; cin >> s;

double n = atof(s.c_str());

cout << n << endl; return 0;

}

2、string转int

#include <iostream>

#include <string>

#include <cstdlib>

using namespace std;

int main() {

    string s;

    cin >> s;

    cout << atoi(s.c_str()) << endl;

    return 0;

}