c++ - system() 不在 for 循环 C++ 中工作

Question

我无法让 system() 在 c++ 的 for 循环中工作。这是我的代码的一个示例:

string modules[13] = {"requests", "pygame", "pronouncing",
                  "nltk", "pip", "webbrowser",
                  "uszipcode", "geopy", "Nominatim",
                  "bs4", "autocorrect", "spell",
                  "speechrecognition"};
int main() {
    for (int i = 0; i < 4; i++)
        system("sudo pip3 install " << modules[i]) // This is what raised the error.
}

我收到这个错误:

Documents/JoeInstaller.cpp:109:9: error: no matching function for call to 'system'
    system("sudo pip3 install " << modules[i])
    ^~~~~~

Answer 1

#include <string>
#include <cstdlib>

std::string modules[13] = {"requests", "pygame", "pronouncing",
              "nltk", "pip", "webbrowser",
              "uszipcode", "geopy", "Nominatim",
              "bs4", "autocorrect", "spell",
              "speechrecognition"};

int main() {
    std::string sudo("pip3 install ");
    for (int i = 0; i < 13; i++)
        std::system( (sudo + modules[i]).c_str() ); 
}

这是一种实现方式，System只有一个参数。

还要避免为每个操作要求密码，请使用 sudo 运行 C++ 程序。