C及C++编译时候出现的一些问题与解决方案

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C及C++编译时候出现的一些问题与解决方案

字符串问题

  • [no matching function for call to ‘std::basic_ofstream >::basic_ofstream(std::string&)’]
    编译时候报错为no matching function for call to std::basic_ofstream<char, std::char_traits >::basic_ofstream(std::string&)

    原因是C++的string类与C的字符串存在不同，一些函数无法将string类作为参数使用。

    std::ofstream can only be constructed with a std::string if you have C++11 or higher. Typically that is done with -std=c++11 (gcc, clang). If you do not have access to c++11 then you can use the c_str() function of std::string to pass a const char * to the ofstream constructor.

    解决方案：转换为C的字符串

    1.

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    char filename[10];  
    strcpy(filename, "1.txt");  
    ifstream fin;  
    fin.open(filename);

    2.

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    using namespace std;

    int main()
    { 
        string asegurado;
        cout << "Nombre a agregar: ";
        cin >> asegurado;

        ofstream entrada(asegurado,"");/*编译报错*/
        //ofstream entrada(asegurado); // C++11 or higher
    	//ofstream entrada(asegurado.c_str());  // C++03 or below
        if (entrada.fail())
        {
            cout << "El archivo no se creo correctamente" << endl;
        }
    }