天天看點

【C++标準I/0庫】錯誤:runtime_error was not declared

# 編譯出現:runtime_error was not declared

#include <iostream>
//#include <stdexcept>  //runtime_error


using namespace std;

std::istream& get(std::istream& in)
{
    //該函數應一直讀取流
    int val;

    while (in >> val, !in.eof()){
        if (in.bad()){
            throw runtime_error("IO stream error!");
        }
        if (in.fail()) {
            std::cerr << "Data error, try again." << std::endl;
            in.clear();
            in.ignore(200, '\n');
            continue;
        }
        std::cout << "輸入的資料是:" << val << std::endl;
    }

    in.clear();

    return in;
}

int main()
{
    cout << "測試函數:" << endl;

    double d_val;

    //使用标準輸入
    get(cin);

    cout << "使用cin輸入一個double類型的資料:" << endl;
    cin >> d_val;
    cout << "輸入的是:" << d_val << endl;

    return 0;
}
           

錯誤:

||=== Build: Debug in Demo6 (compiler: GNU GCC Compiler) ===|

G:\C_Code black\day0404\Demo6\main.cpp||In function 'std::istream& get(std::istream&)':|

G:\C_Code black\day0404\Demo6\main.cpp|14|error: 'runtime_error' was not declared in this scope|

||=== Build failed: 1 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ===|

解決方法:

加上頭檔案:#include <stdexcept>

拓展:若出現編譯錯誤error: 'numeric_limits' is not a member of 'std'

加上頭檔案:#include <limits>

繼續閱讀