【C++标准I/0库】错误：runtime_error was not declared

最新推荐文章于 2025-04-24 17:09:19 发布

原创最新推荐文章于 2025-04-24 17:09:19 发布

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#编译错误 #runtime_error #numeric_limits #stdexcept #limits

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# 编译出现：runtime_error was not declared

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


using namespace std;

std::istream& get(std::istream& in)
{
    //该函数应一直读取流
    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 << "输入的数据是：" << val << std::endl;
    }

    in.clear();

    return in;
}

int main()
{
    cout << "测试函数：" << endl;

    double d_val;

    //使用标准输入
    get(cin);

    cout << "使用cin输入一个double类型的数据：" << endl;
    cin >> d_val;
    cout << "输入的是：" << d_val << endl;

    return 0;
}

错误：

||=== 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)) ===|

解决方法：

加上头文件：#include <stdexcept>

拓展：若出现编译错误error: 'numeric_limits' is not a member of 'std'

加上头文件：#include <limits>