# 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>