pr27006.cpp

来自「c++编程宝典源码及Quincy99编译器 是《标准C++编程宝典》电子工业出」· C++ 代码 · 共 32 行

////////////////////////////////////////
// File Name: pr27006.cpp
////////////////////////////////////////
#include <typeinfo>
#include <iostream>

// Declare a class.
class Control { };

////////////////////////////////////////
// The main() function.
////////////////////////////////////////
int main()
{
    // Display name of type.
    Control ct;
    std::cout << "ct is a " << typeid(ct).name() << std::endl;

    // Compare typeids and display type of expression.
    double counter = 1.23;
    if (typeid(counter) != typeid(Control))
        std::cout << "counter is not a "
                  << typeid(Control).name()
                  << std::endl;
    if (typeid(counter) == typeid(1.23))
        std::cout << "counter is a double" << std::endl;
    if (typeid(counter) != typeid(int))
        std::cout << "counter is not an int" << std::endl;

    return 0;
}