c++如何查询变量的类型

使用typeid().name()查询：

需要添加头文件typeinfo

#include <iostream>
#include <typeinfo>
using namespace std;
int main()
{
    int a;
    char ch;
    char name[20];
    string str;
    double b;
    long c;
    long long d;
    bool e;
    cout << "The show of int is " << typeid(a).name() <<  endl;
    cout << "The show of char is " << typeid(ch).name() <<  endl;
    cout << "The show of char array is " << typeid(name).name() <<  endl;
    cout << "The show of string is " << typeid(str).name() <<  endl;
    cout << "The show of double is " << typeid(b).name() <<  endl;
    cout << "The show of long is " << typeid(c).name() <<  endl;
    cout << "The show of long long is " << typeid(d).name() <<  endl;
    cout << "The show of bool is " << typeid(e).name() <<  endl;
    return 0;
}

运行结果：