题解 | #定义变量#

#include <iostream>
using namespace std;

int main() {

    char ch;
    int num;
    long lon;
    double doub;
    cout << sizeof(ch) << endl;
    cout << sizeof(num) << endl;
    cout << sizeof(lon) << endl;
    cout << sizeof(doub) << endl;
    

    return 0;
}