C/code/datatype(数据类型)类（构造函数重载和调用）.cpp

#include <iostream>
#include <string>

class datatype {
public:
    datatype() {}
    
    void inputChar(char c) {
        std::cout << "character:" << c << std::endl;
    }

    void inputInt(int num) {
        std::cout << "int:" << num << std::endl;
    }

    void inputFloat(float f) {
        std::cout << "float:" << f << std::endl;
    }
};

int main() {
    int choice;
    std::cin >> choice;

    datatype obj;

    if (choice == 1) {
        int num;
        std::cin >> num;
        obj.inputInt(num);
    } else if (choice == 2) {
        char c;
        std::cin >> c;
        obj.inputChar(c);
    } else if (choice == 3) {
        float f;
        std::cin >> f;
        obj.inputFloat(f);
    }

    return 0;
}