Answer to Question #188627 in C++ for zaid

Question

Q1: Write a Program in C++ which completes following requirements:

a. Create a class, having a static function printing some information and invoke that method using scope resolution operator.

b. Try to access non-static data members from static method and write in comments what happens.

c. Declare and initialize a static variable as counter in a function (increment it in every call) and call it multiple times printing the change in value

d. Write about your observations while making this assignment in a word file about static variables and static methods

Answer 1

a)

#include <iostream>
using namespace std;
class Class{
    public:
    Class(){}
    static void staticMethod(){
        cout<<"Some information";
    }
};
int main(){
    Class::staticMethod();
    return 0;
}

b)

#include <iostream>
using namespace std;
class Class{
    int x;
    public:
    Class(){}
    static void staticMethod(){
        cout<<x; //compilation error. A nonstatic member reference must be relative to a specific object
    }
};

c)

#include <iostream>
using namespace std;
int funcn(){
    static int x = 0;
    return ++x;
}
int main(){
    cout<<funcn()<<endl;
    cout<<funcn()<<endl;
    cout<<funcn()<<endl;
    return 0;
}

d)static class methods cannot use non-static data members

static variables retain their previous value in every function call.