Objects on C++

Question

How to add objects to a C++ Program

Answer 1

#include <iostream>

// Blueprint(class)
class foo {
public:
// foo's constructor
foo(int x) : test(x) { std::cout << "foo has constructed!\n"; }

// A simple member function
int mul();

// foo's destructor
~foo() { std::cout << "\nfoo has destroyed!\n"; }
private:

// data member
int test;
};

// function definition outside the class
int foo::mul() { return test * test; }

int main() {

// An arbitrary integer variable
int dummy = 30;

// instanciating f1 object out of foo class
foo f1(dummy);

// print out dummy's value
std::cout << "dummy is " << dummy << std::endl;

// calling member function using newly instantiated object
// and print out its result
std::cout << "Square of dummy is " << f1.mul();
}

Output:

foo has constructed!
dummy is 30
Square of dummy is 900
foo has destroyed!

[http://cpp.sh/9irfz]