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Commit 431e30a

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understand 3 types of constructors
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  • Learn_CPP_Programming_Deep_Dive/Section 11 OOP/Constructors

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#include <iostream>
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using namespace std;
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class Rectangle
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{
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private:
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int length;
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int breadth;
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public:
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/* Accessors go here */
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int getLength()
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{
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return length;
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}
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int getBreadth()
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{
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return breadth;
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}
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/* Mutators go here */
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void setLength(int l)
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{
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if(l<0)
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{
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length = 0;
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}
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else
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{
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length = l;
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}
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}
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void setBreadth(int b)
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{
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if(b<0)
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{
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breadth = 0;
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}
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else
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{
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breadth = b;
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}
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}
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/* There are 4 types of constructors: 1. Compiler provided 2. no-parameterized 3. parameterized 4. copy constructor */
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Rectangle()
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{
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/* this is non parameterized constructor */
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length = 0;
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breadth = 0;
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}
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Rectangle(int l, int b)
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{
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/* this is a parameterized constructor */
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setLength(l);
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setBreadth(b);
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}
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Rectangle(Rectangle &r)
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{
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/* this is a copy constructor - i am providing a copy example */
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length = r.length;
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breadth = r.breadth;
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}
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int area()
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{
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return length * breadth;
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}
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};
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int main(void)
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{
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Rectangle r1;
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Rectangle r2(10,20);
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Rectangle r3(r2);
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cout<<"Area of non-parameterized rectangle is "<<r1.area()<<endl;
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cout<<"Area of non-parameterized rectangle is "<<r2.area()<<endl;
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cout<<"Area of non-parameterized rectangle is "<<r3.area()<<endl;
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return 0;
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}

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