#include<iostream>
#include<math.h>
using namespace std;
class complex
{
	intreal,img;
	//intimg;
public:
		void read();
		void display();
		void addition(complex c2);
		voidsubstraction(complex c2);
		void multiplication(complex c2);
		void division(complex c2);
		 //void multiplication1(complex c3);
		void conjugate();
};
void complex::read()
{
	cout<<"ENTER REAL PART OF COMPLEX NO.";
	cin>>real;
	cout<<"ENTER IMAGINARY PART OF COMPLEX N0.";
	cin>>img;
}
void complex::display()
{
	if(img>0)
	{
		cout<<real<<"+"<<img<<"i"<<endl;
	}
	else
	{
		int i=-img;
		cout<<real<<"-"<<i<<"i"<<endl;
	}
}
void complex::addition(complex c2)
{
	complex sum;
	sum.real=real+c2.real;
	sum.img=img+c2.img;
	cout<<" ADDITION IS=";
	sum.display();
}
void complex::substraction(complex c2)
{
	complex sub;
	sub.real=real-c2.real;
	sub.img=img-c2.img;
	cout<<" SUBSTRACTION IS=";
	sub.display();
}
void complex::multiplication(complex c2)
{
	complex product;
	product.real=real*c2.real-img*c2.img;
	product.img=img*c2.real+real*c2.img;
	cout<<"\n MULTIPLICATION IS=";
product.display();
}
void complex::division(complex c2)
{
	floatdiv,r,i;
	div=(pow(c2.real,2)+pow(c2.img,2));
	complex c3,c4;
	c3.real=c2.real;
	c3.img=-c2.img;
//	c4=multiplication(c2);
	r=c4.real/div;
	i=c4.img/div;
	cout<<"\n DIVISION IS=";
	if(i>0)
	{
		cout<<r<<"+"<<i<<"i"<<endl;
	}
	else
	{
		int a=-i;
		cout<<r<<"-"<<a<<"i"<<endl;
	}
}
void complex::conjugate()
{
	complex c;
	c.real=real;
	c.img=-img;
	cout<<"\n COMPLEX CONJUGATE IS=";
	c.display();
}
int main()
{
	complex c1,c2;
	c1.read();
	c2.read();
	c1.display();
	c2.display();
	c1.addition(c2);
	c1.substraction(c2);
	c1.multiplication(c2);
	c1.division(c2);
	c1.conjugate();
	c2.conjugate();
}
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Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}