c++ program for complex numbers using class

C++ class for addition, subtraction, multiplication and division for complex numbers. 

Class has four functions to perform arithmetic operations. It takes two complex numbers input from user real and imaginary parts separately.

The double data type is used to perform all operations. Code tested using c++ CodeBlocks IDE.

#include <iostream>
using namespace std;

//**********COMPLEX CLASS************************
class Complex{

private:
 double real,imag;

public:
 Complex(){
  real=imag=0;
 }
 ///////////////////////////////////////////////////
 Complex(double r){
  real=r;
  imag=0;
 }
    ///////////////////////////////////////////////////
 Complex(double r, double i){
  real=r;
  imag=i;
 }
    ///////////////////////////////////////////////////
 Complex(Complex &obj){
  real=obj.real;
  imag=obj.imag;
 }
    ///////////////////////////////////////////////////
 Complex add(Complex c){
        Complex Add;
  Add.real = real + c.real;
  Add.imag = imag + c.imag;
        return Add;
 }
    ///////////////////////////////////////////////////
 Complex sub(Complex c){
  Complex Sub;
  Sub.real = real - c.real;
  Sub.imag = imag - c.imag;
  return Sub;
 }
    ///////////////////////////////////////////////////
 Complex mult(Complex c){
        Complex Mult;
  Mult.real = real*c.real - imag*c.imag;
  Mult.imag = real*c.imag - c.real*imag;
  return Mult;
 }
    ///////////////////////////////////////////////////
 Complex div(Complex c){
  Complex Div;
  Div.real = (real*c.real + imag*c.imag)/(c.real*c.real + c.imag*c.imag);
  Div.imag = (imag*c.real + real*c.imag)/(c.real*c.real + c.imag*c.imag);
  return Div;
 }
    ///////////////////////////////////////////////////
 void print(){
        cout<<real<<"+"<<imag<<"i"<<endl<<endl;
 }
    ///////////////////////////////////////////////////
 double getReal() const{
  return real;
 }
    ///////////////////////////////////////////////////
 double getImag() const{
  return imag;
 }
    ///////////////////////////////////////////////////
 void setReal(double re){
  real = re;

 }
    ///////////////////////////////////////////////////
 void setImag(double im){
        imag = im;
 }
 ///////////////////////////////////////////////////

};

//***************MAIN***************************
int main()
{
 double real1,imag1,real2,imag2;

 cout<<"Enter the Real  part of First Number: ";
    cin>>real1;
 cout<<"Enter the imaginary  part of First Number: ";
 cin>>imag1;
    Complex obj1(real1,imag1);
 obj1.print();

 cout<<"Enter the Real part of Second Number: ";
 cin>>real2;
 cout<<"Enter the Imaginary part of second number: ";
    cin>>imag2;
    Complex obj2(real2,imag2);
 obj2.print();

 Complex c;
 c = obj1.add(obj2);
 cout<<"Addition is : ("<<c.getReal()<<")+("<<c.getImag()<<")i"<<endl;
 c= obj1.sub(obj2);
 cout<<endl<<"Subtraction is : ("<<c.getReal()<<")+("<<c.getImag()<<")i"<<endl;

 c= obj1.mult(obj2);
 cout<<endl<<"Multiplication is : ("<<c.getReal()<<")+("<<c.getImag()<<")i"<<endl;

 c= obj1.div(obj2);
 cout<<endl<<"Division result  is : ("<<c.getReal()<<")+("<<c.getImag()<<")i"<<endl;
 return 0;
}

program input-output

program output

Program images

also, find more examples here C++ Examples

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Random number generator in c++ programming

This tutorial contains

• How to generate a random number using rand()
• Simple example using rand() function
• Generate random number in a specific range dice example

To generate a random number in c++ program first we have to include a header file which is
#include<cstdlib> because we have to use a function from that library which is “rand();” this functions simple returns a random number

Let use that function

#include<iostream> #include<cstdlib> using namespace std; int main(){   cout<<rand()<<endl; return 0; }

It will return a random number for example
41
 Let use a loop and generate some more random numbers using that function

#include<iostream> #include<cstdlib> using namespace std; int main(){  for(int i=1;i<=10;i++)     cout<<rand()<<endl; return 0; }

It will generate 10 random  numbers
What if we want to generate random numbers with in the specific range like we want to generate random numbers between 1 to 10 or 50 to 100

for example range is 1 to 10

We think something like that cout<<rand()%10;

How it will work

It will take a random number divide it by 10 and return us the number the number can be from 0 to 9
After getting the output we see that if we add 1 in the result value we can get our required range values

So we will change it like that << 1 + ( rand() % 10 ) ;

Lets take another example of a dice it can generate numbers 1 to 6 randomly

 we will simple something like that
But is it write or not

for(int i=1;i<=6;i++)     cout<< rand()%6<<endl;

And there is a problem it will return us number from 0 to 5 to make the logic of our program we will change it like that

for(int i=1;i<=6;i++)     cout<< 1+ (rand()%6)<<endl;

So this will work fine in this case 0 is eliminate and whatever number will return 1 will be added in it like if 0 is generated it will result as 1 if 5 is generated it will return us 6
  
Hope this tutorial will help to understand the basic concept of random number

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