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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strncat function c++ example source code

strncat function used to concatenate two strings upto specified number of characters. It takes 3 parameters first and second is string third is n where n is number of characters to append first string from second string.
For example
first_string: Hello
second_string: World

strncat( first_string, second_string, 3);

The result will be: Hello Wor

Example program
Write a c++ program which takes 3 inputs from two strings and third is the value of n( the number of characters to append from second string) and display the resultant string.

strncat function C++ source code

#include <iostream>
#include <string.h>
#include <stdio.h>

using namespace std;

int main()
{
    char str1[100],str2[100];

    cout<<"\nEnter first string: ";
    gets(str1);

    cout<<"\nEnter second string: ";
    gets(str2);

    int n;
    cout<<"\nEnter number of characters to concatenat: ";
    cin>>n;
    strncat(str1, str2, n);

    cout<<"\n\n\t\Resultant first String after concatenation: "<<endl;
    cout<<"\n\n\t\t\t"<<str1<<"\n\n\t\t\t";

          return 0;
}

Program output

  
It is recommended to change the code and examine the output of program.
See Also: strcat function example c++ source code

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