By | 24.12.2016

# Roots of Quadratic Equation using if else

Write a C++ Program to Find Roots of Quadratic Equation using if else. Here’s simple C++ Program to Find Roots of Quadratic Equation using if else in C++ Programming Language.

Here is source code of the C++ Program to Find Roots of Quadratic Equation using if else. The C++ program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.

## SOURCE CODE : :

```/*  C++ Program to Find Roots of Quadratic Equation using if else  */

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

int main()
{

float a, b, c, x1, x2, determinant, realPart, imaginaryPart;
cout << "Enter coefficient a :: ";
cin >> a ;
cout << "\nEnter coefficient b :: ";
cin >> b ;
cout << "\nEnter coefficient c :: ";
cin >> c ;

determinant = b*b - 4*a*c;

if (determinant > 0)
{
x1 = (-b + sqrt(determinant)) / (2*a);
x2 = (-b - sqrt(determinant)) / (2*a);
cout << "\nRoots are real and different." << endl;
cout << "\nx1 = " << x1 << endl;
cout << "\nx2 = " << x2 << endl;
}

else if (determinant == 0)
{
cout << "\nRoots are real and same." << endl;
x1 = (-b + sqrt(determinant)) / (2*a);
cout << "\nx1 = x2 = " << x1 << endl;
}

else
{
realPart = -b/(2*a);
imaginaryPart =sqrt(-determinant)/(2*a);
cout << "\nRoots are complex and different."  << endl;
cout << "\nx1 = " << realPart << "+" << imaginaryPart << "i" << endl;
cout << "\nx2 = " << realPart << "-" << imaginaryPart << "i" << endl;
}

return 0;
}```

### Output : :

```/*  C++ Program to Find Roots of Quadratic Equation using if else  */

Enter coefficient a :: 4

Enter coefficient b :: 5

Enter coefficient c :: 1

Roots are real and different.

x1 = -0.25

x2 = -1

Process returned 0```

Above is the source code for C++ Program to Find Root of Quadratic Equation using if else which is successfully compiled and run on Windows System.The Output of the program is shown above .

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