This C program calculates the roots of a quadratic equation of the form ax^2 + bx + c = 0.

Quadratic equations play a vital role in mathematics and physics, and finding their roots is a fundamental operation. A quadratic equation is an equation of the form ax² + bx + c = 0, where a, b, and c are constants. In this program, we will write a C program to calculate the roots of a quadratic equation using the quadratic formula.

## Problem statement

We need to develop a C program that takes input values for the coefficients a, b, and c of a quadratic equation and calculates its roots. The program should handle different scenarios, such as real and distinct roots, real and equal roots, and imaginary roots.

## C Program to Find the Roots of a Quadratic Equation

#include <stdio.h> #include <math.h> int main() { double a, b, c, discriminant, root1, root2, realPart, imaginaryPart; printf("Enter coefficients a, b, and c: "); scanf("%lf %lf %lf", &a, &b, &c); discriminant = b * b - 4 * a * c; if (discriminant > 0) { root1 = (-b + sqrt(discriminant)) / (2 * a); root2 = (-b - sqrt(discriminant)) / (2 * a); printf("Roots are real and different.\n"); printf("Root 1 = %.2lf\n", root1); printf("Root 2 = %.2lf\n", root2); } else if (discriminant == 0) { root1 = root2 = -b / (2 * a); printf("Roots are real and same.\n"); printf("Root 1 = Root 2 = %.2lf\n", root1); } else { realPart = -b / (2 * a); imaginaryPart = sqrt(-discriminant) / (2 * a); printf("Roots are complex and different.\n"); printf("Root 1 = %.2lf + %.2lfi\n", realPart, imaginaryPart); printf("Root 2 = %.2lf - %.2lfi\n", realPart, imaginaryPart); } return 0; }

## How It Works

- The program begins by including the necessary header files:
`<stdio.h>`

for input/output operations and`<math.h>`

for mathematical functions like`sqrt()`

. - Inside the
`main()`

function, variables are declared to store the coefficients (`a`

,`b`

,`c`

), the discriminant (`discriminant`

), and the roots (`root1`

,`root2`

) of the quadratic equation. There are also variables to store the real and imaginary parts of the roots in case they are complex (`realPart`

,`imaginaryPart`

). - The user is prompted to enter the values of coefficients
`a`

,`b`

, and`c`

using`printf()`

and`scanf()`

functions. - The discriminant of the quadratic equation is calculated using the formula
`b * b - 4 * a * c`

. The value of the discriminant determines the nature of the roots. - Using conditional statements (
`if`

,`else if`

,`else`

), the program checks the value of the discriminant to determine the type of roots. - If the discriminant is greater than 0, it means the roots are real and different. The program calculates the roots using the quadratic formula (
`(-b + sqrt(discriminant)) / (2 * a)`

and`(-b - sqrt(discriminant)) / (2 * a)`

) and displays them using`printf()`

. - If the discriminant is equal to 0, it means the roots are real and equal. The program calculates the root using the formula
`root1 = root2 = -b / (2 * a)`

and displays it. - If the discriminant is less than 0, it means the roots are complex. The program calculates the real and imaginary parts of the roots using the formulas
`realPart = -b / (2 * a)`

and`imaginaryPart = sqrt(-discriminant) / (2 * a)`

. It then displays the roots in the form`realPart + imaginaryPart i`

and`realPart - imaginaryPart i`

using`printf()`

. - Finally, the program ends by returning 0 from the
`main()`

function.

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