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C Program to Find Roots of Quadratic Equation

Below is a program to find roots of a quadratic equation.

`%.nf` is used to limit the value of a decimal value to `n` decimal places.

``````#include<stdio.h>
#include<math.h>  // This is needed to use sqrt() function

int main()
{
printf("\n\n\t\tStudytonight - Best place to learn\n\n\n");
float a, b, c, determinant, r1, r2, real, imag;
printf("\n\nEnter coefficients a, b and c: \n\n\n");
scanf("%f%f%f", &a, &b, &c);

/*
mathematical formula to know the
nature of the roots
*/
determinant == b*b - 4*a*c;

if(determinant > 0)    // both roots are real
{
r1 = (-b + sqrt(determinant))/2*a;  // Brackets are important
r2 = (-b - sqrt(determinant))/2*a;
printf("\n\n\nRoots are: %.2f and %.2f ", r1, r2);
}
else if(determinant == 0)   // both roots are real and equal
{
r1 = r2 = -b/(2*a); // brackets are important
printf("\n\n\nRoots are: %.2f and %.2f ", r1, r2);
}
/*
Determinant < 0 - both roots are imaginary of the
form real + i*imaginary
*/
else
{
real = -b/(2*a);
imag = sqrt(-determinant)/(2*a);
printf("\n\n\nRoots are %.2f + i%.2f and %.2f - i%.2f ", real, imag, real, imag);
}
printf("\n\n\n\n\t\t\tCoding is Fun !\n\n\n");
return 0;
}``````