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Practice30.c
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Practice30.c
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// Write a C program to find roots of a quadratic equation using switch case.
#include <stdio.h>
#include <math.h> /* Used for sqrt() */
int main()
{
float a, b, d;
float root1, root2, imaginary;
float discriminant;
printf("Enter values of a, b, d of quadratic equation (aX^2 + bX + d): ");
scanf("%f%f%f", &a, &b, &d);
/* Calculate discriminant */
discriminant = (b * b) - (4 * a * d);
/* Compute roots of quadratic equation based on the nature of discriminant */
switch (discriminant > 0)
{
case 1:
/* If discriminant is positive */
root1 = (-b + sqrt(discriminant)) / (2 * a);
root2 = (-b - sqrt(discriminant)) / (2 * a);
printf("Two distinct and real roots exists: %.2f and %.2f",
root1, root2);
break;
case 0:
/* If discriminant is not positive */
switch (discriminant < 0)
{
case 1:
/* If discriminant is negative */
root1 = root2 = -b / (2 * a);
imaginary = sqrt(-discriminant) / (2 * a);
printf("Two distinct complex roots exists: %.2f + i%.2f and %.2f - i%.2f",
root1, imaginary, root2, imaginary);
break;
case 0:
/* If discriminant is zero */
root1 = root2 = -b / (2 * a);
printf("Two equal and real roots exists: %.2f and %.2f", root1, root2);
}
break;
}
return 0;
}