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C Program to Find the Roots of a Quadratic Equation using if-else

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YasminRadwan26
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2022-06-20
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C Program to Find the Roots of a Quadratic Equation using if-else

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YasminRadwan26
2022-06-20
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The below program ask the user to enter the value of a,b and c. After getting the value from the user it will calculate on the basis of ‘Discriminant’ value.

#include <stdio.h>
#include <math.h>
int main()
{
    float a, b, c;
    float root1, root2, imaginary;
    float discriminant;
    printf("Enter value of a of quadratic equation (aX^2 + bX + c): ");
    scanf("%f", &a);
    printf("Enter value of b of quadratic equation (aX^2 + bX + c): ");
    scanf("%f",&b);
    printf("Enter values of c of quadratic equation (aX^2 + bX + c): ");
    scanf("%f",&c);
    // Find discriminant of the equation
    discriminant = (b * b) - (4 * a * c);
    //Check different cases for the discriminant
    if(discriminant > 0)
    {
        root1 = (-b + sqrt(discriminant)) / (2*a);
        root2 = (-b - sqrt(discriminant)) / (2*a);
        printf("Two distinct and real roots exists: %.2f and %.2f", root1, root2);
    }
    else if(discriminant == 0)
    {
        root1 = root2 = -b / (2 * a);
        printf("Two equal and real roots exists: %.2f and %.2f", root1, root2);
    }
    else if(discriminant < 0)
    {
        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);
    }
    return 0;
}

Output:

Enter value of a of quadratic equation (aX^2 + bX + c): 2
Enter value of b of quadratic equation (aX^2 + bX + c): 7
Enter values of c of quadratic equation (aX^2 + bX + c): 2
Two distinct and real roots exist: -0.31 and -3.19

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