# How do you write a C program to solve quadratic equation

## WRITE A C PROGRAM TO CALCULATE ROOTS OF A QUADRATIC EQUATION

```/* How do you write a c program to solve quadratic equation */

#include<stdio.h>
#include<math.h>

int main(){
float a,b,c;
float d,root1,root2;

printf("Enter a, b and c of quadratic equation: ");
printf("\nA : ");
scanf("%f",&a);
printf("\nB : ");
scanf("%f",&b);
printf("\nC : ");
scanf("%f",&c);

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

if(d < 0){
printf("Roots are complex number.\n");

printf("Roots of quadratic equation are: ");
printf("%.3f%+.3fi",-b/(2*a),sqrt(-d)/(2*a));
printf(", %.3f%+.3fi",-b/(2*a),-sqrt(-d)/(2*a));

return 0;
}
else if(d==0){
printf("Both roots are equal.\n");

root1 = -b /(2* a);
printf("Root of quadratic equation is: %.3f ",root1);

return 0;
}
else{
printf("Roots are real numbers.\n");

root1 = ( -b + sqrt(d)) / (2* a);
root2 = ( -b - sqrt(d)) / (2* a);
printf("Roots of quadratic equation are: %.3f , %.3f",root1,root2);
}

return 0;
}

/*

OUTPUT:
Enter a, b and c of quadratic equation:
A : 2

B : -2

C : -1
Roots are real numbers.
Roots of quadratic equation are: 1.366 , -0.366
*/
```