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C program to find roots of a quadratic equation

C program to find roots of a quadratic equation: This program calculates roots of a quadratic equation. Coefficients are assumed to be integers, but roots may not be real. Discriminant (b*b-4*a*c) decides the nature of roots. In the program, j stands for iota.
C programming code

```
#include <stdio.h>
#include <math.h>
int main()
{
int a, b, c, d;
double root1, root2;
printf("Enter a, b and c where a*x*x + b*x + c = 0\n");
scanf("%d%d%d", &a, &b, &c);
d = b*b - 4*a*c;
if (d < 0) { //complex roots
printf("First root = %.2lf + j%.2lf\n", -b/(double)(2*a), sqrt(-d)/(2*a));
printf("Second root = %.2lf - j%.2lf\n", -b/(double)(2*a), sqrt(-d)/(2*a));
}
else { //real roots
root1 = (-b + sqrt(d))/(2*a);
root2 = (-b - sqrt(d))/(2*a);
printf("First root = %.2lf\n", root1);
printf("Second root = %.2lf\n", root2);
}
return 0;
}
```

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