Write a C Program to find the roots of a quadratic equation

#include<stdio.h>

int main()
{
	float a, b, c, d, root1, root2;
	printf("Enter the coefficients a, b and c :   ");
	scanf("%f %f %f", &a, &b, &c);
	d = b*b - 4*a*c;
	if (d==0){
		printf("The roots of quardratic equation are__ %.2f", -b/(2*a));
	}
	else if (d>0){
		root1=(-b + sqrt(d))/(2*a);
		root2=(-b - sqrt(d))/(2*a);
		printf("nRoot1 = %.2f",root1);
	    printf("nRoot2 = %.2f",root2);
	}
	else{
		float real, imag;
		real = -b/(2*a);
		imag = sqrt(-d)/(2*a);
		printf("nRoot1 = %.2f+%.2fi", real, imag);
	    printf("nRoot2 = %.2f-%.2fi", real, imag);
	} 
	return 0;
}