find a value of a quadric equation

#include main() { float a,b,c,d,root1,root2; printf("Enter value of a,b and c:"); scanf("%f%f%f",&a,&b,&c); d=b*b-4*a*c; if(d<0) { printf("Roots are complex number.\n"); printf("Roots of quadric equation are: "); printf("%3f+%3fi and ",(-b/(2*a)),sqrt(-d)/(2*a)); printf("%3f-%3fi",(-b/(2*a)),sqrt(-d)/(2*a)); } else if(d==0) { printf("Roots are equal.\n"); root1=root2=(-b/(2*a)); printf("Roots of quadric equation are: "); printf("%3f and %3f",root1,root2); } else { printf("Roots are real number\n"); root1=(-b+sqrt(d))/(2*a); root2=(-b-sqrt(d))/(2*a); printf("Roots of quadric equation are: "); printf("%3f and %3f",root1,root2); } return 0; }