Something

#include <stdio.h>
#include <math.h>
 
void main()
 
{ float a,b,c,x11,x22;
  double rad,delta,im,re;

 
 printf("a=");
 scanf("%f",&a);
 printf("\nb=");
 scanf("%f",&b);
 printf("\nc=");
 scanf("%f",&c);
 
 delta=b*b-4*a*c;
/// nu ai voie rad=sqrt(b*b-4*a*c);
rad=sqrt(abs(delta));
// deltaneg=-delta;
 if (delta<0) {
  re=(-b)/(2*a);
  im=rad/2*a;
  printf("\nx1=%f+i*%f",re,im);
  printf("\nx2=%f-i*%f",re,-im);
} else {
  printf("\nx1=%f",(-b+rad)/2*a);
  printf("\nx2=%f",(-b-rad)/2*a);
}
 scanf(" ");
}