[m0niSx]

ah ye i've just copied and edited your code, maybe try this

Код:

float a,b,c,x1,x2,D;  
  scanf("%f",&a); 
  scanf("%f",&b); 
  scanf("%f",&c); 
  printf("readed:\na= %f\nb= %f\nc= %f\n",a,b,c);