.

[Пафката Дешев]

#include <stdio.h>

#include <math.h>

int main()

{

 double a, b, c, x1, x2, D;

 char choice = 'a';

 while( choice != 'e' )

 {

  printf( "a: " );

  scanf( "%lf", &a );

  printf( "b: " );

  scanf( "%lf", &b );

  printf( "c: " );

  scanf( "%lf", &c );

  D = b*b - 4*a*c;

  if( D < 0 )

   printf( "Nqma realni koreni.\n" );

  else if( D == 0 )

  { 

   x1 = (-b) / (2*a);

   printf( "D: %lf\n", D );

   printf( "Dva ednakvi realni korena: %lf\n", x1 );

  }

  else

  { 

   x1 = (-b + sqrt(d)) / (2*a);

   x2 = (-b - sqrt(d)) / (2*a);

   printf( "D: %lf\n", D );

   printf( "x1: %lf, x2: %lf\n", x1, x2 );

  }

  printf( "exit? y/n " );

  scanf( "%c", &choice );

  getchar( );

  if( choice == 'y' )

   break;

 }

 return 0;

}