#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main()
{
  float entree=0,arrondi=0;
  printf("entrez prix:");
  scanf("%f",&entree);
  if(entree < 0)
    return 1;  
  printf("arrondi a l'euro inferieur:%.2f\n",(float)floor(entree));
  arrondi=floor(entree+0.5);
  printf("arrondi au plus proche:%.2f\n",arrondi);
  arrondi=floor(entree*4+0.5)/4;
  printf("arrondi au quart:%.2f\n",arrondi);
  return 0;
}