Thread: scanf acting strange...

In my program, i ask for 1 number and 3 prices.

Then i multiply each price with there respective number of articles.

Then print out the amout of items and there cost.

Here is my ouput.
-------------------------------------------------------------------------------------------------
Entrez votre besoin journalier d'energie maximale en kilo watt heure (kWh).
25

Entrez le prix ($) des batteries de 4.8 volt.
1730.57

Entrez le prix ($) des convertisseurs de 5 kilo watt.
509.01

Entrez le prix ($) des panneaux photovoltaique en metre carre.
899.99

2 6 48 //The amout of item 1, 2, and 3.
1730.569946 ; 509.010010 ; 899.989990 ; //The cost of item 1, 2, and 3
//The starnge thing is that those costs arent exactly the ones i entered.

Afin d'installer un bloc d'alimentation electrique photovoltaique a panneaux pla
ts pour l'utilisation residentielle a Ottawa, ON, vous aurez besoin de:

6 Batteries (4.800000 V) = 10383.419922 $
2 Convertisseurs (5.000000 KW) = 1018.020020 $
48 Panneaux photovoltaique (m^2) = 43199.519531 $

Pour un prix total de: 54600.960938 $
//And then when i do the total cost, i have to many decimals....

Press any key to continue . . .

Here is the fonction that uses scanf, can somedy tell me how i can fix this problem or is there nothing that i can do about it?

Code:

float validate_input(int disperror)
{
      float choice;
      int numchar = 0;
      char c;

      if(disperror == 1)
             {
                   printf("\nErreur. Entrez une nouvelle valeur.\n");
             }

      fflush(stdin);
      scanf("%f", &choice);

      do 
      {
      scanf("%c", &c);
      numchar += 1 ;
      } while(c != '\n');

      if(numchar != 1)
             {
                   choice = validate_input(1);
             }

      if(choice <= 0)
             {
                   choice = validate_input(1);
             }

      return choice;
}

read a your decimal values uisng the double data type and read them uisng the %ld format specifier. And about the no of decimal places

Code:

printf("%.2f", num);   // would get u to 2 decimal places after the point

And dont use fflush function read FAQ to understand why.

ssharish

ty very much