Problem clearing buffer, could use some help.

**AdrianH** · Feb 14 '07, 12:34 AM

Originally posted by kelharis

Hello,

I am writing a program that will run once, and once done, ask the user if they would like to use it again. It has to work with any answer beginning with "y". I am having trouble with clearing the buffer when I answer "yes" or anything other than "y" itself. It works perfectly when "y" is entered, now I just need to somehow accept the other yes words and clear the buffer once the "y" has been consumed. code is as follows:

Code:

#include <stdio.h>

main ()

{


     fputs("This program will calculate a table showing the voltage,"
           "total resistance, and current for each increment of "
           "resistance given the input from the user\n\n", stdout);


     int ch, reply = 'y';
     double initcur, endcur, inccur, voltage, current;


       while ( reply == 'y' )


     {
         fputs("Enter voltage: ", stdout);
         scanf("%lf", &voltage);
         fputs("Enter initial resistance value: ", stdout);
         scanf("%lf", &initcur);
         fputs("Enter ending resistance value: ", stdout);
         scanf("%lf", &endcur);
         fputs("Enter incremental resistance value: ", stdout);
         scanf("%lf", &inccur);

         fputs("Table of induced currents\n\n", stdout);
         fputs("     Voltage     Total Resistance     Current\n\n",
         stdout);
         fputs("     ----------------------------------------\n\n",
         stdout);


         for (initcur; initcur <= endcur ; initcur += inccur )
         {
           current = voltage / initcur ;

           printf("        %.2f            %.4f        %.4f\n",
voltage, initcur, current);
         }

       fputs("\nEnd of table.\n\n", stdout);

       fputs("Would you like another computation? ", stdout);
       while ((reply = getc(stdin)) !='\n');
       scanf("%c", &reply);


      }

       return 0;

}

I am supposed to be using the getc function, not fflush, so if you can tell where I might be going wrong, I would me most appreciative. :)

You have to use getc to clear the buffer? Because you could use scanf("%*[^\n\r]%*[\n\r]"); The first format reads a line upto but not including the carraige return/line feed, the second reads all the carraige return/line feed after that.

I've seen you use scanf so it shouldn't be prohibited or anything.

Hope this helps,

Adrian

Problem clearing buffer, could use some help.

Problem clearing buffer, could use some help.

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