Question

The following code compiles fine, but does not allow the user to choose whether or not the program is to run again. After giving the user the answer, the program automatically terminates. I placed the main code in a “do while” loop to have the ability to convert more than one time if I wanted too. I have tried to run the program in the command line (Mac and Ubuntu machines) and within XCode with the exact same results. Any assistance would be greatly appreciated.

• C Beginner

P.S. Compiling on MacBookPro running Snow Leopard.

---

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

int main(void)
{

        char anotherIteration = 'Y';

        do
        {
                const float Centimeter = 2.54f;
                float inches = 0.0f;
                float result = 0.0f;

                // user prompt
                printf("\nEnter inches: ");
                scanf("%f", &inches);

                if (inches < 0) {
                        printf("\nTry again. Enter a positive number.\n");
                        break;
                } else {
                        // calculate result
                        result = inches * Centimeter;
                }

                printf("%0.2f inches is %0.2f centimeters.\n", inches, result);

                // flush input
                fflush(stdin);

                // user prompt
                printf("\nWould you like to run the program again? (Y/N): ");
                scanf("%c", &anotherIteration);

                if ((anotherIteration != 'Y') || (anotherIteration != 'N'))
                {
                        printf("\nEnter a Y or a N.");
                        break;
                }

        } while(toupper(anotherIteration == 'Y'));

        printf("Program terminated.\n");

        return 0;
}

Answer 1

You have a few bugs, but since you’re learning, you should probably figure them out. The answer to your specific question on this program is that you probably want to be using fpurge() for stdin, not fflush().