Thread: Denying a decimal value

Ello. I just made a program with 4 choices at a menu. However, if I enter a decimal like "1.5" the program just loops over and over. I'm not really sure how to I guess "deny" a decimal value, I've tried a few things but they didn't work. Here's my code:

Code:

int menu()
{
    printf("Please enter your choice from one of the following options.\n");
    printf("1. Play the guessing game.\n");
    printf("2. Play the square game.\n");
    printf("3. View your current score.\n");
    printf("4. Quit.\n");

    while(1)
    {
        int choice = 0;

        scanf("%d", &choice);

        if(choice < 1 || choice > 4)//If the user-inputted choice is not a correct value on the menu, return an error message.
        {
            printf("Sorry, that is not a valid choice. Please try again.\n");
        }

        else
        {
            return choice;
            break; //If the user-inputted choice is a correct value on the menu, break out of the loop.
        }
    }
}

Move line 11 to be line 3.

choice is an integer if you enter 1.5 the .5 part gets lost and it should see just the 1 ... there may be problems in other parts of your code causing it to loop. What happens if you enter a 1?

Also you should be checking the return value of scanf()...

Code:

int choice = 0;

while (1)
  {
     if (scanf("%d",&choice) && choice >0 && choice < 5)
        return choice;

     puts("Sorry invalid choice");
   }

Any other value that's within limits does what it's supposed to do, if the value is a whole number outside the limits, it asks for a new value until a correct value is taken. Only decimals are screwing this up :l.

Originally Posted by shukiren

Any other value that's within limits does what it's supposed to do, if the value is a whole number outside the limits, it asks for a new value until a correct value is taken. Only decimals are screwing this up :l.

That's why you need to check the return value of scanf()... don't be lazy... look it up!

Nvm >.<. Wasn't reading the program details close enough. Says: "The users will enter the correct type of information requested at all times." Woo. Thanks for the help anyway.

But I'm still gonna look into this cause I'm curious.