Question

So. Writing application in C, unix, and i have function, which requests user input until input is valid.
lets go straight:

int inputX()
{
    int result;
    char input;
    while(1)
    {
        printf("Input x (a, b, c, d, e, f, g, h) :");
        scanf("%c", &input);
        result = validChar(input);
        if (result >= 0)
        {
            return result;  
        }
        else
        {
            printf("Invlid input. Lets try again.\n");
        }
    }
}

validChar() checks if input is a – h.
If i input a – everything is fine.
If i input e.g. 1, output is

Input x (a, b, c, d, e, f, g, h) :1
Invlid input. Lets try again.
Input x (a, b, c, d, e, f, g, h) :Invlid input. Lets try again.
Input x (a, b, c, d, e, f, g, h) :

i even tried sleep(), but didnt work..
C is tricky : |

Answer 1

Use this cheap trick to get rid of blanks left over in the buffer:

scanf(" %c", &input);
       ^