Data Validation in C using while Loop

Question

#include<stdio.h>
main()
{
    char status;
    printf("STATUS     SYMBOL\n");
    printf("------     ------\n");
    printf("Senior        s\n");
    printf("Junior        j\n");    
    while(1)
    {       
        printf("Please Enter the Salesperson's Status : ");
        scanf("%c",&status);
        if (status=='s' || status=='j')
        {
            if(status=='s')
            {
                printf("Weekly Salary is --- $400\n");
                break;
            }
            else
            {   
                printf("Weekly Salary is --- $275\n");
                break;
            }
        }
        else
        {
            printf("Please Enter a Valid Symbol!\n");

        }
    }
}

When an Invalid data is entered,this program must ask user for a valid data.The While Loop used for validating the Data executing Two times,in order to ask the user for Input. Why the scanf function is being ignored on the First-Go? How to solve this Problem? Program Output

`scanf("%c",&status);` ==> `scanf(" %c",&status);` note the added space. — Weather Vane, Mar 05 '17 at 19:37
Use `" %c"` so you skip over whitespace before the status character. — Barmar, Mar 05 '17 at 19:37
**Always** check the result of `scanf` and other functions which can encounter error conditions relevant for program execution. — too honest for this site, Mar 05 '17 at 19:48

score 0 · Answer 1 · answered Mar 05 '17 at 19:41

0

Because when you type a<ENTER> you type 2 characters. So the first scanf get the a, the second one gets the \n (ENTER).

You can change your scanf to get 2 characters instead of one.

scanf("%c%c", &status, &newline);

answered Mar 05 '17 at 19:41

SegFault

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Or even `scanf("%c%*c", &status);` – Weather Vane Mar 05 '17 at 19:48

Data Validation in C using while Loop

1 Answers1