Checking an input lenth and content

I am trying to write a script that will only allow even inputs from 2 to 98. If the user inputs an incorrect value or characters it should ask them to input the values again.

Can anybody help me with this?

I know how to check the length or if the characters are correct but can not figure out how to do both.

Thanks, Tom

If you know how to check the length and you know how to check the validity of the characters, why not do one check after the other?

I can but then if i ask them to input again after checking the second time I need to check again and so on untill i have a lot of repeating code...

I think.

Unless im thinking about it totaly wrong. I need to always ask and validate untill they input the correct value.

Code:

---

#include <stdio.h>

int main( void )
{
    char number_res[1000];
    int temp;


    printf( "enter number of resistors\n" );
    scanf( "%s", number_res );



    while(number_res[temp] < 48 || number_res[0] > 57 || number_res[1] < 48 || number_res[1] > 57){
            printf( "Please enter numbers \n" );

            printf( "enter number of resistors\n" );
            scanf( "%s", number_res );
        }
             
   
   

    printf("Number was %d\n", atoi(number_res));

    return 0;
}

---

You have a number_res that needs to be even and between 2 and 98 inclusive, right? So something like

Code:

---

while (isOdd(number_res) || isNegative(number_res) || is100OrBigger(number_res))

---

This then becomes a question of checking each condition. Note that the idea is you do all three checks with the same input before asking again.

Ah.

Thanks!

I was just trying to do somthing utterly pointless and making life much more difficult for myself.

Thanks again.

whity4420, please have a look at https://apps.sourceforge.net/mediawi...tle=Scanf_woes regarding scanf.