Binary to Decimal Converter

[Rocket Power]

I'm trying to make a program that takes up to a seven digit binary number and converts it to its decimal equivalent. I'm still a beginner, so this might be a simple question but how do I stop the user from entering anything but 1s and 0s? This means no decimals or numbers other than 1 or 0.

I already made it so it won't accept anything below 0 or above 1111111.

[std10093]

Welcome to the forum. Next time you post, make sure you post your try in code tags, like these [code]/* your code*/[/code].

Because it's your first post, I am going to give a sample code, in order to get ideas. Let's say I have an array, that I wanted to be filled only with zeroes and ones, by the user, in whatever cell the user wants too.
I could do that with this code

#include <stdio.h>

int main(void)
{
     int array[5];

     /* i will go through all the cells of the array */
     int i;

     for( i = 0 ; i < 5 ; i++)
     {
         do{
             /* Print message and read element,
              * until it gets the value 1 or 0 */
             printf("Input %i-th element\n", i);
             scanf("%d", &array[i]);
         }while(array[i] != 1 && array[i] != 0);
     }

     printf("The array is:\n");
     for( i = 0 ; i < 5 ; i++)
     {
         printf("array[%d] = %d\n", i, array[i]);
     }

     return 0;
}