Thread: Debugging question

Hi guys, im kinda new here, so if i make a newbi mistake please go easy on me.

Well Im trying to make a program that will convert binary to decimal. (I know there are thousands of these post already, but i still couldnt find the answers to my question .


question # 1:
How can i pervent people from entering numbers other than 1's and 0's ?

question #2:
For some reason when I enter the binary, Im only able to enter 5 digits or less, or else my program wront work.
For e.g. i enter 11011 :: the output will be 27
But when i enter 111101 :: the output will be 0

Code:

#include <stdio.h>
#include <conio.h>

int array[1000];
int getbinary(int binary);

main()
{
	int temp;
	int binary;
	int power;
	int decimal;
	int cell;
	cell = 0;
	power = 1;
	decimal = 0;
	binary = getbinary(binary);

	do{
		temp = binary % 2;
		if (temp==1)
		{
			array[cell] = power;
		}
		else
		{
			array[cell] = 0;
		}
		cell++;
		power = power * 2;
		binary = binary * .1;
	} while(binary > 0);
	for (cell=cell; cell>=0; cell--)
	{
		decimal = array[cell] + decimal;
	}
	printf("%d decimal\n", decimal);
	getch();
}

int getbinary(int binary)
{
	printf("Please enter binary: ");
	scanf("%d", &binary);
	return binary;
}

Thx!!