#include <stdlib.h>
#include <stdio.h>
 
int main ()
{
    int decimalValue=0;
    int nextDigit;
    char binary;
 
 
    printf("Enter Binary Number ! \n");
    binary = getchar();
 
 
    if (binary > '1' || binary < '0')
          {
              printf("ERROR!  \n");
          }
    else
          {
                    while (binary == '1' || binary == '0')
                          {                 
                                              if (  binary == '1')
                                                    { 
                                                              nextDigit=1;           
                                                    }
 
                                              else   
                                                    {                     
                                                                nextDigit=0;
                                                    }      
 
 
 
                              decimalValue = decimalValue*2 + nextDigit ; 
                              binary = getchar();
 
 
 
 
 
 
                          }   
 
 
 
 
 
                       printf ("The Decimal Value = %i\n", decimalValue);
 
            }
 
 
 
    system("PAUSE");
    return 0;
}