/* Binary to Decimal **********************************************************/
 
#include <iostream>
#include <cstdio>
using namespace std;
 
bool binary[8]; // unused, but if you need to store it, it will be in here
char str[8];    // input string
int result;     // integer result
int power = 1;  // power of 2. This is needed because of (2 ^ i) problem (see below)
 
int main(void)
{
    do  
    {
        cout << "Please input an 8 bit binary number or type q to quit:";
        cin >> str;
 
        result = 0; // reset to 0
        power = 1;  // first power = 2 ^ 0 = 1
 
        /* convert it */
        for(int i = 0; i < 8; i++)
        {
            if(str[i] == '1')
            {
                binary[i] = 1;// make binary number
                result += power; // modify result
            }    
            power *= 2; /* id like to use 2 ^ i instead of power but it
                         DOESNT give 1, 2, 4, 8, 16 ect... */
        }
 
        /* output */
        cout << "\nThe binary number " << str << " = " << result << "\n";
    } while (str[0] != 'q');   // do - while until "q" is typed 
    return 0;
}

#include<stdio.h>
 
char binary[8]; // unused, but if you need to store it, it will be in here
char str[8];    // input string
int result;     // integer result
int power = 1;  // power of 2. This is needed because of (2 ^ i) problem (see below)
 
int main(void)
{
    do  
    {
        printf ("Please input an 8 bit binary number or type q to quit:");
        scanf ("%s", str);
 
        result = 0; // reset to 0
        power = 1;  // first power = 2 ^ 0 = 1
 
        /* convert it */
        for(int i = 0; i < 8; i++)
        {
            if(str[i] == '1')
            {
                binary[i] = 1;// make binary number
                result += power; // modify result
            }    
            power *= 2; /* id like to use 2 ^ i instead of power but it
                         DOESNT give 1, 2, 4, 8, 16 ect... */
        }
 
        /* output */
        printf ("\nThe binary number %s = %d\n\n", str, result);
    } while (str[0] != 'q');   // do - while until "q" is typed 
 
    return 0;
}

#include <stdio.h>
 
int main(void)
{
   int binary   = 0;    /* initialize the result to zero */
   int bitvalue = 1;    /* starting place value for bits */
   int decimal  = 1011; /* "decimal" value to "convert"  */
   while ( decimal )
   {
      binary   += decimal % 10 * bitvalue; /* get new bit and add to result */
      bitvalue *= 2;                       /* adjust base-2 place value     */
      decimal  /= 10;                      /* get next "decimal"            */
   }
   printf("binary = %d\n", binary);
   return 0;
}
 
/* my output
binary = 11
*/

 int main()
{
clrscr();
int b,d=0,a[100];
for(int z = 0;z<100;z++)        //initialising
 {
  a[z] = 0;
 }
 
cout<<"enter the binary no."<<endl;
cin>>b;
int c = 0,p;
while(b>0)
{
 int r = b%10;
 b = b/10;
 p = pow(2,c);
 d = d + (r*p);
 a[c] = r;
 c++;
}
cout<<"the decimal equivalent is "<<d<<endl;
return 0;
}