Example for Turbo C++

/**********************************************************************************
 Statement - Convert the given binary number into decimal
 Programmer - Shanmuga Priya
 Written For - https://tamilevergreen.blogspot.in
 **********************************************************************************/
#include <stdio.h>
#include <conio.h>
void main()
{
 int num, bnum, dec = 0, base = 1, rem ;
 clrscr();

 printf("Enter a binary number(1s and 0s)\n");
 scanf("%d", &num); /*maximum five digits */
 bnum = num;
 while( num > 0)
 {
 rem = num % 10;
 dec = dec + rem * base;
 num = num / 10 ;
 base = base * 2;
 } 
 printf("The Binary number is = %d\n", bnum);
 printf("Its decimal equivalent is =%d\n", dec);
 getch();
} /* End of main() */

/*---------------------------------------------
 Output

 Enter a binary number(1s and 0s)
 10101
 The Binary number is = 10101
 Its decimal equivalent is =21
 ----------------------------------------------*/