Simple code snippet, which show how to convert binary number into decimal number very easily in C.

simple_bin2dec_example.c

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
   const char binary[] = "11001";
   int decimal = strtol(binary, NULL, 2);
   printf("binary = \"%s\", decimal = %d = 0x%02X\n",
          binary, decimal, decimal);
   return 0;
}

/* my output
binary = "11001", decimal = 25 = 0x19
*/