Need some advice

i have this code to convert dinary to decimal but when i enter a binary number all it does is return the number of digits i typed i.e. if i typed 110010 it should return 50 but I get 6. Any help/advice would be greatly appreciated.

Code:

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

/*function prototype*/
int bin2dec(int binar4y);

int main()
{
    int binary;
    int decimal;
    

     printf("The decimal equivalent = %d\n",bin2dec(binary));
        
getchar();
getchar();
return 0;
}

int bin2dec(int binary)
{
         
         int b=0;
         int num[10];
         int i=0;
         int t=0;
         
         printf("Enter Binary Number\n");
         scanf("%d", &binary);
         while(binary != 0)
         {
          num[i] = binary % 10;
          binary = binary / 10;
          if(num[i] != 1 && num[i] != 0)
           t = 1;
          i++;
         }
         num[i] = 2;
         binary = 1;
         for(i = 0; num[i] != 2; i++)
         {
          b = b + num[i] * binary;
          binary = binary * 2;
         }
        
}

Perhaps bin2dec should return a value.