Binary to decimal converter

bintodec.c

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

// binary to decimal 
int bin_to_dec(char *bin) {
    int i, dec = 0, len = strlen(bin);
    for (i = 0; i < len; i++) {
        dec += (bin[i] - '0') * pow(2, len - i - 1);
    }
    return dec;
}
 
int main() {
    char binarynum[] = "1000101";
    printf("%d\n", bin_to_dec(&binarynum));
}