Signed Binary Number

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

int main(){
    char in[33];
    int tc;
    scanf("%d",&tc);
    for(int i=1;i<=tc;i++){
        int index = 0;
        long long res = 0;
        scanf(" %s",in);
        char bin[strlen(in)];
        for(int j=0;j<strlen(in);j++){
            if(in[j]=='1' || in[j]=='0'){
                bin[index++] = in[j];
            }
            if(in[j]=='('){
                bin[index++] = '-';
                j+=3;
            }
        }
        int digs = index-1;
        for(int j=0;j<index;j++){
            if(bin[j]=='1'){
                res+=pow(2,digs);
            }
            if(bin[j]=='-'){
                res-=pow(2,digs);
            }
            digs--;
        }
        printf("Case #%d: %lld\n",i,res);
    }
    return 0;
}