Array with hex values in C++ -

for last day have had problems code. here want upload .txt several hexadecimal values , if sum of first 5 numbers equal last number, code correct.then, method main have check if rest methods succeeded. don't know how this, need help...

#include <iostream> #include <fstream>  #define filecode  "file.txt" #define n_code 6  using namespace std;  ifstream file;  void uploadcode(bool& exist, unsigned int longcode, unsigned int code[]); bool isvalidcode(unsigned int code[]);  void main() {     unsigned int code[n_code];     bool exist;     unsigned int longcode=n_code;     isvalidcode(code);     if(isvalidcode(code)==true){         uploadcode(exist,longcode,code); //here have problem because don't know how call method         cout << "success" << endl;     }     else         cout << "fail" << endl;  }  void uploadcode(bool& exist, unsigned int longcode, unsigned int code[]) {     int i;     file.open(filecode);     if(file){         exist=true;         for(int i=0;i<longcode;i++){             file >> hex >> code[i];             cout << "number " << << ":  "<< code[i] << endl;         }          cout << "exist" << endl;     }     else         cout << "no exist" << endl;         exist=false;     file.close();  }  bool isvalidcode(unsigned int code[]) {     int i;     int sum=0;     for(int i=0; i<n_code-1; i++)         sum+=code[i];         cout << "sum first 5 numbers:  " << sum << endl;     if(sum==code[6])         return true;     else         return false;     return sum; } 

here's minimally modified version want. of course, better checks should done on return values of input processing (i.e. - file >> hex >> code[i];) see if inputs succeeding or not.

bool uploadcode(unsigned int longcode, unsigned int code[])  {     bool ret;      file.open(filecode);  // todo: no need global here; use locally constructed ifstream      if (file.good())     {         ret = true;          for(int = 0; < longcode; ++i)         {             file >> hex >> code[i];             cout << "number " << << ":  "<< code[i] << endl;         }          cout << "exist" << endl;     }     else     {         ret = false;         cout << "no exist" << endl;     }      file.close();      return ret; }  int main()  {     unsigned int code[n_code];      if (!uploadcode(n_code, code))     {       cout << "file failure!" << endl;       return 1;     }      if (!isvalidcode(code))     {         cout << "code failure!" << endl;         return 2;     }      cout << "success" << endl;      return 0; }