Function Cut

fn_cut.cpp

#include <iostream>
#include <string>
#include <cmath>
#include <cstdlib>
#include <sstream>

using namespace std;



string cut(string ) // error 1: there should be var name not type only.

{
  
  string x;
  int i;
  int g = x.length(); // error 2: x hasn't be initialized with any value to measure its length
  string h;
  
  
  for(i=0;i<g;i++)
  {
    
    h=x.substr(i,i+1); // error 3: the same as 2 be for variable h
    
    
    if(x.substr(0,1)!="[")
    {      
      return "error";
      break; 
    }
    if (h==" "||h=="["||h=="]")
    {
      
      h.erase(i-1,i);
    }
    if(h=="]")
    break;
  }
  return h;  
}

This is not a valid program code as it don't have main function