error message

[yohanus]

im haveing problems with the following piece of code
in getting an error durring compilling which says
error c2065; 'arraySize' : undeclared identifier line 54
error c2065: 'anArray' : undeclared identifer line 55
(Shown underlined and in Itilacs in the code

#include <iostream>
 
using namespace std;
 
int sum(int [], int);
int countNmbrsBigger(int [], int, int);
int average(int [], int);
int high(int [], int);
int low(int [], int);
int find(int [], int, int);
 
 
int main (void ){
//test the array class
    const int arraySize = 10;
    int theArray[arraySize] = {1, 5, 25, 10, 12, 9, 24, 24, 22, 2}; 
 
    cout << "Sum: " << sum(theArray, arraySize) << endl; 
    cout << "Count of numbers bigger than 10: " << countNmbrsBigger(theArray, arraySize, 10) << endl;
    cout << "Average: " << average(theArray, arraySize) << endl;
    cout << "High: " << high(theArray, arraySize) << endl;
    cout << "Low: " << low(theArray, arraySize) << endl;
    cout << "Find: " << find(theArray, arraySize, 25) << endl;
    cout << "Find: " << find(theArray, arraySize, 100) << endl;
 
} 
 
 
int sum(int theArray [], int theArraySize){
//returns the sum of the values in theArray
int sum = 0;
  for (int i = 0; i < arraySize; i++) {
        [i]sum += anArray;
    }
    return sum;
    }
 
int countNmbrsBigger(int theArray [], int theArraySize, int Number){
//count the value in the array greater than 
//the parameter
 
}
 
int average(int theArray [], int theArraySize){
//average the values in the array
 
}
 
int high(int theArray [], int theArraySize){
//find the highest value in the array
 
}
 
int low(int theArray [], int theArraySize){
//find the lowest value in the array
     int lowValue = theArray[0];
     for (int i = 0; i < theArraySize; i++){
          if (theArray[i] < lowValue){
              lowValue = theArray[i];
          }
     }
     return lowValue;
}
 
int find(int theArray [], int theArraySize, int theNumber){
//return the subscript of the supplied argument
//return -1 if not found
 
}

[newb16]

Because these variableas are visible only within main()
Use parameter names:

 for (int i = 0; i <theArraySize ; i++) {
   sum += theArray[i];

[yohanus]

how do I do this I am new to C++ and am having a hard time with it the code I gave was givne to me to fix errors and these two are the ones that I could not figure out.

[newb16]

what part of the sentence is it a question

[weaknessforcats]

The customary approach is to pass the array size as a second argument.

Since both C and C++ pass only the address oif an array and not the array irtself, from the viewpoint of the called function all you have is an address. The fact that that the address is the start of an array has been lost. This is called decay of array. Therefore, always pass the number of elements to your functions.