C++ array compile - c++

Question

I keep getting 3 compiling errors that say "Function definition is not allowed". I am not sure on how to fix it. I keep getting it after the int main, and after the void functions. Please help!
This is the code:
#include <iostream>
#include <iomanip>
using namespace std;
// Function prototypes
int populateIntegerArray(int *arrayPtr, int arraySize);
void displayIntegerArray(int *arrayPtr, int arraySize);
int findMaximumInteger(int *arrayPtr, int arraySize);
int populateIntegerArray(int *arrayPtr,int arraySize)
{
for(int i=0;i<arraySize;i++)
{
cout<<"Enter value for array element "<<i<<":";
cin>>arrayPtr[i];//reading values
}
void displayIntegerArray(int *arrayPtr,int arraySize)
{
for(int i=0;i<arraySize;i++)
cout<<&arrayPtr[i]<<": arrayPtr["<<i<<"] = "<<setw(15)<<arrayPtr[i]<<endl;
}
void findMaximumInteger(int *arrayPtr,int arraySize)
{
int maximum = arrayPtr[0];
for(int i=0;i<arraySize;i++)
{
if(maximum<arrayPtr[i])max=arrayPtr[i];
}
cout<<"Maximum integer in array is: "<<max<<endl;
}
int main()
{
int n;
//reading array size
cout<<"Enter desired array size:";
cin>>n;
int *a = new int[n];
cout<<"arrayPtr = "<<a<<endl;
populateIntegerArray(a,n);
displayIntegerArray(a,n);
findMaximumInteger(a,n);
cout<<"DELETING array at arrayPtr = "<<a<<endl;
delete a;
return 0;
}

Answer 1

First, you are missing the last } after the definition of populateIntegerArray and before the displayIntegerArray:
int populateIntegerArray(int *arrayPtr,int arraySize)
{
for(int i=0;i<arraySize;i++)
{
cout<<"Enter value for array element "<<i<<":";
cin>>arrayPtr[i];//reading values
}
void displayIntegerArray(int *arrayPtr,int arraySize)
Then, you have the following prototype:
int findMaximumInteger(int *arrayPtr, int arraySize);
But you define the actual function as returning void (it should be int instead):
void findMaximumInteger(int *arrayPtr,int arraySize)
{
Then, in your findMaximumInteger function, you are not defining the max variable anywhere.
Functions populateIntegerArray and findMaximumInteger are declared as returning int, but actually do not return a value. You should either return an integer, or (if you intend to just output the result to console without returning a value from a function) change the functions' prototypes to returning void (not int).