Working with Arrays and Functions

[lchopkins1]

Okay, so I am working on a program and have the following code so far. I am receiving these errors:
------

lab1c.C: In function ‘int main()’:
lab1c.C:30: error: invalid conversion from ‘int’ to ‘int*’
lab1c.C:14: error: too few arguments to function ‘void copyArray(const int*, int*, int)’
lab1c.C:30: error: at this point in file

------

I tried to do some research and think it might be something about using pointers, but I haven't used pointers before so I am not sure how to fix these. I am just learning how to use arrays so I apologize if the code is not pretty or its completely ridiculous.

#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;

void fillArray(int A[], int s);
void copyArray(const int A[], int B[], int s);
void printArrayA(int A[], int s);
void printArrayB(int B[], int s);
int bet80and100(int A[], int s);
int divby5(int A[], int s);
float FindAvg(int A[], int s);
int FindMin(int A[], int s);

int main()
{

  const int SIZE = 10;
  int A[SIZE];
  int B[SIZE];

  fillArray(A, SIZE);
  copyArray(B, SIZE);
  bet80and100(A, SIZE);
  divby5(A, SIZE);
  FindAvg(A, SIZE);
  FindMin(A, SIZE);

  cout << "The number of elements between 80 and 100 is " << bet80and100(A, SIZE) << endl;
  cout << "The number of elements between 80 and 100 is " << divby5(A, SIZE) << endl;
  cout << "The average of all elements in Array A is " << FindAvg(A, SIZE) << endl;

  return 0;
}

//A                                                                                                                                   
void fillArray(int A[], int s)
{
  //fill the array with #'s read from input file                                                                                      

  ifstream fin;
  fin.open("data2.txt");

  if(!fin)
    cout << "data2.txt does not exist." << endl;
  else //data2.txt exists                                                                                                             
    {
      for(int i=0; i<s; i++)
        fin >> A[i];
    }

}

//B                                                                                                                                   
void copyArray(const int A[], int B[], int s)
{
  for(int i=s-1, j=0; j<s; i--, j++)
    B[j]= A[i];
}

//C                                                                                                                                   
void printArrayA(int A[], int s)
{
  cout << "Array A includes: ";
  for(int i=0; i<s; i++)
    cout << A[i] << "  ";
  cout << endl;
}

//D                                                                                                                                   
void printArrayB(int B[], int s)
{
  cout << "Array B includes: ";
  for(int i=0; i<s; i++)
    cout << B[i] << "  ";
  cout << endl;
}

//E                                                                                                                                   
int bet80and100(int A[], int s)
{
  int count = 0;

  for(int i=0; i<s; i++)
    if(A[i] <= 100 && A[i] >= 80)
      count++;

  return count;

}

//F                                                                                                                                   
int divby5(int A[], int s)
{
  int count = 0;

  for(int i=0; i<s; i++)
    if(A[i] % 2 == 0)
      count++;

  return count;
}

//G                                                                                                                                   

//H                                                                                                                                   
float FindAvg(int A[], int s)
{
  int num = 0;

  for(int i=0; i<s; i++)
    num = A[i] + num;

  float avg = num/3.0;

  return avg;
}

//I                                                                                                                                   
int FindMin(int A[], int s)
{
  int min = A[0];

  for(int i=1; i<s; i++)
    if(A[i] < min)
      min = A[i];

  return min;
}

[Lynx876]

[ code ] code here [ / code ] Tags. (:

Check line 23.

And do you know what line is giving the error:
lab1c.C:30: error: invalid conversion from ‘int’ to ‘int*’

#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;

void fillArray(int A[], int s);
void copyArray(const int A[], int B[], int s);
void printArrayA(int A[], int s);
void printArrayB(int B[], int s);
int bet80and100(int A[], int s);
int divby5(int A[], int s);
float FindAvg(int A[], int s);
int FindMin(int A[], int s);

int main()
{

    const int SIZE = 10;
    int A[SIZE];
    int B[SIZE];

    fillArray(A, SIZE);
    copyArray(B, SIZE); // too few params: copyArray( A, B, SIZE );
    bet80and100(A, SIZE);
    divby5(A, SIZE);
    FindAvg(A, SIZE);
    FindMin(A, SIZE);

    cout << "The number of elements between 80 and 100 is " << bet80and100(A, SIZE) << endl;
    cout << "The number of elements between 80 and 100 is " << divby5(A, SIZE) << endl;
    cout << "The average of all elements in Array A is " << FindAvg(A, SIZE) << endl;

    return 0;
}

//A
void fillArray(int A[], int s)
{
    //fill the array with #'s read from input file

    ifstream fin;
    fin.open("data2.txt");

if(!fin)
    cout << "data2.txt does not exist." << endl;
else //data2.txt exists
{
    for(int i=0; i<s; i++)
    fin >> A[i];
}

}

//B
void copyArray(const int A[], int B[], int s)
{
    for(int i=s-1, j=0; j<s; i--, j++)
    B[j]= A[i];
}

//C
void printArrayA(int A[], int s)
{
    cout << "Array A includes: ";
    for(int i=0; i<s; i++)
    cout << A[i] << " ";
    cout << endl;
}

//D
void printArrayB(int B[], int s)
{
    cout << "Array B includes: ";
    for(int i=0; i<s; i++)
    cout << B[i] << " ";
    cout << endl;
}

//E
int bet80and100(int A[], int s)
{
    int count = 0;

    for(int i=0; i<s; i++)
    if(A[i] <= 100 && A[i] >= 80)
    count++;

    return count;

}

//F
int divby5(int A[], int s)
{
    int count = 0;

    for(int i=0; i<s; i++)
    if(A[i] % 2 == 0)
    count++;

    return count;
}

//G

//H
float FindAvg(int A[], int s)
{
    int num = 0;

    for(int i=0; i<s; i++)
    num = A[i] + num;

    float avg = num/3.0;

    return avg;
}

//I
int FindMin(int A[], int s)
{
    int min = A[0];

    for(int i=1; i<s; i++)
    if(A[i] < min)
    min = A[i];

    return min;
} 

EDIT:
After fixing line 23, I can compile and run the program. So I don't know where that error is coming from, for you.

[lchopkins1]

After fixing the line you fixed, all the errors went away.. thanks!

I also have another question, I have a function in there that finds the number of elements in the array that are divisible by 5. I also need to create another function that displays the index for all the elements that are divisible by 5... can you help me with this?

[Lynx876]

You could use the modulus operator;
http://www.cprogramming.com/tutorial/modulus.html

a number % 5 would give the result of 0, if the number is divible by 5.

So use this with !;

if( ! ( num % 5 ) )
{ /* do stuff */ }

if num is equal to 15
num modulus 5 would be 3 with a remainder of 0( false )
so ( ! 0 ) is true.

Hope I explained that ok. (:

[lchopkins1]

I understand how to use the modulus operator to find if a number is divisible by 5, but I have to go through the values in the Array and determine if they are divisible by 5 (which I did in the function above, see comment //F) but then I need to print the INDEX number of the array for all the numbers in the array that are divisible by 5. Does this make sense?

[Lynx876]

You already have the index number.

Pass another array, to save the index, and use the 'i' from the for-loop and have a counter increment. i.e.

index[ counter ] = i;
counter++;