How would I find the sum/average of an array of numbers

[Austinomical]

I have been writing a program that prints an array of random numbers and then its reverse. It then prints the min and max. Now, I am trying to find the sum and average using functions and I have come close, but I need a little help if anyone knows how. Here is what I have so far; you will notice everything was working except my call and definition for each.

#include <time.h>
#include <iostream>
#include <stdlib.h>
using namespace std;

// Function prototypes
void showArray ( int a[ ], int size ); // shows the array in the format "int a [ ] = { 3, 7, 4, ... ,5, 6, 3, 4, 7 } "
void showReverse ( int a[ ], int size ); // shows the array in reverse using the format "int a [ ] = { 7, 4, 3, 6, 5, ... , 4, 7, 3 } "
int  lowest ( int a[ ], int size ); // finds and returns the lowest value in the array (should be 7)
int  highest ( int a[ ], int size ); // finds and returns the highest value in the array (should be 3)
int  sumArray ( int a[ ], int size ); // calculates and returns the sum of all values in the array
float averageVal ( int a[ ], int size ); // calculates and returns the average of all values in the array
// **************************************************************************************************************************************
int main ()
{
// Array and reverse array
    srand((int)time(NULL));
    int i=0;
    const int SIZE = 25;
    int randvalue[SIZE];


    cout << "Making an array of 25 random integers from 3 to 7!" << endl;

    for(; i < SIZE; i++)
    {
    randvalue[i] = rand () % 5 + 3; // random number between 3 to 7
    }
    cout << "Original array a [ ] = {";
    showArray(randvalue, SIZE);
    cout << "}" << endl;

    int j = SIZE-1;
    i = 0;

    while( i <= j)
    {
        swap(randvalue[i], randvalue[j]);
        i++;
        j--;
    }
    cout << "Reversed array a [ ] = {";
    showArray(randvalue, SIZE);
    cout << "}" << endl;
// ***********************************************
// Calling the function for max and min
    int returnMax = highest(randvalue, 25);
    cout << "Highest value is " << returnMax << endl;
    int returnMin = lowest (randvalue, 25);
    cout << "Lowest value is " << returnMin << endl;
// ***********************************************
// FUNCTION CALL FOR SUM
    int returnSum = sumArray (randvalue, 25);
    cout << "The sum of all array elements is " << returnSum << endl;
// ***********************************************
// Function call for AVERAGE
    float returnAvg = averageVal (randvalue, 25);
    cout << "The average of all array values is " << returnAvg << endl;
// ***********************************************
    return 0;
}

// Function definition for ARRAY
void showArray ( int a[ ], int size )
{
    int sum = 0;
    for(int i = 0; i < size; i++)
        cout << a[i];
}
// Function definition for LOWEST value
int  lowest ( int a[ ], int size )
{
    int min;
    min = a[0];

    for (int i = 0; i < size; i++)
    {
        if( a[i] < min) // if i-th element is less than min
        {
            min = a[i]; // make that our new min
        }
    }
    return min;
}

// Function definition for HIGHEST value
int highest ( int a[ ], int size )
{
    int max;
    max=a[0];

    for (int i = 0; i < size; i++)
    {
        if (a[i] > max)
        {
            max = a[i];
        }
    }
    return max;
}
// Function definition for SUM
int  sumArray ( int a[ ], int size )
{
    for (i=0; i< count; i++)
    {
        cout << numArray[i];
        if (i < count - 1)
            return
    }
}
// Function definition for AVERAGE
float averageVal ( int a[ ], int size )
{

}
// **********************************************

[jlb]

Why are you trying to pass the array into your average function?

You've already computed the sum, can't you just use that value to compute the average?

[Austinomical]

My sum does not even work.

[48T7M4Gy]

My sum does not even work.

No wonder if sumArray is supposed to get a total. :(

[48T7M4Gy]

http://www.cplusplus.com/forum/beginner/194887/

[Austinomical]

updated code. Got the sum to work, but I get errors for the average:

#include <time.h>
#include <iostream>
#include <stdlib.h>
using namespace std;

// Function prototypes
void showArray ( int a[ ], int size ); // shows the array in the format "int a [ ] = { 3, 7, 4, ... ,5, 6, 3, 4, 7 } "
void showReverse ( int a[ ], int size ); // shows the array in reverse using the format "int a [ ] = { 7, 4, 3, 6, 5, ... , 4, 7, 3 } "
int  lowest ( int a[ ], int size ); // finds and returns the lowest value in the array (should be 7)
int  highest ( int a[ ], int size ); // finds and returns the highest value in the array (should be 3)
int  sumArray ( int a[ ], int size ); // calculates and returns the sum of all values in the array
float averageVal ( int a[ ], int size ); // calculates and returns the average of all values in the array
// **************************************************************************************************************************************
int main ()
{
// Array and reverse array
    srand((int)time(NULL));
    int i=0;
    const int SIZE = 25;
    int randvalue[SIZE];


    cout << "Making an array of 25 random integers from 3 to 7!" << endl;

    for(; i < SIZE; i++)
    {
    randvalue[i] = rand () % 5 + 3; // random number between 3 to 7
    }
    cout << "Original array a [ ] = {";
    showArray(randvalue, SIZE);
    cout << "}" << endl;

    int j = SIZE-1;
    i = 0;

    while( i <= j)
    {
        swap(randvalue[i], randvalue[j]);
        i++;
        j--;
    }
    cout << "Reversed array a [ ] = {";
    showArray(randvalue, SIZE);
    cout << "}" << endl;
// ***********************************************
// Calling the function for max and min
    int returnMax = highest(randvalue, 25);
    cout << "Highest value is " << returnMax << endl;
    int returnMin = lowest (randvalue, 25);
    cout << "Lowest value is " << returnMin << endl;
// ***********************************************
// FUNCTION CALL FOR SUM
    int returnSum = sumArray (randvalue, 25);
    cout << "The sum of all array elements is " << returnSum << endl;
// ***********************************************
// Function call for AVERAGE
    float returnAvg = averageVal (randvalue, 25);
    cout << "The average of all array values is " << returnAvg << endl;
// ***********************************************
    return 0;
}

// Function definition for ARRAY
void showArray ( int a[ ], int size )
{
    int sum = 0;
    for(int i = 0; i < size; i++)
        cout << a[i];
}
// Function definition for LOWEST value
int  lowest ( int a[ ], int size )
{
    int min;
    min = a[0];

    for (int i = 0; i < size; i++)
    {
        if( a[i] < min) // if i-th element is less than min
        {
            min = a[i]; // make that our new min
        }
    }
    return min;
}

// Function definition for HIGHEST value
int highest ( int a[ ], int size )
{
    int max;
    max=a[0];

    for (int i = 0; i < size; i++)
    {
        if (a[i] > max)
        {
            max = a[i];
        }
    }
    return max;
}
// Function definition for SUM
int  sumArray ( int a[ ], int size )
{
   int sum=0;
   for(int count = 0; count < size; count++){
        sum = sum + a[count];
   }
    return sum;
}

// Function definition for AVERAGE
float averageVal ( int a[ ], int size )
{
    float avg = 0.0;
    for (int i = 0; i < size; ++i)
 {
     sum += a[count];
 }
     avg = ((float)sum)/size;
     return avg;

}
// ********************************************** 

[48T7M4Gy]

// Function definition for AVERAGE
float averageVal ( int a[ ], int size )
{
    return (float)sumArray(a, size)/size;
}

[Austinomical]

@Kemort Thanks, that fixed it!