Array problems, need help!

[sosupin]

I'm having troubles with calculating the new score and calculating and displaying the difference between each new score and the average of new scores.
we learned arrays yesterday and i feel completely lost.

I got some of the new score calculated but its coming out completely wrong and i dont even know how to start to calculate and display the difference between each new score and the average of new scores.

  #include <iostream>

using namespace std;

int main()
{
    //Write a program that uses an integer array to store 12 test scores that a user enters
    int a[12];
    int i=0;
    
    cout << "Please enter the scores: ";

        for(i=0;i<12;i++)
        {
            cin>>a[i];
        }
        
    //Calculates the highest score
    int max=a[0];
    for(i=0;i<12;i++)
        
    {
        if(a[i]>max)
            max=a[i];
    }
    
    cout << "The highest score is: ";
    cout << max << endl;
    
//Use following formula to calculate and display the new scores:
//original score/highest score * 100, only display the whole number part of the new score

    int newScore;
    
    newScore=(a[i])/(max)*100;
    
    cout << newScore << endl;

    int sum=0;
    for(i=0;i<12;i++)
        sum+=a[i];

    cout << "The average is: " << sum/30;

//Calculate and display the difference between each new score and the average of new scores.

    return 0;
}

[Peppercorn142]

#include <iostream>

using namespace std;

int main()
{
	//Write a program that uses an integer array to store 12 test scores that a user enters
	int AllScores[12];
	int i = 0;

	// Output message asking user to enter the scores
	cout << "Please enter the scores. \n";
	for (int i = 0; i < 12; ++i)
	{
		// User inputs a score.
		cout << "Input: ";
		cin >> AllScores[i];
		cout << endl;
	}

	//Calculates the highest score
	int max = 0;
	for (int i = 0; i < 12; ++i)

	{
		// If the value stored in array is larger than
		// current max, then change max to new max value.
		if (AllScores[i] > max)
			max = AllScores[i];
	}

	cout << "The highest score is: ";
	cout << max << endl;

	//Use following formula to calculate and display the new scores:
	//original score/highest score * 100, only display the whole number part of the new score

	float newScore = 0;
	for (int i = 0; i < 12; ++i)
	{
		// Note that dividing the same score will result in 1 and * 100 means 1*100 = 100
		newScore = ((AllScores[i]) / (max)) * 100;
		cout << "New Score [" << (i + 1) << "]: " << newScore << endl;
	}

	int sum = 0;
	for (int i = 0; i < 12; ++i)
		sum += AllScores[i];

	// Final Output
	cout << "The average is: " << (sum / 12) << endl;
	// Wait for user to press any of the character or return keys
	system("pause");
	//Calculate and display the difference between each new score and the average of new scores.
	return 0;
}

One Thing I noticed is that you weren't specifying the type for "i" in your for loops.
Try this out, I didn't try to compile it though, but most likely works.

[sosupin]

Ehh i cant use some of those terms like system
We have not learned it. its basically the first lesson of Arrays.

[Peppercorn142]

You could take out the system("pause"); then, it's only keeping the console open until you press a key.

The information will still show up in the Output window though incase you do mind about keeping the Console window open.

[MikeyBoy]

Look at line 35:

    newScore=(a[i])/(max)*100;

What is the value of i going to be at this point?

Having worked that out, what is the value of a[i] going to be?

[Peppercorn142]

That would be the scores input into the array you created.

Since you're in a for() loop, and you defined int i = 0, the i would be whatever iteration of i is at that point and since you're only iterating by 1 each time it would be.

for(int i = 0; i < 12; ++i)
{
    newScore = (a[i] / max) * 100;
    // What i would look like in each loop run
    // i = 0, i = 1, i = 2, i = 3, i = 4 ... i = 11
    
    // Lets say that our first number is the max number "500"
    // newScore = (a[0] / max) * 100
    // newScore = (500 / 500) * 100;
    // newScore = 1 * 100;
    // newScore = 100;
}

Edit** I just read the name of who posted that question, lol... Sorry MilkeyBoy

[MikeyBoy]

Edit** I just read the name of who posted that question, lol... Sorry MilkeyBoy

No worries - and it was kind of a rhetorical question, trying to point the OP to where there's a problem, and what the nature of the problem is.