Question

C++,

I am tried to make this exercise:


2) Write a program and declare an array called “Exam” with 100 integers. Hence, ask a lecturer to enter the number of students in a class along with each student’s mark that should be stored in the array (use a variable n to know the number of students). The program should then calculate and display:
a) the average (float) and the highest and lowest marks of the class,
b) the number of grades A, B, C, D and F, according to the following table.


There is something wrong with the code I just don't understand what it is?
http://pastebin.com/14nZDb5A

Answer 1

hard to help if the pastebin is removed.

Answer 2

Sorry I re-added it !!

Answer 3

use Exam[100] not Exam(100) Exam(100) means you are inputting argument 100 to function Exam() while int Exam[100]; means you are declaring an array of type int with size 100

Answer 4

ooh I see

Answer 5

You may want to make sure that the user doesn't input a number bigger than the length of your student array.

To gather the As, Bs, Cs, Ds and Fs, I would have an array to count them. It's also pretty simple to output. You may want to use a switch statement for collection.

Don't forget that you can assign a value to a variable when you declare it. Many people recommend doing this so that they'll have known values instead or (somewhat) random garbage values.

Answer 6

And from a programming standpoint, globals are a bad idea.

```
#include <iostream>
using namespace std;

int Exam[100];
int n;
float average;
int highest;
int lowest;
int Students;
int Grade;
int i;
int GradeSum=0;
int Average;
bool FirstTime;
bool FirstTime2;

int main()

{
```
Those are globals.

```
#include <iostream>
using namespace std;

int main()
{
int Exam[100];
int n;
float average;
int highest;
int lowest;
int Students;
int Grade;
int i;
int GradeSum=0;
int Average;
bool FirstTime;
bool FirstTime2;
```
That changes them to local.