Using functions for same output

[tetsuuuu]

I was hoping to get an explanation on where to begin on changing the following code to be used with functions. I tried many things but everything seems to not compile.

If any of you can point me to the right direction it would really help. I am only a month and half into my C++ class and have a hard time understanding my professor because I am ESL.

This is the original code that I had no problem writing.

#include<iostream>
using namespace std;
int main()
{
	int numGrades;
	double grade[100], sum = 0, average, max, min;
 
 	cout << "\nHow many grades do you have? ";
 	cin >> numGrades;
 	cout << "\nList your grades: " << endl;

 	for(int i = 1; i <= numGrades; i++)
 	{
 		cout << "Grade " << i << endl;
 		cin >> grade[i];
 		sum += grade[i];
 	if(i==1)min=max=grade[i]; //1st grade set to min max
 	else if( grade[i] > max)
	{
 		max = grade[i]	;//updates the minmax
 	}
 	else if( grade[i] < min)
 	{
 		min = grade[i] ;
 	}
	
	}
 

 average = sum / numGrades;
 cout<< "\nYour average is = "<< average;
 cout<< "\nYour highest grade is = "<< max
 	 << "\nYour lowest grade is = "<< min;

 	
cout << "\n\n";
return 0;	
}

What my assignment is telling me to do is write out the same thing using functions.
**In my next post**

[tetsuuuu]

#include<iostream>
using namespace std;
int grades[100] ;
int n ;

void getgrades() ;
void minimum() ;
void maximum() ;
void average() ;

int main()
{cout << "\nHow many grades do you have? ";
 cin >> n ;
 getgrades() ;
 minimum() ;
 maximum() ;
 average() ;
 
 cout << "\n\n" ;
 return 0;
}

I tried to simply copy and paste the code from the original and separate into each function but it does not work.

[jonnin]

well, making stuff global is not the way to go. lets give average a try...

double avg (double* grades, int numgrades) //pass data into functions, do not rely on globals to bypass this. 
{
     double sum = 0;
     for (int x = 0; x < numgrades; x++)
     sum += grades[x];
     return (sum/numgrades);
}

…
in main..
...
average = avg(grade, numGrades);
…