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Need help finding the average of grades.

EternalTactician (52)
I have 3 students in a row and 5 grades for every student in a column.I needed the class average which i already found but i still need to find the average for individual student. I don't know how to begin and need help with that.

Following is my code so far

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

const int R=3; //number of rows
const int C=5; //number of coloumn
const int N=15;

void showNamesAndScores(int scores[][C], char names[][N], int);

double calcAvg(int X[][C], int);

char classAvg(int X[][C], int);


double calcAvg(int X[][C], int s)
{
	double a;

	double sum = 0;
	for(int i=0; i<R; i++)
	{
		for(int j=0; j<C; j++)
		{
			sum += X[i][j];
		}
	}

	a = sum/(R*C);

	return a;

}

char classAvg(int scores[][C], int R)
{
	double avg;

	int sum = 0;
	char grade;
	for(int i=0; i<R; i++)
	{
		sum += scores[i][C];

	}
	avg = sum/R;



}




int main()
{





	//declare 2d array
	int scores[R][C];
	char names[R][N];

{



	//populate 2d array
	for(int i=0; i<R ;i++)
	{
		cout<<"Enter Name of student"<<i+1<<": ";
		cin>>names[i];
		cout<<endl;
	}
	for(int i=0; i<R; i++)
	{
		cout<<"Enter "<<C<<" scores for student "<<i+1<<": ";
		for (int j=0; j<C; j++)
		{
			cin>>scores[i][j];
		}
		cout<<endl;

	}





	showNamesAndScores(scores, names, R);

	//endcalcAvg

	double avg = calcAvg(scores, R);

	cout<<"Class Avg: "<<avg<<endl;





}


}


	//end of main


void showNamesAndScores(int scores[][C], char names[][N], int R)
{
	for(int i=0; i<R; i++)
	{
		cout<<names[i];
		cout<<setw(15);
		for(int j=0; j<C; j++)
		{
			cout<<scores[i][j]<<" ";

		}
		cout<<endl;


	}

}//end names and scores
Jikax (236)
You ging in the right direction...
But i would make a single function to use for both averages:

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double calcAvg( int * arr , int size )
{
  long sum =0;
  for(int i =0;i<size;i++)
  {
    sum += arr[i];
  }
  return (sum / size);
}

double classAvg( int **arr , int rows, int columns )
{
  long sum = 0;
  for ( int i=0; i<rows;i++)
  {
     sum += calcAvg( arr[i] , columns );
  }
  return (sum / rows);
}


It is not tested...so if in doesn't work i am glad to help....
Last edited on
EternalTactician (52)
Its not really working..
Jikax (236)
what does not work? I do not have a pc nearby.. I am using a tablet..
Last edited on
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