Array

[Chubby]

I have to question about an array:

How do you stop at 3 and calculate the avg and then keeping moving.

Since in a file there are 15 num. each student have 3 test and i need to calculate the per student avg

[keskiverto]

You make it sound like that the file doesn't have 15 numbers, but five groups of three numbers. Therefore, you should read one group at a time.

[j3Rz8vqX]

Use an algorithm that includes a counter and condition it to calculate an average whenever the counter reaches 3 or more; reset counter afterwards.

My assumption is that you are reading from a file.

counter=sum=number=0;
Loop
---read number
---counter++;//counting from 0 to 2; 3 == reset;
---if(counter>2)
------calculate average of sums;
------sum=0;//reset sum;
---else
------sum = sum + number;//The one read

[Chubby]

If you reset number, it will count same? Like 123 stop and then 123 again? It should 456 n 789

[j3Rz8vqX]

Design from web and implementation may require some alterations, but something of this sort:

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
const int mySize = 15;
const int myStop = 3;
void fillArray(int *&myFakeFile)
{
    for(int i=0;i<15;i++)
    {
        myFakeFile[i] = rand()%10;//Fill the array with dummy data, for demonstration;
    }
}
void impliedTask(int *&myFakeFile,float *&avg)
{
    int sum=0;
    cout<<"===Start==="<<endl;
    for(int i=0,j=0;i<mySize;i++)
    {
        cout<<endl;
        cout<<"Number @index["<<i<<"] is: "<<myFakeFile[i]<<endl;
        sum+=myFakeFile[i];//accumulate sum
        cout<<"Sum @index["<<i<<"] is: "<<sum<<endl;
        if(j>=myStop-1)//stop to make adjust if j counter >=2 (0,1,2) == 3 numbers
        {
            avg[i/myStop] = float(sum)/float(myStop);//insert avg into index i/3
            cout<<"Average @index["<<i/myStop<<"] is: "<<float(int(10*avg[i/myStop]))/10<<endl;
            j=sum=0;//reset j counter and sum
        }
        else
        {
            j++;
        }
    }
}

int main ()
{
    srand(time(0));
    int *myFakeFile = new int[mySize];
    float *avg = new float[mySize/myStop];

    fillArray(myFakeFile);
    impliedTask(myFakeFile,avg);

    delete []avg;
    delete []myFakeFile;
    return 0;
};

In your case, you'd be reading from file; my assumption.

[CodingisFun]

yes thank you tips