259201 Lab11

#include <iostream>         //for using standard i/o functions
#include <cmath>            //for using math functions
#include <cstdlib>          //for using rand functions
#include <ctime>            //for using a time function

using namespace std;

#define n 10                //declaring n is 10

/* Finding Average Functions
Input: n scores
Output: An average score*/
float favg (int score[n])
{
    float sum = 0;                    //sum of scores

    for ( int i = 0 ; i < n ; i++ )
    {
        sum += score[i];
    }

    return sum/n;
}

/* Finding SD Functions
Input: An average score and scores
Output: A SD*/
float fsd (float avg,int score[n])
{
    float sum = 0;                    //sum of scores minus average score

    for ( int i = 0 ; i < n ; i++ )
    {
        sum += pow((score[i] - avg),2);
    }

    return sqrt(sum/n);
}

/* Finding Grade From Score
Input: A score and multipliers
Output: A grade */
char fgrade (int score, float mul[3], float avg, float sd)
{
    char grade;

    if( score >= avg+(mul[0]*sd) && score <= 10 )
    {
        grade = 'A';
    }
    else if ( score >= avg+(mul[1]*sd) )
    {
        grade = 'B';
    }
    else if ( score >= avg+(mul[2]*sd) )
    {
        grade = 'C';
    }
    else
    {
        grade = 'F';
    }

    return grade;
}

int main ()
{
    char lc;                                //declaring a loop control
    float mul[] = { 1.2 , 0.6 , -1 };        //declaring default multipliers
    do
    {
        int score[n];
        char grade[n];
        int gc[] = {0,0,0,0};               //declaring grade counters that gc[0] is an A counter , so gc[3] is an F counter

        cout<<"--------------------------------------"<<endl<<"Score(grade): ";

        srand(time(NULL));                      //gen a seed using current time
        for ( int j = 0 ; j < n ; j++)
        {
            score[j] = rand() % (n+1);          //declaring random scores that is between 0 - n
        }

        float avg = favg(score);
        float sd = fsd(avg,score);

        for( int i = 0 ; i < n ; i ++)
        {
            grade[i] = fgrade(score[i],mul,avg,sd); //finding grade
            cout<<score[i]<<"("<<grade[i]<<"),";
            switch(grade[i])
            {
                case 'A':
                    gc[0]++;
                    break;
                case 'B':
                    gc[1]++;
                    break;
                case 'C':
                    gc[2]++;
                    break;
                default:
                    gc[3]++;
            }
        }

        cout<<endl<<"Grade count: A("<<gc[0]<<"), B("<<gc[1]<<"), C("<<gc[2]<<"), F("<<gc[3]<<")"<<endl;
        cout<<"GPA: "<<((gc[0]*4)+(gc[1]*3)+(gc[2]*2))/n<<",\tAverage: "<<avg<<",\tSD: "<<sd<<endl;
        cout<<"Do you want to modify multipliers (y/n): ";
        cin>>lc;

        if( lc == 'y' || lc == 'Y' )
        {
            cout<<"Enter new multipliers (default: 1.2 0.6 -1 ): ";
            cin>>mul[0]>>mul[1]>>mul[2];
        }

        cout<<endl;

    }   while( lc != 'n' || lc != 'N' );

    return 0;
}