Question

Need the solutions for the following problem from Starting out with C++: From Control Structures Through Objects - 8th edition

CH.11 Page 651 Programing challenges #12

Please send the solution codes to [email protected] if you can.

Answer 1

#include <iostream>

using namespace std;

const int columns = 4;

struct StuDent //user defined datatype

{

        int id[6];

        char names[6][20];

        int scores[6][4];

        double avg[6];

        char grade[6];

}; //semi-colon required

//pass by reference

void calculateAverage(StuDent&);

char letterGrade(StuDent&);

int main()

{

        const int rows = 6;

       

        //declare and allocate

        StuDent r;

       

        //enter student id

        cout<<"Student id: ";

               for(int i=0; i<6 ;i++)

        cin>>r.id[i];

       

       

        //enter student+scores

        for(int i=0; i<6 ;i++)

        {

               cout<<"Enter Name of student "<<i+1<<": ";

               cin>>r.names[i];

               cout<<endl;

        }

        for(int i=0; i<rows; i++)

        {

               cout<<"Enter "<<columns<<" scores for student "<<i+1<<": ";

               for (int j=0; j<columns; j++)

               {

                       cin>>r.scores[i][j];

               }

               cout<<endl;

        }

       

        //display

        cout<<"Student id: "<<r.id<<endl;

        cout<<"Scores: ";

        for(int i=0; i<4 ; i++)

               cout<<r.scores<<" ";

        cout<<endl;

       

        //compAvg

       

        calculateAverage(r);

       

        cout<<"Avg Score: "<<r.avg<<endl;

       

        letterGrade(r);

       

        cout<<"Letter Grade: "<<r.grade<<endl;

       

}//endmain

void avg(StuDent& r)

{

       

        int sum=0;

        for(int i=0; i<6 ; i++)

               sum+=r.scores[columns][i];

        r.avg=static_cast<double>(sum)/4;

                                         //error: incompatible types in

                                        //assignment of 'double' to 'double [6]'

                                       //

}

char grade(StuDent& r)

{

        int sum = 0;

        char grade;

        for(int j=0; j<6; j++)

        {

               sum += r.scores[columns][j];

        }

        double avg = sum/4;

        cout<<"Avg: "<<avg;

       

        if(avg >= 90)

               grade = 'A';

        if(avg >= 80 && avg < 90)

               grade = 'B';

        if(avg >= 70 && avg < 80)

               grade = 'C';

        if(avg >= 60 && avg < 70)

               grade = 'D';

        if(avg < 60)

               grade = 'F';

       

        return grade;

}