Can anyone fix this code for me? An error accures when calculating the average s

Question

Can anyone fix this code for me? An error accures when calculating the average score. The problem is from Starting out with C++ Ch11 PC12.

#include <iostream>
using namespace std;

const int columns = 4;

struct StuDent

{

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;

}

Explanation / Answer

use double r.avg=(double)((sum)/4);

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