I posted this question, and someone answered, but there is an erroer and nobody
ID: 3830703 • Letter: I
Question
I posted this question, and someone answered, but there is an erroer and nobody correct it. Therefore, I am going to post it again, and I hope that I will get the correct answer.
IT MUST BE IN C++
Chapter 11, Programming Challenge 12: Course Grade
Write a program that uses a structure to store structure data as describe in
Program template:
#include <iostream>
#include <string>
#include <cstdlib>
#include <iomanip>
using namespace std;
// Declaration of Student structure
struct Student
{
// TODO: structure for
// 1) Student name,
// 2) Student ID number,
// 3) Pointer to array of test scores
// 4) Average test score
// 5) Course grade
};
// Function prototypes
Student *initArrays(int, int);
void getInfo(Student[], int, int);
void showInfo(Student[], int, int);
int main()
{
int numStudents; // Number of students
int numTests; // Number of tests
Student *list = nullptr; // Pointer to Student array
// Get the number of students.
cout << "How many students? ";
cin >> numStudents;
// Get the number of tests per student.
cout << "How many tests per student? ";
cin >> numTests;
// TODO: Create an array of Students
list = initArrays(numStudents, numTests);
// TODO: Populate the array with data.
getInfo(list, numStudents, numTests);
// TODO: Display the data.
showInfo(list, numStudents, numTests);
return 0;
}
//**************************************************
// Function initArrays *
// This function dynamically allocates an array *
// of Student structures and for each element in *
// the array, allocates an array of ints to hold *
// tests scors. The parameter s is the number of *
// element to allocate for the array of structures *
// and the parameter t is the number of elements *
// allocate for each array of ints. *
//**************************************************
Student *initArrays(int s, int t)
{
Student *ptr = nullptr;
// Allocate the array of Student structures.
ptr = new Student[s];
// TODO: Allocate an array of ints (to hold test scores)
// for each element of the array of Student structures.
// Return a pointer to the array of structures.
return ptr;
}
//*****************************************************
// Function getInfo *
// This function populates the Student array s with *
// data entered by the user. The paramater ns is the *
// number of students and nt is the number of tests. *
//*****************************************************
void getInfo(Student s[], int ns, int nt)
{
int total;
//TODO: Get the data for each student.
}
Explanation / Answer
Try this code:
#include <iostream>
#include <string>
#include <cstdlib>
#include <iomanip>
using namespace std;
// Declaration of Student structure
struct Student
{
// TODO: structure for
// 1) Student name,
string name;
// 2) Student ID number,
int ID;
// 3) Pointer to array of test scores
int* testScores;
// 4) Average test score
double avgTest;
// 5) Course grade
char grade;
};
// Function prototypes
Student *initArrays(int, int);
void getInfo(Student[], int, int);
void showInfo(Student[], int, int);
int main()
{
int numStudents; // Number of students
int numTests; // Number of tests
Student *list = nullptr; // Pointer to Student array
// Get the number of students.
cout << "How many students? ";
cin >> numStudents;
// Get the number of tests per student.
cout << "How many tests per student? ";
cin >> numTests;
// TODO: Create an array of Students
list = initArrays(numStudents, numTests);
// TODO: Populate the array with data.
getInfo(list, numStudents, numTests);
// TODO: Display the data.
showInfo(list, numStudents, numTests);
return 0;
}
//**************************************************
// Function initArrays *
// This function dynamically allocates an array *
// of Student structures and for each element in *
// the array, allocates an array of ints to hold *
// tests scors. The parameter s is the number of *
// element to allocate for the array of structures *
// and the parameter t is the number of elements *
// allocate for each array of ints. *
//**************************************************
Student *initArrays(int s, int t)
{
Student *ptr = nullptr;
// Allocate the array of Student structures.
ptr = new Student[s];
// TODO: Allocate an array of ints (to hold test scores)
// for each element of the array of Student structures.
for(int i = 0; i < s; i++)
ptr[i].testScores = new int[t];
// Return a pointer to the array of structures.
return ptr;
}
//*****************************************************
// Function getInfo *
// This function populates the Student array s with *
// data entered by the user. The paramater ns is the *
// number of students and nt is the number of tests. *
//*****************************************************
void getInfo(Student s[], int ns, int nt)
{
int total;
//TODO: Get the data for each student.
for(int i = 0; i < ns; i++)
{
cout << "Enter the name of student # " << i+1 << ": ";
cin >> s[i].name;
cout << "Enter the ID of student # " << i+1 << ": ";
cin >> s[i].ID;
cout << "Enter " << nt << " test scores: ";
for(int j = 0; j < nt; j++)
{
cin >> s[i].testScores[j];
while(s[i].testScores[j] < 0 || s[i].testScores[j] > 100)
{
cout << "Test scores should be in range [0 - 100]" << endl;
j--;
s[i].testScores[j] = 0;
}
total += s[i].testScores[j];
}
s[i].avgTest = (double)total / nt;
if(s[i].avgTest > 90)
s[i].grade = 'A';
else if(s[i].avgTest > 80)
s[i].grade = 'B';
else if(s[i].avgTest > 70)
s[i].grade = 'C';
else if(s[i].avgTest > 60)
s[i].grade = 'D';
else
s[i].grade = 'F';
}
}
//*****************************************************
// Function showInfo *
// This function displays all of the data in the *
// array s. The paramater ns is the number of *
// students and nt is the number of tests. *
//*****************************************************
void showInfo(Student s[], int ns, int nt)
{
// TODO: Displays all of the data in the array s
for(int i = 0; i < ns; i++)
{
cout << "Name: " << s[i].name << endl;
cout << "ID: " << s[i].ID << endl;
cout << "Test scores: ";
for(int j = 0; j < nt; j++)
cout << s[i].testScores[j] << " ";
cout << endl;
cout << "Average: " << s[i].avgTest << endl;
cout << "Grade: " << s[i].grade << endl;
}
}