Question

C++

please use only easy code and stdio.h because im just a beginner

Description Write the program that can manage the information of students as follows: S 1. This program has two phase; the input phase and the output phase. 2. In an input phase, a teacher inputs the information (name, score, and department) for each student. The total number of students who can be inputted should be defined as a NUM OF_STUDENT constant value. In this example, the value of NUM_OF_STUDENT is 7 3. The values of names, scores, and departments should satisfy the following requirements. (1) The names of students are the string values. The length of names is 19; in other words, you can enter 19 characters for a student's name at most. Assume that the name string does not have any white space such as a blank character (2) The scores of students are double type values. Obviously, the range of scores is [0, 1001, so it is okay if you don't check the validation of a user's input (3) The department is managed as an enumerated type. In the input phase, we focus on only 5 departments for the enumeration. Any other departments are considered as 'unknown (See the below for the departments with code numbers) department code number business 0 1 computer economics 2 mechanics 3 statistics 4 unknown other than 0-4 (4) All of these values should be located in a main function. Do NOT declare or assign them as global variables. Only the user-defined enumerated type for department code numbers can be defined outside of a main function. 4. Define the functions for storing the information in the input phase as follows: (1) The function get name gets the student's name. get name returns nothing but uses an array that stores the names of students as an output parameter (2) The function get score gets the student's score. get score returns nothing but uses an array that stores the scores of students as an output parameter (3) The function get_department has no parameter. This function takes an integer value as a user's input and returns it as a department code number. 5. After storing the information of all students, an output phase begins. There are two types of operations in the output phase; display all information, and display the average score by the department (1) Show total information when a user's input is 1. Meanwhile, compute the average score by the department if the user's input is 2 (2) Repeat the output phase during the user's input is 1 or 2. If the user enters other integer, the output phase ends and the whole program stops. 6. Define the functions for displaying the information in the output phase as follows: (1) The function total _information returns nothing. This function receives necessary data structures as parameters and displays the infomation of all students in the order in which they were entered. (See the screenshots for the details.) (2) The function average by_dept returns nothing. This function also receives necessary data structures as parameters. According to the department code number as a user's input, compute the average of students who are in that department. And, display the average with the number of students of that department and the total sum score of that department. (See the screenshots for the details.) (3) In the function average by dept, all the values of an average score, the number of students, and the total sum score are 0 if there is no student for the specific department whether the department code number is valid(0-4) or not. Likewise, the information of the department corresponding to the user's input code number should be calculated and displayed if there are one more students of the code number, even though the code number is invalid(less than 0 or greater than 4)

Answer 1

#include <iostream>
using namespace std;
const int NUM_OF_STUDENTS = 7;

/*
a 1 business
b 1 computer
c 2 business
d 3 economics
e 4 bla
f 5 mechanics
g 99 statistics
1
*/

//unknown is defined as 5
enum Department {business, computer, economics, mechanics, statistics, unknown};

void get_name(int index, string name, string (&names)[NUM_OF_STUDENTS]) {
names[index] = name;
}

void get_score(int index, double score, double (&scores)[NUM_OF_STUDENTS]) {
scores[index] = score;
}

void get_department(int index, string department, int (&departments)[NUM_OF_STUDENTS]) {
if (department == "business")
departments[index] = business;
else if (department == "computer")
departments[index] = computer;
else if (department == "economics")
departments[index] = economics;
else if (department == "mechanics")
departments[index] = mechanics;
else if (department == "statistics")
departments[index] = statistics;
else
departments[index] = unknown;
}

void total_information(string names[NUM_OF_STUDENTS], double scores[NUM_OF_STUDENTS], int departments[NUM_OF_STUDENTS]) {
for (int i = 0; i < NUM_OF_STUDENTS; i++) {
cout << "Student " << names[i] << " : " << "Score _ " << scores[i] << " Department _ " << departments[i] << endl;
}
}

void average_by_dept(int codeNumber, double scores[NUM_OF_STUDENTS], int departments[NUM_OF_STUDENTS]) {
double average;
double sum = 0;
int cnt = 0;
for (int i = 0; i < NUM_OF_STUDENTS; i++) {
if (departments[i] == codeNumber) {
sum += scores[i];
cnt++;
}
}
average = sum / (double)cnt;
cout << "Average of department " << codeNumber << " scores is : " << average << endl;
cout << "Sum of department " << codeNumber << " scores is : " << sum << endl;
}

int main()
{
string names[NUM_OF_STUDENTS];
double scores[NUM_OF_STUDENTS];
int departments[NUM_OF_STUDENTS];

cout << "Input NUM_OF_STUDENTS students' information : " << endl;
//Store information
for (int i = 0; i < NUM_OF_STUDENTS; i++) {
string name;
double score;
string department;
cin >> name >> score >> department;
get_name(i, name, names);
get_score(i, score, scores);
get_department(i, department, departments);
}

while (true) {
cout << "Input your choice : ";
int choice;
cin >> choice;
cout << endl;
if (choice == 1) {
total_information(names, scores, departments);
}
else if (choice == 2) {
cout << "Input department name : ";
string department;
cin >> department;
cout << endl;
int codeNumber;
if (department == "business")
codeNumber = business;
else if (department == "computer")
codeNumber = computer;
else if (department == "economics")
codeNumber = economics;
else if (department == "mechanics")
codeNumber = mechanics;
else if (department == "statistics")
codeNumber = statistics;
else
codeNumber = unknown;
average_by_dept(codeNumber, scores, departments);
}
else {
break;
}
}

return 0;
}

Input NUM_OF_STUDENTS students' information a 1 business b 1 computer c 2 business -d 3 economics e 4 bla f 5 mechanics g 99 statistics Input your choice : 1 Student a Score 1 Department 1 Department 2 Department 3 Department 4 Department 5 Department Score 99 Department 0 Student b: Score 1 Student c : Score 0 Student d : Score 2 Student e : Score 5 Student f Score Student g : Input your choice : 2 3 4 Input department name : business Average of department 0 scores is : 1.5 Sum of department 0 scores is : 3 Input your choice : 3 : 32.682 s Process returned 0 (Ox0) Press any key to continue. execution time

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