//Selection.h

#include #include using namespace std; typedef struct Student { int roll_no; string name; double marks[5]; double percentage; }Student;

// calculate percentage for student void Percentage(Student* Array, int length) { // local variable double total; // loop till the end of the array for (int i = 0; i < length; i++) { // assign total = 0 total = 0; // loop through all the marks of the students for (int j = 0; j < 5; j++) { // calculate the total total = total + Array[i].marks[j]; } // calculate the average and store in percentage Array[i].percentage = total / 5; } }

// selection sort (descending order) void selectionSort(Student* Array, int length) { // local variabes int MAX = 0; Student temp; // loop till the end of the array for (int i = 0; i < length; i++) { // assign value of 'i' index to MAX MAX = i; // loop till (n-i) for (int j = i + 1; j < length; j++) { // compare the percentage if (Array[j].percentage > Array[MAX].percentage) // assign value of 'j' index MAX (if more than) MAX = j; } // swapping numbers temp = Array[i]; Array[i] = Array[MAX]; Array[MAX] = temp; } } // selection sort (descending order) void selectionSortMarks(double* Array, int length) { // local variabes int MIN = 0; double temp; // loop till the end of the array for (int i = 0; i < length; i++) { // assign value of 'i' index to MAX MIN = i; // loop till (n-i) for (int j = i + 1; j < length; j++) { // compare the percentage if (Array[j] < Array[MIN]) // assign value of 'j' index MAX (if more than) MIN = j; } // swapping numbers temp = Array[i]; Array[i] = Array[MIN]; Array[MIN] = temp; } }

//main.cpp

#include #include #include #include "selection.h" using namespace std;

int main() { Student student[5]; // accepting marks for 5 students cout << "Enter 5 student details "; cout << endl; for (int i = 0; i < 5; i++) { cout << endl; cout << "Enter student roll no : "; cin >> student[i].roll_no; cin.ignore(std::numeric_limits::max(), ' '); cout << "Enter student name : "; getline(cin, student[i].name); cout << endl; for (int j = 0; j < 5; j++) { cout << "Enter marks for subject " << j + 1 << " : "; cin >> student[i].marks[j]; } } // calculate percentage Percentage(student, 5); for (int i = 0; i < 5; i++) { selectionSortMarks(student[i].marks, 5); } // sort students based on overall percentage

selectionSort(student, 5); cout << endl; cout << "Sorted (Descending order) as per percentage of the students" << endl; // printing the details of the students for (int i = 0; i < 5; i++) { cout << "Student Roll No :" << student[i].roll_no << endl; cout << "Student Name :" << student[i].name << endl; for (int j = 0; j < 5; j++) { cout << "Subject " << j + 1 << " : " << student[i].marks[j] << endl; } cout << "Student percentage :" << std::fixed << setprecision(2) << student[i].percentage << endl; cout << endl; }

return 0; }

Why Im getting error (identifier "getline" is undefined) for this coding.

And please explain why selection sorting is best fit over insertion sort to obtain this output