Answer to Question #295392 in C++ for Anamika

Question

A program to declare a class student whose data members are student name,marks of 3 subject,total and average and two static data members pass and fail and members functions are-

1 get()to get student name and marks of three subject

2 calc() to Calculate total and avg and also calculate how many student are pass and fail (avg>=40,pass otherwise fail)

3 disp()to display all data members except pass and fail

4 result ()to display total no.of pass and fail student it is a static function

In main(),get details 5 students

Answer 1

#include <iostream>
#include <string>
#include <iomanip>
using namespace std;


class Student {
    string name;
    int marksEnglish;
    int marksMath;
    int marksScince;
    int total;
    double average;
    static int pass;
    static int fail;


public:
    Student(string name);
    void get();
    void calc();
    void disp();
    static void result();
};


int Student::pass = 0;
int Student::fail = 0;


Student::Student(string name) {
    this->name = name;
    marksEnglish = marksMath = marksScince = total = 0;
    average = 0.0;
}


void Student::get() {
    cout << "Enter marks for " << name << endl;
    cout << "English: ";
    cin >> marksEnglish;
    cout << "Math: ";
    cin >> marksMath;
    cout << "Science: ";
    cin >> marksScince;
}


void Student::calc() {
    total = marksEnglish + marksMath + marksScince;
    average = total / 3.0;
    if (average >= 40) {
        pass++;
    }
    else {
        fail++;
    }
}


void Student::disp() {
    cout << "Results of student " << name << endl;
    cout << "English: " << marksEnglish << endl;
    cout << "Math:    " << marksMath << endl;
    cout << "Science: " << marksScince << endl;
    cout << "Totla:   " << total << endl;
    cout << "Average: " << fixed << setprecision(2) << average << endl;
}


void Student::result() {
    int n = pass + fail;
    double pr_pass = static_cast<double>(pass) / n * 100;
    double pr_fail = static_cast<double>(fail) / n * 100;


    cout << fixed << setprecision(2) << pr_pass << "% students pass; "
         << setprecision(2) << pr_fail << "% students fail" << endl;
}


int main() {
    Student students[5] = { Student("John Snow"),
                            Student("Adam Smith"),
                            Student("Mary Brown"),
                            Student("Alice Bloom"),
                            Student("Bill Gates") };


    for (int i=0; i<5; i++) {
        students[i].get();
        cout << endl;
    }


    for (int i=0; i<5; i++) {
        cout << endl;
        students[i].calc();
        students[i].disp();
    }


    Student::result();


    return 0;
}