fghjk

#include <iostream>

using namespace std;

int main() {
    int students = 0;
    double average = 0;
    int currentmark = 0;
    int totalmark = 0;
    int highestmark = 0;
    int lowestmark = 1000;
    int aS = 0;
    int bS = 0;
    int cS = 0;
    int fS = 0;
    cout << "Enter the amount of students: ";
    cin >> students;
    cout << "\n\n\n";
    for(int i = 1; i <= students; i++) {
       cout << "Enter student #" << i << " mark: ";
       cin >> currentmark;
       if(currentmark > highestmark) {
           highestmark = currentmark;
       }
       if(currentmark < lowestmark) {
           lowestmark = currentmark;
       }
       totalmark += currentmark;
       if(currentmark <= 100 && currentmark >= 80) {
           aS++;
       } else if(currentmark <= 79 && currentmark >= 70) {
           bS++;
       } else if(currentmark <= 59 && currentmark >= 50) {
           cS++;
       } else if(currentmark < 50) {
           fS++;
       } else if(currentmark < 0 || currentmark > 100) {
           cout << "\nInvalid mark!";
       }
    }
    average = totalmark / students;
    cout << "-----------------------\n";
    cout << "CLASS REPORT:\n";
    cout << "-----------------------\n\n";
    cout << "Number of Students: " << students << "\n";
    cout << "Class Average: " << average << "\n";
    cout << "Highest Mark: " << highestmark << "\n";
    cout << "Lowest Mark: " << lowestmark << "\n";
    cout << "\nNumber of A's: " << aS << "\n";
    cout << "Number of B's: " << bS << "\n";
    cout << "Number of C's: " << cS << "\n";
    cout << "Number of F's: " << fS << "\n";
    system("PAUSE");
    return 0;
}