pf-assignment-04.cpp

//usr/bin/g++
#include <iostream>

int main() {
  const int S = 5, M = 6, max = 1000;
  int subjects[S][M], avg[S], sum = 0;
  char students[S][max];

  // Read the mark for students.
  for (int i = 0; i < S; i++) {
    std::cout << "Enter name of Student #" << i + 1 << " : ";

    //The extraction operations leave the trailing '\n' character in the stream. On the other hand, istream::getline() discards it. So when you call getline after an extraction operator, '\n' is the first character it encounters and it stops reading right there. so we need to call cin.ignore().
    std::cin.ignore();
    
    std::cin.getline(students[i], max);
    for (int j = 0; j < M; j++) {
      std::cout << "Enter mark of subect #" << j + 1 << " : ";
      std::cin >> subjects[i][j];
    }
  }

  // Getting average marks.
  for (int i = 0; i < S; i++) {
    for (int j = 0; j < M; j++) {
      sum = sum + subjects[i][j];
    }
    avg[i] = sum / 6;
  }

  // Printing...
  for (int i = 0; i < S; i++) {
    if (avg[i] >= 90) {
      std::cout << "A: " << students[i] << std::endl;
    } else if (avg[i] >= 75 && avg[i] < 90) {
      std::cout << "B: " << students[i] << std::endl;
    } else if (avg[i] >= 65 && avg[i] < 75) {
      std::cout << "C: " << students[i] << std::endl;
    } else if (avg[i] >= 50 && avg[i] < 65) {
      std::cout << "D: " << students[i] << std::endl;
    } else {
      std::cout << "Failed: " << students[i];
    }
    std::cout << std::endl;
  }

  return 0;
}