Introduction to C++ Lab 4

lab_4.cpp

/* Lab 4 Solution by Dillon Morse
 * ------------------------------
 * Generate four random number grades between 1 and 100. Then, drop the lowest
 * grade and issue a letter grade, rounding up.
 */

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;

int main() {
  int rnd;
  int grade;
  int scores[4];
  int final_scores[3];
  int i;
  int min = 100;
  int sum = 0;
  string letter_grade;
  bool reached_min;

  srand(time(NULL));

  for(i = 0; i < 4; i++) {
    scores[i] = rand() % 99 + 1;
    if(scores[i] < min) min = scores[i];
  }

  for(i = 0; i < 4; i++) {
    if(scores[i] > min) {
      // Makes it possible to record numbers to the proper point in the array
      // after the minimum value is reached
      if(reached_min) {
        final_scores[i - 1] = scores[i];
      } else {
        final_scores[i] = scores[i];
      }
    } else {
      reached_min = true;
    }
  }

  for(i = 0; i < 3; i++) {
    sum = sum + final_scores[i];
  }

  grade = static_cast<int>(sum / 3);

  // Since the greater than operator is supplied by the previous if statement,
  // I can get away without any or operators.
  if(grade < 60) {
    letter_grade = "F";
  } else if(grade < 70) {
    letter_grade = "D";
  } else if(grade < 80) {
    letter_grade = "C";
  } else if(grade < 90) {
    letter_grade = "B";
  } else {
    letter_grade = "A";
  }

  // Useful for debugging
  // --------------------
  // for(i = 0; i < 3; i++) {
  //   cout << final_scores[i] << '\n';
  // }

  cout << "Your grade is " << letter_grade << '\n';

  // Necessary to avoid errors using some compilers
  return 0;

  // Necessary if you aren't using a CLI for output
  // ----------------------------------------------
  // system("PAUSE")
}