Overall Average Grade Solver in C++

 A simple overall average grade solver that I wrote using C++ programming language. I am using codeblocks to run my program.

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Program Listing

#include <iostream>

#include <iomanip>

#include <cmath>

#include <string>

#define EXIT_IF(cnd, msg) if(cnd){std::cerr << msg; exit(1);}

std::string get_performance(double grade)

{

if (grade < 70)

return "Poor";

else if(grade <= 74)

return "For Improvement";

else if (grade <= 80)

return "Good";

else if (grade <= 90)

return "Very good";

else

return "Excellent";

}

int main()

{

constexpr int num_grades = 5;

int num_students = 0, student, grade;

double sum , total_sum = 0.0;

std::cout << "Number of students in the class? ";

std::cin >> num_students;

std::cin.ignore(255, '\n');

EXIT_IF(num_students < 0, "Invalid Input: Please enter a nonnegative integer.");

for (student = 0; student < num_students; ++student)

{

sum = 0.0;

for (grade = 0; grade < num_grades; ++grade)

{

std::cout << "Grade of Student #" << student + 1 << " in Subject " << grade + 1 << ": ";

int tmp;

std::cin >> tmp;

EXIT_IF(tmp < 0, "Invalid Input: Please enter a nonnegative integer.");

sum += tmp;

}

double avg = std::round(sum / num_grades);

std::cout << "Average of Student " << student + 1 << " is : " << avg << "\n";

total_sum += avg;

}

double class_average = total_sum / num_students;

std::cout << std::fixed << std::setprecision(2) <<

"Class Average Grade is : " << class_average << "\n";

std::cout << "Class Performance is " << get_performance(class_average) << "\n";

}