// homework number 4 - Write a program to receive the mark from the user and print the grade for him.

import 'dart:io';

main() { print("Enter your mark : "); int? mark = int.parse(stdin.readLineSync()!);

if (mark >= 95 && mark <= 100) { print("Your grade is : A+ "); } else if (mark >= 89 && mark <= 94) { print("Your grade is : A"); } else if (mark >= 85 && mark < 89) { print("Your grade is : B+"); } else if (mark >= 79 && mark <= 84) { print("Your grade is : B"); } else if (mark >= 75 && mark <= 78) { print("Your grade is : C+"); }else if (mark >= 69 && mark <= 74){ print("Your grade is : C"); }else if (mark >=65 && mark <= 68){ print("Your grade is : D+"); }else if (mark >= 59 && mark <= 64){ print("Your grade is : D"); }else if (mark < 59){ print("Your grade is : F "); }else { print("Your mark is out of limit !"); } }