If_Else_Example

 import "dart:io";

class Student {
  var sname, sroll, sage;

  void getData(String s, int r, int a) {
    sname = s;
    sroll = r;
    sage = a;

    print("Below are your subjects : \nMaths\nEnglish\nHindi\n");
    print("How many marks you have got in Maths ? : ");
    var mathsMark = stdin.readLineSync();
    if(int.parse(mathsMark!) <= 33) {
      print("Sorry, You are Fail in Maths Subject");
    } else if(int.parse(mathsMark) > 33 && int.parse(mathsMark) < 50) {
      print("Good, Your Maths mark is between 33 to 50");
    } else if(int.parse(mathsMark) > 50 && int.parse(mathsMark) < 70) {
      print("Very Good, Your Maths mark is between 50 to 70");
    } else if(int.parse(mathsMark) > 70) {
      print("Excellent, You have distinctive in Maths Subject, Congratulations!");
      print("How many times have you attempted Maths Exam to get distinction ? : 1 OR 2 OR more...");
      var dist = stdin.readLineSync();
      if(int.parse(dist!) == 1) {
        print("Wow, you are topper student");
      } else if(int.parse(dist) >= 2) {
        print("Ohk, don't mind, Your efforts were successful");
      }
    } else {
      print("You were absent");
    }
    print("How many marks you have got in English ? : ");
    var englishMark = stdin.readLineSync();
    if(int.parse(englishMark!) <= 33) {
      print("Sorry, You are Fail in Maths Subject");
    } else if(int.parse(englishMark) > 33 && int.parse(englishMark) < 50) {
      print("Good, Your Maths mark is between 33 to 50");
    } else if(int.parse(englishMark) > 50 && int.parse(englishMark) < 70) {
      print("Very Good, Your Maths mark is between 50 to 70");
    } else if(int.parse(englishMark) > 70) {
      print("Excellent, You have distinctive in Maths Subject, Congratulations!");
      print("How many times have you attempted Maths Exam to get distinction ? : 1 OR 2 OR more...");
      var dist = stdin.readLineSync();
      if(int.parse(dist!) == 1) {
        print("Wow, you are topper student");
      } else if(int.parse(dist) >= 2) {
        print("Ohk, don't mind, Your efforts were successful");
      }
      print("Your Total Marks is : ${int.parse(mathsMark) + int.parse(englishMark)}");
      print("Your Average Marks is : ${(int.parse(mathsMark) + int.parse(englishMark))/2}");
    } else {
      print("You were absent");
      }
    }
}

void main() {
  Student student = new Student();  //Creating object of class

  print("Please Enter your Name : ");
  var name = stdin.readLineSync();
  print("Please Enter your Roll Number : ");
  var roll = stdin.readLineSync();
  print("Please Enter your Age : ");
  var age = stdin.readLineSync();
  student.getData(name!, int.parse(roll!), int.parse(age!));
}