Switch Statement in Dart

The switch statement is used when you want to compare a single variable against multiple possible values. It makes the code cleaner than using multiple else-if conditions.

Syntax:

switch (expression) {
  case value1:
    // code
    break;
  case value2:
    // code
    break;
  default:
    // code if no case matches
}

Example:

import 'dart:io';

void main() {
  print('Enter a day number (1-7):');
  String? input = stdin.readLineSync();
  int day = int.parse(input!);

  switch (day) {
    case 1:
      print('Monday');
      break;
    case 2:
      print('Tuesday');
      break;
    case 3:
      print('Wednesday');
      break;
    case 4:
      print('Thursday');
      break;
    case 5:
      print('Friday');
      break;
    case 6:
      print('Saturday');
      break;
    case 7:
      print('Sunday');
      break;
    default:
      print('Invalid day number');
  }
}

Explanation:

• The user enters a number between 1 and 7.
• Each case prints the corresponding day of the week.
• If the number is outside 1–7, the default block runs.

Sample Input/Output

Input:

day = 5

Output:

Friday

Input:

day = 7

Output:

Sunday

Input:

day = 9

Output:

Invalid day number