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Introduction to Dart

bookIncrement and Decrement

Increment (++) and decrement (--) operators are commonly used to increase or decrease a variable's value by 1. They are especially useful in loops for managing counters.

Increment Operators

  • Pre-increment (++variable): increases the value before usage;
  • Post-increment (variable++): increases the value after usage.

Usage in a loop:

main.dart

main.dart

copy

              
12345

            
void main() {
  for (int i = 0; i < 5; ++i) {
    print(i); // Outputs: 0, 1, 2, 3, 4
  }
}

Decrement Operators

  • Pre-decrement (--variable): decreases the value before usage.
  • Post-decrement (variable--): decreases the value after usage.

Usage in a loop:

main.dart

main.dart

copy

              
12345

            
void main() {
  for (int i = 5; i > 0; --i) {
    print(i); // Outputs: 5, 4, 3, 2, 1
  }
}

Task

Complete the code so that it prints all numbers from 2 to 10 inclusive.

main.dart

main.dart

copy

              
12345

            
void main() {
  for (int i = 2; i <= 10; ___) {
    print(i);
  }
}

Use an increment operator.

main.dart

main.dart

copy

              
12345

            
void main() {
  for (int i = 2; i <= 10; i++) {
    print(i);
  }
}
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bookIncrement and Decrement

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Increment (++) and decrement (--) operators are commonly used to increase or decrease a variable's value by 1. They are especially useful in loops for managing counters.

Increment Operators

  • Pre-increment (++variable): increases the value before usage;
  • Post-increment (variable++): increases the value after usage.

Usage in a loop:

main.dart

main.dart

copy

              
12345

            
void main() {
  for (int i = 0; i < 5; ++i) {
    print(i); // Outputs: 0, 1, 2, 3, 4
  }
}

Decrement Operators

  • Pre-decrement (--variable): decreases the value before usage.
  • Post-decrement (variable--): decreases the value after usage.

Usage in a loop:

main.dart

main.dart

copy

              
12345

            
void main() {
  for (int i = 5; i > 0; --i) {
    print(i); // Outputs: 5, 4, 3, 2, 1
  }
}

Task

Complete the code so that it prints all numbers from 2 to 10 inclusive.

main.dart

main.dart

copy

              
12345

            
void main() {
  for (int i = 2; i <= 10; ___) {
    print(i);
  }
}

Use an increment operator.

main.dart

main.dart

copy

              
12345

            
void main() {
  for (int i = 2; i <= 10; i++) {
    print(i);
  }
}
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

Seção 4. Capítulo 5
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