[ENG SUB] [Null Safety] Pemrograman Dasar Dart 04. Mathematical Operators

Summary

In this video, the instructor explains operators and expressions in Dart programming. The focus is on common operators, including assignment, mathematical, relational, and logical operators. The video highlights binary and unary mathematical operators, demonstrating their use with examples like addition, subtraction, multiplication, division, and modulo. The distinction between postfix and prefix increment/decrement operators is also explored. The tutorial further shows how to simplify expressions and perform operations like adding, subtracting, multiplying, and dividing variables. Viewers are encouraged to watch a previous video for a deeper understanding of assignment operators.

Takeaways

• 😀 Operators in Dart are symbols that instruct the computer to perform operations on operands (values).
• 😀 There are four main categories of operators in Dart: assignment, mathematical, relational, and logical operators.
• 😀 The assignment operator (`=`) is used to assign a value to a variable, as explained in the 'variables & data types' video.
• 😀 Mathematical operators can be binary (requiring two operands) or unary (requiring one operand).
• 😀 Common binary mathematical operators include addition (`+`), subtraction (`-`), multiplication (`*`), division (`/` and `~/`), and modulo (`%`).
• 😀 The division operator (`/`) produces a result of type double (with decimals), while the integer division operator (`~/`) gives an integer result without decimals.
• 😀 The modulo operator (`%`) returns the remainder of a division operation.
• 😀 Unary operators such as increment (`++`) and decrement (`--`) modify the operand by adding or subtracting 1, respectively.
• 😀 Increment and decrement operators can be used as postfix (after the operand) or prefix (before the operand), affecting the order of operations.
• 😀 Shorthand operators like `+=`, `-=`, `*=`, and `/=`, allow for more concise code by combining the operation and assignment in one line.
• 😀 The difference between prefix and postfix operators is that the postfix operator applies the operation after using the operand's value, while the prefix operator applies it before.

Q & A

What are operators in Dart programming language?

Operators are symbols that instruct the computer to perform operations or actions on one or more operands. An operand is the object that the operator acts upon.

What are the four categories of operators in Dart?

The four categories of operators in Dart are assignment operators, mathematical operators, relational operators, and logical operators.

What is the purpose of the assignment operator in Dart?

The assignment operator is used to assign a value to a variable, instructing the variable to point to a particular value.

How do binary operators differ from unary operators in Dart?

Binary operators require two operands, such as addition or subtraction. Unary operators, on the other hand, require only one operand, such as increment (++) or decrement (--).

What is an example of a binary operator in Dart, and how does it work?

An example of a binary operator is the addition operator (+). It adds two operands, such as '5 + 2', which results in 7.

What is the difference between the '/' and '~/'' operators in Dart?

The '/' operator performs division and returns a double (decimal value), while the '~/'' operator performs integer division, returning an integer result without decimals.

What does the '%' operator do in Dart?

The '%' operator is used to calculate the remainder of a division operation. For example, '7 % 3' returns 1, which is the remainder of the division.

How does the prefix and postfix usage of increment (++) and decrement (--) operators differ?

In postfix, the operation is performed after the operand is used in another expression. In prefix, the operation is performed before the operand is used in the expression.

Can you give an example of using the increment operator in a prefix and postfix form?

In postfix, 'number++' increments the value of 'number' after it is used in the operation. In prefix, '++number' increments the value of 'number' before it is used in the operation.

What is shorthand syntax for mathematical operations in Dart?

Dart allows shorthand operators like '+=', '-=' to simplify mathematical operations. For example, 'number += 10' is equivalent to 'number = number + 10'.