Question

Explain the concept of expression.

Hint:

Expressions are evaluated in an order based on operator precedence. Be mindful of parentheses to control evaluation order.

Answer 1

Step 1: Understanding Expressions.
In programming, an expression is any valid combination of variables, constants, operators, and functions that evaluates to a value. Expressions are the building blocks of logic and calculations in code. They can be simple, such as arithmetic operations, or complex, involving multiple operations.
Step 2: Examples of Expressions.
- Arithmetic Expression: `a + b * c` (evaluates to a value based on arithmetic operations).
- Relational Expression: `a>b` (evaluates to a boolean value).
- Logical Expression: `x && y` (evaluates to a boolean value based on logical conditions).
Step 3: Conclusion.
Expressions are evaluated and result in values, which are crucial for decision-making and calculations in programs.