Which statement about 'const' declarations is true?

Which statement about 'const' declarations is true?

• A. 'const' variables can be re-assigned
• B. 'const' variables must be initialized at declaration
• C. 'const' variables are limited to block scope
• D. 'const' variables cannot be used in loops

Answer: (B)

The statement that 'const' variables must be initialized at declaration is true because, in programming languages that support the 'const' keyword, such as JavaScript and C++, a 'const' variable signifies that its value is constant and cannot be changed once it has been assigned. Therefore, the initialization must occur at the point of declaration to ensure that the variable holds a defined value. This design helps prevent errors that might arise from uninitialized variables and enforces the notion of immutability from the moment the 'const' variable is created. While it's common for 'const' declarations to have block scope, it is not universally true across all programming contexts, and 'const' variables can indeed be utilized within loops, depending on the specific programming language's rules and scope handling.

The statement that 'const' variables must be initialized at declaration is true because, in programming languages that support the 'const' keyword, such as JavaScript and C++, a 'const' variable signifies that its value is constant and cannot be changed once it has been assigned. Therefore, the initialization must occur at the point of declaration to ensure that the variable holds a defined value. This design helps prevent errors that might arise from uninitialized variables and enforces the notion of immutability from the moment the 'const' variable is created.

While it's common for 'const' declarations to have block scope, it is not universally true across all programming contexts, and 'const' variables can indeed be utilized within loops, depending on the specific programming language's rules and scope handling.