Constants and Variables
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Variables represent values that can change during a program, while constants represent fixed values that cannot change. Variable names must start with a letter or underscore and can include letters, numbers, and underscores, but cannot be a single number. Constants can help simplify code by only requiring updates in one place if values need to change. On a game show, variables could be used for scores that update during gameplay, while constants could be used for fixed values like question point values.
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Constants and Variables
- 2. Variables • Values which can change • The name of a variable can be as short as a single letter but cannot be a single number • The name of a variable can start with a letter or an underscore • After the first character, any letters, numbers or underscores can be used • Some programming languages have reserved words – the variable cannot be one of these
- 3. Constants • Values which cannot change • Can help the source code simpler to understand • If updates are needed and constant values are used, they only need updating once
- 4. Question • Where would you use constants and variables on a game show?