Ruby - Operators and Expressions
Which Ruby expression correctly checks if variable
num is between 15 and 25 inclusive?Which Ruby expression correctly checks if variable num is between 15 and 25 inclusive?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the requirement
Check if num is greater than or equal to 15 and less than or equal to 25.Step 2: Analyze each option
num >= 15 && num <= 25 uses '>= 15' and '<= 25' combined with '&&' which is correct.Step 3: Eliminate incorrect options
num > 15 || num < 25 uses '||' which allows values outside the range. num > 15 && num < 25 excludes boundaries. num == 15 && num == 25 checks if num equals both 15 and 25 simultaneously, which is impossible.Final Answer:
num >= 15 && num <= 25 -> Option BQuick Check:
Use '&&' with inclusive operators for range check [OK]
Quick Trick: Use '&&' with >= and <= for inclusive range [OK]
Common Mistakes:
- Using '||' instead of '&&' for range checks
- Using strict inequalities excluding boundaries
- Checking equality to two different values simultaneously
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