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Practice Zone Java
10 Topics 15 Questions All Difficulty
Topics
Questions
Check if value fits in byte
Easy
Jan 23, 2026
Convert char digit to int
Easy
Jan 23, 2026
Absolute difference as long
Easy
Jan 23, 2026
Check if string is numeric (no sign)
Easy
Jan 23, 2026
Parse binary string to int
Easy
Jan 23, 2026
Clamp value in range
Medium
Jan 23, 2026
Compare doubles with epsilon
Medium
Jan 23, 2026
Count set bits in int
Medium
Jan 23, 2026
Safe average without overflow
Medium
Jan 23, 2026
Detect overflow on add
Medium
Jan 23, 2026
Convert seconds to hh:mm:ss parts
Hard
Jan 23, 2026
Fast power (pow)
Hard
Jan 23, 2026
Encode two ints into one long
Hard
Jan 23, 2026
Compute checksum mod 1e9+7
Hard
Jan 23, 2026
Split integer into digits array
Hard
Jan 23, 2026