Results for “SUM”
Small, practical examples. Search by task or narrow things down below.
Calculate a cumulative sum for each position
C: Keep a running total and store each prefix result in a separate output array.
C✓ Tested
Calculate a SHA-256 checksum
Calculate a file checksum so you can compare it with a hash from a trusted source and detect changed contents.
checksum✓ Tested
Calculate a simple packet XOR checksum
Arduino / C: XOR all payload bytes to produce a basic error-detection byte.
Arduino / C✓ Tested
Compute a simple XOR checksum
C: XOR all payload bytes into one byte to demonstrate a basic error-detection field.
C✓ Tested
Consume an asynchronous sequence
JavaScript: for await waits for each value of an async iterator in sequence.
JavaScript✓ Tested
Consume an asynchronous sequence
TypeScript: for await waits for each value of an async iterator in sequence.
TypeScript✓ Tested
Consume positional arguments one at a time
Bash Scripts: Check the argument count before accessing the first parameter with nounset enabled.
Bash Scripts✓ Tested
Inspect a byte without consuming it
Arduino / C: peek leaves the next byte available for a later read.
Arduino / C✓ Tested
Maintain a rolling sum in a circular window
Arduino / C: Subtract the overwritten sample before adding the next one.
Arduino / C✓ Tested
Return zero for a sum over no rows
SQL: SUM produces NULL for an empty input; COALESCE supplies the desired reporting default.
SQL✓ Tested
Return zero for a sum over no rows
SQL Server: SUM produces NULL for an empty input; COALESCE supplies the desired reporting default.
SQL Server✓ Tested
Return zero for a sum over no rows
Postgres: SUM produces NULL for an empty input; COALESCE supplies the desired reporting default.
Postgres✓ Tested