What is the value of statement coverage achieved by test case 1 from test set A? 2 credits [K3]

Question

Options

• A? 75% (21/28)
• B? 78% (22/28)
• C? 85% (24/28)
• D? 90% (25/28)

• A
  82% (32)
• B
  10% (4)
• C
  3% (1)
• D
  5% (2)

Explanation

Option A (75%, 21/28) is correct because test case 1 from test set A executes exactly 21 out of the 28 total executable statements in the code under test, leaving 7 statements unexercised - typically those in branches not triggered by that single test input.

Options B (22/28), C (24/28), and D (25/28) are wrong because they each overcount the statements reached; common mistakes include counting condition expressions, comments, or declaration lines as executable statements, or mistakenly assuming certain unreachable branches get hit.

Memory tip: Statement coverage = executed statements / total statements - count only executable lines (assignments, calls, returns), never blank lines, comments, or { } delimiters. When a single test case is used, ask yourself: "which branches does this one input not reach?" - those unexecuted branches hold the gap between 75% and 100%.

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