ProgramModerate2 marks
Convert the given loop into exit controlled loop. int a, b; for(a = 10, b = 1; a >= 1; a -= 2) { b += a; b++; } System.out.print(b);
Topic: Converting an entry-controlled loop to an exit-controlled loop
Previous-year question practice database
Answer
Exam answer
int a, b; a = 10; b = 1; do { b += a; b++; a -= 2; } while(a >= 1); System.out.print(b);
Explanation
An exit-controlled loop in Java is the do-while, which tests its condition at the bottom and therefore always runs at least once. Convert in three moves:
- Initialisation (a = 10, b = 1) moves out, above the loop.
- The body is copied unchanged, and the update (a -= 2) is added as the LAST statement inside it — forgetting this is the usual mistake and produces an infinite loop.
- The test condition goes into while(...) after the closing brace, and the do-while must end with a semicolon.
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