Programming Fundamentals

COBOL stands for Common Business-Oriented Language, so CO stands for 'Common'. The name reflects its design for business data processing applications.

Common module errors in programming include arithmetic errors (calculation mistakes), control logic errors (flawed conditionals or loops), and comparison errors (incorrect relational operations). 'Single error' is not a standard category of programming errors - it's not a recognized type of module error.

When A=30, the condition (A = 32) evaluates to false, so the code inside the IF block is skipped. Control simply passes to the next statement after END IF. No ELSE clause exists, and no error occurs.

When X=22, the condition (X <> 8) is true (22 is not equal to 8), so the THEN clause executes and prints 'Stop program'. Option B is incorrect because the THEN clause does execute. No error occurs or value assignment happens.

When X=7, the expression (X+3)+5 = (7+3)+5 = 15. Since 15 > 10 is true, the THEN clause executes and prints 'Answer is correct.' The program doesn't stop or error; it simply executes the PRINT statement.

When Time=120 and Best=121, the condition (Time < Best) is true (120 < 121), so the first branch executes and prints 'NEW WORLD RECORD!' The ELSEIF and ELSE clauses are never reached.

When Time=130 and Best=120: First condition (130 < 120) is false. ELSEIF checks (130 < 120+10) = (130 < 130), which is also false (not strictly less than). Thus the ELSE clause executes, printing 'AVERAGE RACE'.

When Height=66, the condition (Height > 66) is false because 66 is not greater than 66 (it's equal). The innermost IF block containing the PRINT statement is never executed. No error occurs; the nested IFs simply complete without action.

The nested IFs require ALL conditions to be true: Sex$ = "M" AND Height > 66 AND Weight > 180. Only option A correctly uses AND to combine all three conditions.

SELECT CASE and both single-alternative and double-alternative block IF statements are all control structures that direct program flow. END is a termination keyword used to close blocks, but it doesn't control program flow itself. END simply marks the conclusion of a block structure like IF or SELECT CASE.

Control statements like IF, SELECT CASE, and loops allow programmers to alter the sequential execution of a program. Inquiry-and-response handles user input, Print displays output, and Flowcharting is a design tool. Only control statements actively change the flow of program execution by making decisions or repeating actions based on conditions.

In block IF structures, the block must be properly terminated. The END IF statement marks the conclusion of the IF block. While END alone terminates other structures like SELECT CASE, the specific syntax for block IF requires END IF to properly close the conditional block and maintain code clarity.

Non-executable statements like REM (remark/comment) are ignored during program execution. When a non-executable statement appears after a block IF, the program simply skips it and continues to the next executable statement. The block IF has already been evaluated, and execution proceeds to the first executable instruction following the REM statement. No error occurs, and the IF is not re-executed.

In a double-alternative block IF, the condition is evaluated once. If true, the THEN clause executes and the ELSE clause is skipped. If false, the ELSE clause executes and the THEN clause is skipped. Only one of the two clauses ever executes during a single pass through the IF statement - never both, and never neither.

Programming languages enforce type compatibility when comparing variables. You cannot directly compare a string variable (which stores text) to a numeric variable (which stores numbers) because they represent different kinds of data. This type mismatch will generate an error rather than attempting an invalid comparison.