Programming Fundamentals Quiz: Variables and Loops

Question 1A counter starts at 4 and gains 3 on each of five iterations. Find its final value as a whole number with no unit.

Enter a number.

Answers within 0.5 of the expected value are accepted.

Question 2An accumulator starts at 2 and adds each integer from 3 through 6 inclusive. Find the final value as a whole number with no unit.

Enter a number.

Answers within 0.5 of the expected value are accepted.

Question 3A variable starts at 5. A loop doubles it on each of four iterations. Find the final value as a whole number with no unit.

Enter a number.

Answers within 0.5 of the expected value are accepted.

Question 4A program executes score = score + bonus as an assignment. What happens?

The statement compares two values and stores no changeThe statement solves for an unknown algebraic scoreThe statement changes bonus to match the stored scoreThe statement stores the sum as score’s new value

Question 5A sum is reset inside the body just before adding each new reading. What explains a final result that retains only the latest reading?

The addition combines earlier readings after the loop finishesThe loop overwrites each reading with the current running sumThe reset discards contributions from preceding passesThe reset makes the loop stop after its first addition

Question 6A loop visits a zero-based list and permits an index equal to its length. What boundary problem follows?

It skips the first position before examining any itemsIt revisits the previous position without increasing the indexIt changes the collection’s length to include another elementIt attempts access beyond the collection’s stored elements

Question 7A condition needs checking once to decide whether to apply a discount. Which construct expresses that job?

A conditional choosing an action from the result of the testA while loop repeating the discount until the total stops changingAn assignment overwriting the condition with trueA comparison whose result is discarded before choosing an action

Question 8In a while loop intended to finish at zero, a positive stock count stays unchanged. Which change addresses the cause?

Decreasing the count on the actual path through the loopChecking the unchanged count before entering the loopRaising the starting count before testing the conditionRenaming the count while leaving its updates unchanged

Question 9Two functions each declare a local variable named total. What does local scope provide?

A shared result that synchronizes whenever either function runsA rule making the first declaration global for later callsA separate binding for identically spelled names in each functionA guarantee that both functions return equal numeric values

Question 10A program produces a plausible total on a large input, but its update rule is uncertain. What test gives direct evidence?

A larger input whose correct result has not been calculatedA small input with known results and traced intermediate stateA renamed output variable with the update rule left unexaminedA repeated run of the same input with the trace suppressed

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Programming Fundamentals Quiz: Variables and Loops

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