Computer Programming MCQ With Answers Quiz
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Here is an interesting quiz on computer programming MCQs with answers. Different software enables a computer to achieve specific tasks and using different programming languages, one is able to come up with the desired software. Using the quiz questions below will give you a chance to review some basic information you have on programming as a whole and different types of data one can use. Try it out and get to refresh your memory. All the best!
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- 1.
Of the following, if statements, which one correctly executes three instructions if the condition is true?
- A.
If (x < 0) a = b * 2; y = x; z = a – y;
- B.
{ if (x < 0) a = b * 2; y = x; z = a – y; }
- C.
If{ (x < 0) a = b * 2; y = x; z = a – y ; }
- D.
If (x < 0) { a = b * 2; y = x; z = a – y; }
Correct Answer
D. If (x < 0) { a = b * 2; y = x; z = a – y; }Explanation
The correct answer is the last statement: if (x < 0) { a = b * 2; y = x; z = a – y; }. This is because it correctly uses the if statement syntax, with the condition in parentheses followed by the code block enclosed in curly braces. The other options either have incorrect syntax or do not include the necessary curly braces to enclose all three instructions.Rate this question:
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- 2.
Jim currently runs a car rental dealership and wishes to write a program that allows the user to enter the temperature of the location they plan to visit and then recommend a car based on the data. Below is a summary of the program structure Jim is looking for. Temp greater than 80 a Convertible should be selected. Temp greater than 60 and less than 80 an SUV should be selected Temp less than 60 a truck should be selected. Jim has no trouble writing the code if the temperate is greater than 80 but gets stuck when he arrives at the second line of code which reads Temp greater than 60 and less than 80 an SUV should be selected. What type of operator is Jim needing to use within his code?
- A.
&&
- B.
| |
- C.
!=
- D.
==
Correct Answer
A. &&Explanation
Jim needs to use the && (logical AND) operator within his code. The && operator allows him to combine multiple conditions and check if they are all true before executing a certain block of code. In this case, Jim wants to select an SUV if the temperature is greater than 60 and less than 80, so he needs to use the && operator to check both conditions simultaneously.Rate this question:
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- 3.
_______ is the process of finding errors and fixing them within a program.
- A.
Compiling
- B.
Executing
- C.
Debugging
- D.
Scanning
Correct Answer
C. DebuggingExplanation
Debugging is the process of finding errors and fixing them within a program. It involves identifying and resolving issues such as logical errors, syntax errors, or runtime errors that prevent the program from working correctly. This process often requires the use of debugging tools and techniques, such as setting breakpoints, stepping through code, and analyzing variables, in order to locate and rectify the errors.Rate this question:
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- 4.
Compare the following two if statements and select, which answer best, summarizes each line of code. string name1, name2; int guess, answer; if (name1.equals(name2)) if (guess == answer)
- A.
The first if statement will compare the numerical value of the two names entered to see if they are equal and the second if statement will also compare the numerical values to see if they are equal
- B.
The first if statement will not work correctly due to string values being used, the second if statement will correctly compare the variables guess and answer
- C.
The first if statement will compare the two string values to see if they are equal and the second will compare the two integer values to see if they are equal.
- D.
The first if statement should read if (name1 == name2) in order to properly compare the values and the second if statement will compare the numerical values to see if they are equal.
Correct Answer
C. The first if statement will compare the two string values to see if they are equal and the second will compare the two integer values to see if they are equal.Explanation
The explanation summarizes that the first if statement compares the two string values to see if they are equal, while the second if statement compares the two integer values to see if they are equal.Rate this question:
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- 5.
Sal needs to execute a section of code ten times within a program. Compare the selection structures below and select which one meets the needs identified.
- A.
If-Else
- B.
For
- C.
While
- D.
If
Correct Answer
B. ForExplanation
The correct answer is "For" because the "For" loop is specifically designed to execute a section of code a certain number of times. In this case, Sal needs to execute the code ten times, and the "For" loop allows for easily specifying the number of iterations. The other selection structures, such as "If-Else", "While", and "If", do not have a built-in mechanism for repeating a section of code multiple times.Rate this question:
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- 6.
Kim has just constructed her first for loop within the Java language. Which of the following is not a required part of a for loop?
- A.
Initialization
- B.
Condition
- C.
Variable
- D.
) increment
Correct Answer
C. VariableExplanation
A variable is not a required part of a for loop. The initialization, condition, and increment are the essential components of a for loop. The initialization sets the initial value of the loop control variable, the condition determines when the loop will continue executing, and the increment specifies how the loop control variable will be updated after each iteration. However, a variable is not necessary for a for loop to function properly.Rate this question:
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- 7.
Which command will stop an infinite loop?
- A.
Alt - C
- B.
Shift - C
- C.
Esc
- D.
Ctrl - C
Correct Answer
D. Ctrl - CExplanation
Ctrl - C is the correct answer because it is a commonly used keyboard shortcut to interrupt or terminate a process in many operating systems and programming languages. When an infinite loop is running, pressing Ctrl - C sends a signal to the system to stop the execution of the loop and exit the program. This allows the user to regain control and prevent the program from running indefinitely.Rate this question:
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- 8.
During program development, software requirements specify
- A.
How the program will accomplish the task
- B.
What the task is that the program must perform
- C.
How to divide the task into subtasks
- D.
How to test the program when it is done
Correct Answer
B. What the task is that the program must performExplanation
Software requirements specify what the task is that the program must perform. This means that the requirements outline the specific functionalities and objectives that the program needs to achieve. They define the desired behavior and outcomes of the program, serving as a guide for the development process. By clearly stating what the program must accomplish, the requirements help ensure that the final product meets the needs and expectations of the stakeholders.Rate this question:
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- 9.
Which of the sets of statements below will add 1 to x if x is positive and subtract 1 from x if x is negative but leave x alone if x is 0?
- A.
If (x > 0) x++; else x--;
- B.
If (x > 0) x++; else if (x < 0) x--;
- C.
If (x == 0) x = 0; else x++; x--;
- D.
X++; x--;
Correct Answer
B. If (x > 0) x++; else if (x < 0) x--;Explanation
The set of statements that will add 1 to x if x is positive, subtract 1 from x if x is negative, but leave x alone if x is 0 is: if (x > 0) x++; else if (x < 0) x--;
If x is positive (greater than 0), it will be incremented by 1.
If x is negative (less than 0), it will be decremented by 1.
If x is 0, none of the conditions will be met, so x will remain unchanged.
The other sets of statements do not properly handle the case where x is 0 or might not correctly subtract 1 from x when it is negative.Rate this question:
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- 10.
Kevin has implemented a While loop within his Java program. Assess the code statement below and select which answer best summarizes the output Kevin will experience once the while statement is executed. int count = 1; while (count <=25) { System.out.println (count); Count = count –1; } System.out.println (“Done”);
- A.
The while loop will execute 25 times and print the numbers 1 thru 25 and finish with the printing of Done.
- B.
The while loop will execute 25 times and print the numbers 25 down to 1 and finish with the printing of Done.
- C.
The while statement will not function correctly due to a missing semicolon(;) after the statement while (count <=25)
- D.
The while statement will execute by counting down from 1 until infinity and result in an infinite loop.
Correct Answer
D. The while statement will execute by counting down from 1 until infinity and result in an infinite loop.Explanation
The code initializes the variable "count" to 1 and enters a while loop that will continue as long as "count" is less than or equal to 25. Inside the loop, it prints the value of "count" and then decrements "count" by 1. However, there is a typo in the code where "Count" is used instead of "count" for decrementing. As a result, "count" will always remain 1, causing an infinite loop. The program will not print any numbers or the "Done" message.Rate this question:
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- 11.
A loop that never ends is referred to as a(n)_________.
- A.
While loop
- B.
Infinite loop
- C.
Recursive loop
- D.
) for loop
Correct Answer
B. Infinite loopExplanation
An infinite loop refers to a loop that continues indefinitely without ever terminating. This can occur when the loop condition is always true or when there is no exit condition specified within the loop. As a result, the loop keeps repeating its code block endlessly until it is manually interrupted or the program is terminated.Rate this question:
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- 12.
Jay is considering adding a repetition statement within his Java programming final project. Jay is unsure of the number of times each loop needs to execute. Analyze the conditional statements below and select which statement best fits the need identified by Jay within his programming.
- A.
While loop
- B.
If-Else
- C.
For loop
- D.
Switch statement
Correct Answer
A. While loopExplanation
Jay is considering adding a repetition statement within his Java programming final project. He is unsure of the number of times each loop needs to execute. The while loop is the best fit for this need because it allows him to repeatedly execute a block of code as long as a certain condition is true. This means that Jay can use the while loop to execute the loop until he is satisfied with the number of times it has been executed, without needing to know the exact number beforehand.Rate this question:
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- 13.
Score =Keyboard.readInt(); while (score != -1) { System.out.println (“The score is” + score); score =Keyboard.readInt(); } USER INPUT = -1, predict what will happen after the user input is accepted into the java program.
- A.
The while statement will continue to ask the user to enter a score and then print out the score that has been received.
- B.
The while loop will execute an infinite number of times because the program statement can never be false
- C.
The while statement will never print the statement “The score is” because the condition present within the while will be false on the first time through.
- D.
The while statement will function until a value other than –1 is entered.
Correct Answer
C. The while statement will never print the statement “The score is” because the condition present within the while will be false on the first time through.Explanation
After the user input of -1 is accepted into the Java program, the while statement will not execute the code block inside it. This is because the condition of the while statement is "score != -1", and since the user input is -1, the condition is false and the code block is not executed. Therefore, the statement "The score is" will not be printed.Rate this question:
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- 14.
Analyze the following error that was received when Scott tried to compile his Java program named average. Average.java:14: 'else' without 'if' else ^ Which of the following could have resulted in the error being generated?
- A.
Scott used an infinite loop within his program
- B.
Scott placed a semicolon at the end of an If statement
- C.
Scott used an incorrect looping structure
- D.
Scott omitted a line of code below the If statement such as a System.out.pritnln or a Keybaord.readInt();
Correct Answer
D. Scott omitted a line of code below the If statement such as a System.out.pritnln or a Keybaord.readInt();Explanation
Among the options provided, the error "Average.java:14: 'else' without 'if'" is most likely to be generated if: Scott omitted a line of code below the If statement, such as a System.out.println or a Keyboard.readInt();. If Scott had a standalone else statement without an if statement preceding it, this error would occur. An else statement must always be paired with an if statement. If there is no if statement associated with the else statement, the compiler will generate the error mentioned in the question.Rate this question:
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