C While and Do/While Loop MCQ Questions and Answers

Q. What is the difference between a 'while' loop and a 'do-while' loop in Java?

A. The 'while' loop checks the condition at the beginning, the 'do-while' loop checks it at the end.
B. The 'while' loop requires the condition to be true initially, the 'do-while' loop does not.
C. The 'while' loop executes as long as the condition is true, the 'do-while' loop executes at least once.
D. The 'while' loop is used for iterative tasks, the 'do-while' loop is used for conditional tasks.
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Q. What is the output of the following 'while' loop?

    int i = 1;
    while (i < 5) {
        System.out.print(i + " ");
        i++;
    }
    

A. 1 2 3 4
B. 1 2 3
C. 2 3 4 5
D. 1 1 1
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Q. What is the purpose of the 'break' statement in a 'while' loop?

A. To exit the loop prematurely
B. To skip the next iteration
C. To continue to the next iteration
D. To restart the loop
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Q. What is the output of the following 'do-while' loop?

    int i = 1;
    do {
        System.out.print(i + " ");
        i++;
    } while (i < 5);
    

A. 1 2 3 4
B. 1 2 3
C. 2 3 4 5
D. 1 1 1
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Q. What is the purpose of the 'continue' statement in a 'while' loop?

A. To exit the loop prematurely
B. To skip the rest of the current iteration and move to the next one
C. To restart the loop
D. To execute the loop indefinitely
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Q. How can you create an infinite loop using a 'while' loop?

A. while (true) {
B. while (false) {
C. do { while (true) } while (false);
D. for(;;) {
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Q. What is the output of the following code snippet?

    int count = 0;
    while (count < 5) {
        count++;
        if (count == 3) {
            continue;
        }
        System.out.print(count + " ");
    }
    

A. 1 2 4 5
B. 1 2 3 4 5
C. 1 2 3
D. 2 3 4
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Q. What is the purpose of the 'while' loop in Java?

A. To repeat a block of code as long as a certain condition is true
B. To execute a block of code a fixed number of times
C. To exit a program prematurely
D. To skip a block of code if a certain condition is true
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Q. How can you nest a 'do-while' loop inside a 'while' loop?

A. By placing the 'do-while' loop inside the body of the 'while' loop
B. By using a break statement to exit the inner loop
C. By using a continue statement to skip the inner loop
D. By placing the 'while' loop inside the body of the 'do-while' loop
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Q. What is the output of the following code snippet?

    int num = 1;
    while (num <= 5) {
        System.out.print(num);
        num++;
    }
    

A. 12345
B. 1234
C. 123456
D. 1
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Q. What is the purpose of the 'while' loop in the following code snippet?

    int sum = 0;
    int num = 1;
    while (num <= 5) {
        sum += num;
        num++;
    }
    System.out.println("Sum = " + sum);
    

A. To calculate the sum of the first 5 numbers
B. To print the numbers from 1 to 5
C. To find the largest number in an array
D. To check if a number is even or odd
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Q. What is the output of the following 'do-while' loop?

    int i = 1;
    do {
        System.out.print(i);
        i++;
    } while (i <= 5);
    

A. 12345
B. 1234
C. 123456
D. 1
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Q. How can you use a 'while' loop to read input from the user until a specific value is entered?

A. Use a break statement to exit the loop when the specific value is entered
B. Use a continue statement to skip the current iteration when the specific value is entered
C. Use a flag variable to control the loop until the specific value is entered
D. Use a nested loop to repeatedly read input until the specific value is entered
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Q. What is the output of the following code snippet that uses a 'do-while' loop?

    int num = 1;
    do {
        System.out.print(num);
        num++;
    } while (num < 5);
    

A. 1
B. 1234
C. 12345
D. 2345
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Q. How can you use a 'while' loop to find the sum of all even numbers between 1 and 10?

A. Use a flag variable to keep track of even numbers and add them to the sum
B. Use a nested loop to iterate through the numbers and add the even ones to the sum
C. Use a break statement to exit the loop when an odd number is encountered
D. Use a continue statement to skip odd numbers and add even numbers to the sum
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Q. What is the purpose of the 'else' statement in a 'while' loop?

A. To execute a block of code if the loop condition is true
B. To execute a block of code if the loop condition is false
C. To exit the loop prematurely
D. To skip the next iteration
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Q. What is the output of the following code snippet that uses a 'while' loop and an 'if' statement?

    int i = 1;
    while (i <= 5) {
        if (i % 2 == 0) {
            System.out.print(i + " ");
        }
        i++;
    }
    

A. 2 4
B. 1 2 3 4 5
C. 1 3 5
D. 1 2 3
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Q. How can you use a 'do-while' loop to read input from the user until a specific character is entered?

A. Use a break statement to exit the loop when the specific character is entered
B. Use a continue statement to skip the current iteration when the specific character is entered
C. Use a flag variable to control the loop until the specific character is entered
D. Use a nested loop to repeatedly read input until the specific character is entered
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Q. What is the purpose of the 'flag' variable in the following code snippet that uses a 'while' loop?

    boolean flag = true;
    int num = 1;
    while (flag) {
        System.out.print(num + " ");
        if (num == 5) {
            flag = false;
        }
        num++;
    }
    

A. To control the loop and terminate it when num becomes 5
B. To skip the next iteration when num is equal to 5
C. To exit the loop prematurely when num is greater than 5
D. To restart the loop when num becomes 5
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Q. What is the output of the following code snippet that uses a 'do-while' loop and an 'if-else' statement?

    int i = 1;
    do {
        if (i % 2 == 0) {
            System.out.print("Even ");
        } else {
            System.out.print("Odd ");
        }
        i++;
    } while (i <= 5);
    

A. Odd Odd Even Odd Even
B. Odd Even Odd Even Odd
C. Even Odd Even Odd Even
D. Odd Odd Odd Odd Odd
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Q. How can you use a 'while' loop to find the largest number in an array?

A. Iterate through the array and update the largest number if a larger value is found
B. Use a nested loop to compare each element with every other element in the array
C. Use a break statement to exit the loop when the largest number is found
D. Use a continue statement to skip smaller numbers and store the largest number
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Q. What is the purpose of the 'label' in a labeled 'while' loop?

A. To provide a name for the loop
B. To specify the loop condition
C. To control the flow of the loop
D. To nest one loop inside another
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Q. What is the output of the following code snippet that uses a 'while' loop and a 'switch' statement?

    int i = 1;
    while (i <= 3) {
        switch (i) {
            case 1:
                System.out.print("One ");
                break;
            case 2:
                System.out.print("Two ");
                break;
            case 3:
                System.out.print("Three ");
                break;
        }
        i++;
    }
    

A. One Two Three
B. One
C. One Two
D. One Three
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Q. How can you use a 'do-while' loop to calculate the factorial of a number?

A. Use a break statement to exit the loop when the number becomes 0
B. Use a continue statement to skip the current iteration when the number is even
C. Use a flag variable to control the loop and calculate the factorial
D. Use a nested loop to calculate the factorial recursively
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