C Program for Digit Operations

Questions and Answers

What is the purpose of the first while loop in the program?

To check if the number is a palindrome.

To reverse the number.

To print the original number.

To find the sum of the digits. (correct)

In the context of this code, what happens if the number entered is 121?

It will acknowledge 121 as not a palindrome.

The reverse will be 121. (correct)

The sum of digits will be 4.

The program will not compile.

What value does the variable 'reverse' hold at the beginning of the program?

The value of `num`

0 (correct)

The sum of digits

What will be printed if the entered number is not a palindrome?

The program will terminate without output. Signup and view all the answers

Which variable stores the number temporarily while calculating the sum of its digits?

temp Signup and view all the answers

What is the sum of the digits of the number 12?

3 Signup and view all the answers

What is the reverse of the number 212?

212 Signup and view all the answers

Which statement is true for the number 12?

The sum of its digits is 3. Signup and view all the answers

How is a number defined as a palindrome?

It is the same when reversed. Signup and view all the answers

What is the sum of the digits of the number 212?

5 Signup and view all the answers

Study Notes

C Program for Digit Operations

Program prompts user for a number input and calculates various properties of the number.
Utilizes standard I/O functions printf and scanf for interaction.

Sum of Digits

Initializes sum to zero and uses a temporary variable temp to hold the number.
A loop iterates while temp is not zero:
- Adds the last digit of temp to sum using temp % 10.
- Reduces temp by removing the last digit using temp /= 10.
Example: Input of 12 results in a sum of digits equal to 3.

Reverse of the Number

Initializes reverse to zero and resets temp to the original number.
A loop constructs the reversed number:
- Multiplies reverse by 10 and adds the last digit of temp.
- Updates temp to remove the last digit.
Example: For input 12, the reversed number is 21.

Palindrome Check

Compares the original number with the reversed number.
If they are equal, prints that the number is a palindrome.
Example: Input 212 is equal to its reverse, confirming it as a palindrome.

Program Output Example

For input 12:
- Outputs sum of digits as 3.
- Outputs reversed number as 21.
- States that 12 is not a palindrome.
For input 212:
- Outputs sum of digits as 5.
- Outputs reversed number as 212.
- Confirms that 212 is a palindrome.

Description

This quiz covers a C program that performs various digit operations such as summing digits, reversing a number, and checking for palindromes. You'll learn how to use standard input/output functions and implement loops for numerical manipulation. Test your understanding of these concepts through practical examples.