TCS Coding Practice Question | Reverse a Number

Given a number, the task is to reverse this number using Command Line Arguments. Examples:

Input: num = 12345
Output: 54321
Input: num = 786
Output: 687

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Approach:

• Since the number is entered as Command line Argument, there is no need for a dedicated input line
• Extract the input number from the command line argument
• This extracted number will be in String type.
• Convert this number into integer type and store it in a variable, say num
• Initialize a variable, say rev_num, to store the reverse of this number with 0
• Now loop through the number num till it becomes 0, i.e. (num > 0)
• In each iteration,
  • Multiply rev_num by 10 and add remainder of num to it. This will store the last digit of num in rev_num
  • Divide num by 10 to remove the last digit from it.
• After the loop has ended, rev_num has the reverse of num.

Program:

Output:

• In C:

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• In Java :

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• In Python

👁 Screenshot-2023-07-23-152257

• In C++:   

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