Question

Write an interactive program using recursion for each of the following: 
(a) To count the digits of a given number.
(b) To reverse a string
(c) To find the least-common-multiple of two numbers. 

07 Aug 2023
Answer :
Word Count : 1200

Here's an interactive program using recursion for each of the tasks you mentioned:

(a) To count the digits of a given number:

#include <stdio.h>

int countDigits(int number)
{
    if (number == 0)
        return 0;
    else
        return 1 + countDigits(number / 10);
}

int main()
{
    int number;
    printf("Enter a number: ");
    scanf("%d", &number);

    int digitCount = countDigits(number);
    printf("Number of digits: %d\n", digitCount);

    return 0;
}

Explanation: The countDigits function takes an integer number as a parameter and uses recursion to count the number of digits in the number. The base case is when the number becomes 0, in which case the function returns 0. Otherwise, it divides the number by 10 to remove the rightmost digit and recursively calls itself with the updated number. It then adds 1 to the result of the recursive call and returns the sum. In the main function, the user is prompted to enter a number, and the countDigits function is called with that number as the argument. The number of digits is then displayed on the console.

(b) To reverse a string:

#include <stdio.h>

void reverseString(char *str)
{
    if (*str)
    {
        reverseString(str + 1);
        printf("%c", *str);
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