remove void & update comments

math/finding_number_of_Digits_in_a_Number.cpp

@@ -3,12 +3,15 @@
  * @file [Program to count digits in an
  * integer](https://www.geeksforgeeks.org/program-count-digits-integer-3-different-methods)
  *
- * \brief Finding number of Digits in a Number
- * \details It is a very basic math of finding
+ * @brief Finding number of Digits in a Number
+ * @details It is a very basic math of finding
  *  number of digits in a given number i.e, we
  *  can use it by inputting values whether it
- *  can be a positive/negatie value, lets say
+ *  can be a positive/negative value, lets say
  *  integer.
+ *  There is also second method to do it with,
+ *  by using "K = floor(log10(N) + 1)", but its
+ *  only applicable for numbers (not integers).
  *  For more details, refer Algorithms-Explanation
  */
 
@@ -19,10 +22,13 @@
  * @brief Main function
  * @returns 0 on exit
  */
-int main(void) {
+int main() {
     /* Initialize 'n' & 'count' by 0 */
     int n = 0;
     int count = 0;
+    /* 'cout' to ask input from user..
+     * 'cin' to taking integer as input..
+     */
     std::cout << "Enter an integer: ";
     std::cin >> n;
     /* iterate until n becomes 0