C++ program for length of a string using recursion

Given with the string and the task is to calculate the length of the given string using a user defined function or in-built function.

Length of a string can be calculated using two different ways −

Using user defined function − In this, traverse the entire string until ‘\o’ is found and keep incrementing the value by 1 through recursive call to a function.
Using user in-build function − There is an in-build function strlen() defined within “string.h” header file which is used for calculating the length of a string. This function takes single argument of type string and return integer value as length.

Example

Input-: str[] = "tutorials point"
Output-: length of string is 15
Explanation-: in the string “tutorials point” there are total 14 characters and 1 space making it a total of length 15.

Algorithm

Start
Step 1-> declare function to find length using recursion
   int length(char* str)
      IF (*str == '\0')
         return 0
      End
      Else
      return 1 + length(str + 1)
   End
Step 2-> In main()
   Declare char str[] = "tutorials point"
   Call length(str)
Stop

Example

Live Demo

#include <bits/stdc++.h>
using namespace std;
//recursive function for length
int length(char* str) {
   if (*str == '\0')
      return 0;
   else
      return 1 + length(str + 1);
}
int main() {
   char str[] = "tutorials point";
   cout<<"length of string is : "<<length(str);
   return 0;
}