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; }

Output

IF WE RUN THE ABOVE CODE IT WILL GENERATE FOLLOWING OUTPUT

length of string is : 15