Length of a String

Given a string s, the task is to find the length of the string.

Examples:

Input: s = "abc"
Output: 3

Input: s = "GeeksforGeeks"
Output: 13

Input: s = ""
Output: 0

Using In-built methods

Every programming language offers a built-in method as well to find the length

// C++ program to find length // of a string #include <iostream> #include <cstring> using namespace std; int main() {  string s = "gfg";  cout << s.size() << endl;  return 0; } 

// C program to find the length of // string using strlen function #include <stdio.h> #include <string.h> int main() {  char s[] = "gfg";  printf("%ld", strlen(s));  return 0; } 

/*package whatever //do not write package name here */ import java.io.*; class GfG {  public static void main(String[] args)  {  String s = "gfg";  System.out.println(s.length());  } } 

# Python code to demonstrate string length # using len s = "gfg" print(len(s)) 

using System; class GfG {  static void Main()  {  string s = "gfg";  Console.WriteLine(s.Length);  Console.ReadLine();  } } 

let s = "gfg"; console.log(s.length); 

3 

Writing your Method

The most traditional method of finding the length of the string is by traversing each character through the loop.

• Using a counter, traverse each character of the string with the help of Loop.
• Return the counter value as the length of the string.

#include <bits/stdc++.h> using namespace std; // Method to calculate length of a string int getLength(const string& s) {  int i = 0, cnt = 0;  while (s[i]) {  i++;  cnt++;  }  return cnt; } int main() {  string s = "GeeksforGeeks";  cout << getLength(s) << endl;  return 0; } 

#include <stdio.h> // Function to calculate length of a string int getLength(const char* s) {  int i = 0, cnt = 0;  while (s[i] != '\0') {  i++;  cnt++;  }  return cnt; } // Driver code int main() {  const char* s = "GeeksforGeeks";  printf("%d\n", getLength(s));  return 0; } 

public class GfG {  // Method to calculate length of a string  static int getLength(String s) {  int cnt = 0;  for (char c : s.toCharArray()) {  cnt++;  }  return cnt;  }  public static void main(String[] args) {  String s = "GeeksforGeeks";  System.out.println(getLength(s));  } } 

# Function to calculate length of a string def get_length(s): cnt = 0 for c in s: cnt += 1 return cnt # Driver code s = "GeeksforGeeks" print(get_length(s)) 

using System; class Program {  // Method to calculate length of a string  static int GetLength(string s)  {  int cnt = 0;  foreach (char c in s)  {  cnt++;  }  return cnt;  }  static void Main()  {  string s = "GeeksforGeeks";  Console.WriteLine(GetLength(s));  } } 

// Method to calculate length of a string function getLength(s) {  let i = 0, cnt = 0;  // Use a while loop to iterate through   // the characters until the end of the string  while (s[i] !== undefined) {  i++;  cnt++;  }    return cnt; } // Driver Code let s = "GeeksforGeeks"; console.log(getLength(s)); 

13 

Time Complexity: O(n), where n is the length of the string.
Auxiliary space: O(1)