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Calculate the Length of String without using Strlen() function

Program to check : Length of String without using Strlen() Function

Definition & Explanation

Calculating the length of a string without using the strlen() function involves iterating through the characters of the string until a null character ('\0') is encountered, which marks the end of the string.

Program Logic

Explanation:

  1. Initialize a counter to 0 to store the length of the string.
  2. Iterate through each character of the string.
  3. Increment the counter for each character until a null character is encountered, indicating the end of the string.
  4. Return the final counter value, which represents the length of the string.

Logic:

  1. Initialize a counter variable length to 0.
  2. Iterate through the characters of the string until a null character ('\0') is encountered.
  3. For each character encountered, increment the counter variable length.
  4. Return the value of length as the length of the string.
C

Method 1 :

#include <stdio.h>

int stringLength(const char *str) {
    int length = 0;
    while (str[length] != '\0') {
        length++;
    }
    return length;
}

int main() {
    const char *str = "Hello, World!";
    int length = stringLength(str);
    printf("Length of string: %d\n", length);
    return 0;
}

Output :

C++

Method 1 :

#include <iostream>
using namespace std;

int stringLength(const char *str) {
    int length = 0;
    while (str[length] != '\0') {
        length++;
    }
    return length;
}

int main() {
    const char *str = "Hello, World!";
    int length = stringLength(str);
    cout << "Length of string: " << length << endl;
    return 0;
}

Output :

JAVA

Method 1 :

public class StringLength {
    public static int stringLength(String str) {
        int length = 0;
        while (str.charAt(length) != '\0') {
            length++;
        }
        return length;
    }

    public static void main(String[] args) {
        String str = "Hello, World!";
        int length = stringLength(str);
        System.out.println("Length of string: " + length);
    }
}

Output :

Python

Method 1 :

def string_length(str):
    length = 0
    while str[length:]:
        length += 1
    return length

str = "Hello, World!"
length = string_length(str)
print("Length of string:", length)

Output :

Length of string: 13
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