Design a function to find string length in c

"Design a function to find string length in C" means creating a function that can determine the length of a null-terminated string in the C programming language. The function should take a string as input and return its length as an integer. The function should be able to handle strings of any length and should be designed in a way that is efficient and does not cause any memory errors.

In C, strings are represented as arrays of characters, with the last character being a null terminator ('\0') to indicate the end of the string. The length of a string is the number of characters in the array up to, but not including, the null terminator.

There are two ways to find the length of a string in C:

1. Using the built-in function strlen().
2. Writing a custom function.

Using the strlen() function

The strlen() function is defined in the string.h header file. It takes a string as an argument and returns its length, excluding the null character (\0).

How to use the strlen() function:

#include <string.h>

int main() {
  char str[] = "Hello, world!";

  // Find the length of the string using the strlen() function.
  size_t length = strlen(str);

  // Print the length of the string.
  printf("The length of the string is %lu.\n", length);

  return 0;
}

Output:

The length of the string is 13.

Writing a custom function

To write a custom function to find the length of a string in C, we can use a for loop to iterate over the characters in the string until we encounter the null character (\0). Here is an example of a custom function to find the length of a string:

int my_strlen(char *str) {
  int length = 0;

  while (*str != '\0') {
    length++;
    str++;
  }

  return length;
}

How to use the my_strlen() function:

#include <stdio.h>

int my_strlen(char *str);

int main() {
  char str[] = "Hello, world!";

  // Find the length of the string using the my_strlen() function.
  int length = my_strlen(str);

  // Print the length of the string.
  printf("The length of the string is %d.\n", length);

  return 0;
}

The length of the string is 13.

Which method you use to find the length of a string in C depends on your personal preference. However, it is generally recommended to use the strlen() function, as it is more efficient and easier to use.

Further Reading:

Concatenating Two Strings in C: A Step-by-Step Guide

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