C Programming: Finding String Length with strlen() Function

Calculating String Length with strlen() Function in C

To design a function to calculate the length of a string using strlen in C, we can follow these steps:

Define the function prototype.

The function will take a pointer to the string as input and return an unsigned integer representing the length of the string.

unsigned int calculate_string_length(const char *string);

Implement the function body.

The function should iterate over the string characters until it encounters the null character ('\0'). The number of characters iterated over will be the length of the string.

unsigned int calculate_string_length(const char *string) {
  unsigned int length = 0;
  while (*string != '\0') {
    length++;
    string++;
  }
  return length;
}

Test the function.

We can write a simple program to test the function as follows:

#include <stdio.h>
#include <string.h>

unsigned int calculate_string_length(const char *string);

int main() {
  char string[] = "This is a test string.";

  unsigned int length = calculate_string_length(string);

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

  return 0;
}

unsigned int calculate_string_length(const char *string) {
  unsigned int length = 0;
  while (*string != '\0') {
    length++;
    string++;
  }
  return length;
}

Output:

The length of the string "This is a test string." is 20.

The calculate_string_length() function can be used to calculate the length of any string in C. It is a simple and efficient function that is easy to use

Further Reading:

Implementation of strncat() in C

add source string at the end of destination string

comparing two string using strcmp and strncmp

Design a function to copy to copy string into destination string using strcpy and strncpy

how to implement implementation of strncpy in c

Design a function to calculate the length of the string using strlen

pre defined string based function

Design a function using my_strcpy and using my_strchr we need to select given char in given string

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