How to use strlen in c language

strlen() function is used in C language to calculate the length of a given string, excluding the null terminator: Declare a char array or pointer to store the string. Get the string. Pass a string pointer as an argument to the strlen() function. Store the returned length in a variable.

strlen() usage in C language

strlen() is a function in the C standard library , used to calculate the length of a given null-terminated string.

Syntax

size_t strlen(const char *str);

Parameters

• str: Pointer to null terminated string pointer.

Return value

strlen() returns the length of the string, excluding the null terminator.

Usage

To use the strlen() function, follow these steps:

1. Declare a char array or pointer to store characters string.
2. Use scanf(), gets() or any other method to get the string.
3. Pass a string pointer as a parameter to the strlen() function.
4. Store the returned length in a variable.

Example

#include 
#include 

int main() {
  char str[] = "Hello World";
  size_t length = strlen(str);

  printf("字符串 '%s' 的长度为 %d\n", str, length);

  return 0;
}

Output

字符串 'Hello World' 的长度为 11

Notes

• strlen() does not modify the original string.
• strlen() returns the length in bytes of a string, regardless of multibyte characters.
• For an empty string, strlen() returns 0.

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