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strlen() Function in C

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Basic Information: strlen() function calculates string length in C
Defined in string.h header file
Returns string length without null character ('\0')
Importance and Applications: Essential for memory management with buffers
Used in loop control conditions
Helps validate user input strings
Working Principle: Iterates through string characters until null character
Requires null termination for accurate length calculation
Doesn't modify original string, only reads characters
Technical Details: Has linear time complexity of O(n)
Requires constant space complexity of O(1)
Returns size_t type value
Limitations: Cannot be used with non-null-terminated strings
Cannot determine length of pointers
Cannot be used directly with arrays
Related Functions: strcmp() compares strings lexicographically
strcpy() copies strings with null terminator
strncat() concatenates strings