Commonly used String functions in the C language

 

Here is a list of commonly used string functions in the C language, which are part of the standard C library <string.h>:

1. strcpy(): Copies the contents of one string to another.
2. strncpy(): Copies a specified number of characters from one string to another.
3. strcat(): Concatenates (appends) one string to the end of another.
4. strncat(): Concatenates a specified number of characters from one string to another.
5. strcmp(): Compares two strings and returns an integer indicating their relationship.
6. strncmp(): Compares a specified number of characters from two strings and returns an integer indicating their relationship.
7. strlen(): Calculates the length of a string (excluding the null character).
8. strchr(): Searches for the first occurrence of a specified character in a string and returns a pointer to it.
9. strrchr(): Searches for the last occurrence of a specified character in a string and returns a pointer to it.
10. strstr(): Searches for the first occurrence of a specified substring in a string and returns a pointer to it.
11. strtok(): Breaks a string into smaller tokens based on a delimiter.
12. strcpy_s(), strncpy_s(), strcat_s(), strncat_s(): More secure versions of the respective functions, designed to prevent buffer overflows.
13. strdup(): Creates a new string by duplicating an existing string.
14. strpbrk(): Searches a string for any of a set of specified characters and returns a pointer to the first occurrence.
15. strspn(): Calculates the length of the initial segment of a string that consists of only the characters specified in another string.
16. strcspn(): Calculates the length of the initial segment of a string that consists of none of the characters specified in another string.
17. strcoll(): Compares two strings using locale-specific rules.
18. strerror(): Returns a string describing the error code passed as an argument.
19. strtok_r(): Thread-safe version of strtok(), supporting multiple concurrent tokenising operations.

These functions provide a wide range of capabilities for manipulating and working with strings in the C language. Each function serves a specific purpose, allowing you to perform tasks such as copying, concatenation, comparison, searching, tokenising, and more.