What is String library functions in C:

• In C, the string library provides a set of functions that allow you to work with strings.
• These functions are declared in the header file.

Some commonly used string library functions in C:

1. strlen():

• Calculates the length of a string (excluding the null terminator).

#include <string.h>
size_t strlen(const char* str);

2. strcpy():

• Copies a string from one location to another.

#include <string.h>
char* strcpy(char* destination, const char* source);

3. strcat():

• Concatenates (appends) one string to the end of another.

#include <string.h>
char* strcat(char* destination, const char* source);

4. strcmp():

• Compares two strings and returns an integer indicating their relationship (lexicographically).

#include <string.h>
int strcmp(const char* str1, const char* str2);

5. strncmp():

Compares two strings up to a specified number of characters and returns an integer indicating their relationship.

#include <string.h>
int strncmp(const char* str1, const char* str2, size_t n);

6. strchr():

• Searches for the first occurrence of a character in a string and returns a pointer to that location.

#include <string.h>
char* strchr(const char* str, int character);

7. strstr():

• Searches for the first occurrence of a substring in a string and returns a pointer to that location.

#include <string.h>
char* strstr(const char* str1, const char* str2);

8. sprintf():

• Formats and stores a series of characters into a string (similar to printf).

#include <stdio.h>
int sprintf(char* str, const char* format, ...);