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C Library - <string.h>

Last Updated : 23 Jul, 2025

string.h is a standard header file in the C language that contains functions for manipulating strings (arrays of characters). <string.h> header file contains some useful string functions that can be directly used in a program by invoking the #include preprocessor directive.

Syntax:

#include <string.h>

Example:


Output
Str1: Geeksfor
Length of Str1 before concatenation: 8
Str1: GeeksforGeeks

C string.h Library Functions

<string.h> header file contains the following functions: 

Function Name

Function Description

strlen()

Returns the length of the string.

strcpy()

Copy one string to another.

strncpy()

Copy first n characters of one string to another.

strcat()

Concatenates two strings.

strncat()

Concatenates first n characters of one string to another.

strcmp()

Compares two strings.

strncmp()

Compares first n characters of two strings.

strchr()

Find the first occurrence of the given character in the string.

strrchr()

Finds the last occurrence of the given characters in the string.

strstr()

Find the given substring in the string.

strcspn()

Returns the span of the source string not containing any character of the given string.

strspn()

Returns the span of the source string containing only the characters of the given string.

strpbrk()

Finds the first occurrence of any of the characters of the given string in the source string.

strtok()

Split the given string into tokens based on some character as a delimiter.

strcoll()

Compares two strings that are passed.

memset()

Initialize a block of memory with the given character.

memcmp()

Compares two blocks of memory.

memcpy()

Copy two blocks of memory.

memmove()

Moves two blocks of memory.

memchr()

Finds the given character in the block of memory.

Example:


Output
Length of Destination String: 8
tempDestString after strcpy(): Geeks
destString after Concatenation: GeeksforGeeks
Comparing destString with sourceString: 102
Comparing first 5 characters: 0
Searching sourceString in destString: GeeksforGeeks
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