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Standard Library String functions in C language
In this article, we will learn about some Standard Library String Functions in C programming language.
Submitted by Sneha Dujaniya, on July 22, 2018
Standard Library String functions
Mostly, every C compiler provides a set of useful library functions for handling strings. Here is a list of more commonly used functions with their uses:
| Function |
Use |
| strlen |
To find length of a string |
| strlwr |
To convert all characters of a string to lowercase |
| strupr |
To convert all characters of a string to uppercase |
| strcpy |
To copy one string into another |
| strncpy |
To copy first n characters of a string into another |
| strdup |
To duplicate a string |
| strrev |
To reverse a string |
| strcat |
To append one string at the end of another string |
| strncat |
To append first n characters of a string at the end of another |
| strcmp |
To compare two strings |
| strncmp |
To compare first n characters of two strings |
| strcmpi |
To compare two strings without regarding the case(“I” denotes the func. Ignores case) |
| stricmp |
Similar to strcmpi |
| strnicmp |
To compare first n characters of two strings without regarding case |
| strchr |
To find first occurrence of a given ‘character’ in a string |
| strrchr |
To find last occurrence of a given ‘character’ in a string |
| strstr |
To find first occurrence of a given ‘string’ in another string |
| strset |
Sets all characters of a string to a given character |
| strnset |
Sets first n characters of a string to a given character |
String Library Functions with Examples