strcoll

 

C

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Strings library

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Null-terminated byte strings

Functions
Character manipulation
isalnum isalpha islower isupper isdigit isxdigit isblank (C99)	iscntrl isgraph isspace isprint ispunct tolower toupper
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atof atoiatolatoll strtolstrtoll	strtoulstrtoull strtofstrtodstrtold
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Defined in header <string.h>
int strcoll( const char *lhs, const char *rhs );

Compares two null-terminated byte strings according to the current locale as defined by the LC_COLLATE category.

Parameters

lhs, rhs

-

pointers to the null-terminated byte strings to compare

Return value

Negative value if lhs is less than rhs.

​0​ if lhs is equal to rhs.

Positive value if lhs is greater than rhs.

Example

Run this code

#include <stdio.h>
#include <string.h>
#include <locale.h>
 
int main(void)
{
    setlocale(LC_COLLATE, "cs_CZ.iso88592");
 
    const char* s1 = "hrnec";
    const char* s2 = "chrt";
 
    printf("In the Czech locale: ");
    if(strcoll(s1, s2) < 0)
         printf("%s before %s\n", s1, s2);
    else
         printf("%s before %s\n", s2, s1);
 
    printf("In lexicographical comparison: ");
    if(strcmp(s1, s2) < 0)
         printf("%s before %s\n", s1, s2);
    else
         printf("%s before %s\n", s2, s1);
}

Output:

In the Czech locale: hrnec before chrt
In lexicographical comparison: chrt before hrnec

See also

strcmp	compares two strings (function)
strncmp	compares a certain amount of characters of two strings (function)
memcmp	compares two buffers (function)
C++ documentation for strcoll