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C programming/C reference/nonstandard/strcasecmp
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In programming language C, strcasecmp is a function declared in the strings.h header file (or sometimes in string.h) that compares two strings irrespective of the case of characters.
This function is in POSIX.1-2001.
Prototype
int strcasecmp(const char *f1, const char *f2);
This function returns an integer i :
i > 0, if lowercase(f1) is greater than lowercase(f2)
i < 0, if lowercase(f1) is found less than string lowercase(f2) and
i = 0, if lowercase(f1) is equal to lowercase(f2).
Example
# include <stdio.h>
# include <strings.h>
int main(int argc, char *argv[]){
int i;
if(argc != 3){
printf("bad input\n");
return 1;
}
i = strcasecmp(argv[1], argv[2]);
if (i == 0)
printf("'%s' equals '%s'\n", argv[1], argv[2]);
else if (i > 0)
printf("'%s' is greater than '%s'\n", argv[1], argv[2]);
else if (i < 0)
printf("'%s' is less than '%s'\n", argv[1], argv[2]);
return 0;
}