C – strcmpi() function

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  • strcmpi( ) function in C is same as strcmp() function. But, strcmpi( ) function is not case sensitive. i.e, “A” and “a” are treated as same characters. Where as, strcmp() function treats “A” and “a” as different characters.
  • strcmpi() function is non standard function which may not available in standard library in C.
  • Both functions compare two given strings and returns zero if they are same.
  • If length of string1 < string2, it returns < 0 value. If length of string1 > string2, it returns > 0 value. Syntax for strcmp( ) function is given below.

int strcmpi ( const char * str1, const char * str2 );

……

Example program for strcmpi( ) function in C:

    • In this program, strings “fresh” and “refresh” are compared. 0 is returned when strings are equal. Negative value is returned when str1 < str2 and positive value is returned when str1 > str2.
#include <stdio.h>
#include <string.h>
int main( )
{
   char str1[ ] = "fresh" ;
   char str2[ ] = "refresh" ;
   int i, j, k ;
   i = strcmpi ( str1, "FRESH" ) ;
   j = strcmpi ( str1, str2 ) ;
   k = strcmpi ( str1, "f" ) ;
   printf ( "n%d %d %d", i, j, k ) ;
   return 0;
}

Output:

0 -1 1

Other C String functions:

    • String.h header file supports all the string functions in C language. All the string functions are given below.
    • Click on each string function name below to display example programs.
S.no
String functions
Description
1 strcat ( )  Concatenates str2 at the end of str1.
2 strncat ( )  appends a portion of string to another
3 strcpy ( )  Copies str2 into str1
4 strncpy ( )  copies given number of characters of one string to another
5 strlen ( )  gives the length of str1.
6 strcmp ( )  Returns 0 if str1 is same as str2. Returns <0 if strl < str2. Returns >0 if str1 > str2.
7 strcmpi.(.)  Same as strcmp() function. But, this function negotiates case.  “A” and “a” are treated as same.
8 strchr ( )  Returns pointer to first occurrence of char in str1.
9 strrchr ( )  last occurrence of given character in a string is found
10 strstr ( )  Returns pointer to first occurrence of str2 in str1.
11 strrstr ( )  Returns pointer to last occurrence of str2 in str1.
12 strdup ( )  duplicates the string
13 strlwr ( )  converts string to lowercase
14 strupr ( )  converts string to uppercase
15 strrev ( )  reverses the given string
16 strset ( )  sets all character in a string to given character
17 strnset ( )  It sets the portion of characters in a string to given character
18 strtok ( )  tokenizing given string using delimiter

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