String Comparison function in C Examples

strcmpi() Function

strcmpi() function in C is same as strcmp() function. But, strcmpi() function is not case sensitive. i.e, "P" and "p" are treated as same characters. Where as, strcmp() function treats "S" and "s" as different characters. .

strcmpi() is a library function of string.h header file, if strings are same (in any case Upper/Lower) it will return 0 otherwise it will return the difference of first dissimilar characters (i.e. non zero value).

For Example: - we have two strings "Hello World!" and "HELLO WORLD!", strcmp() function will return 0 becuase strings are same.

C strcmpi() syntax

 int strcmpi ( const char * strng1, const char * strng2 );

Example 1:


  Enter string1: Hello World!
  Enter string2: HELLO WORLD!
  Both strings are same.

Example 2:


 0 -1 1

List of String function in C

Functions Description
strcat( ) The strcat() function is used to concatenate one string(source) at the end of another string(destination).
strncat( ) Appends first n characters of a string at the end of another.
strcpy( ) Copies from str2 into str1
strncpy( ) Copies given number of characters of one string to another
strlen( ) Gives the length of str1
strcmp( ) Returns 0 if str1 is same as str2. Returns <0 if strl < str2. Returns >0 if str1 > str2
strcmpi( ) Same as strcmp() function. But, this function negotiates case. “A” and “a” are treated as same.
strchr( ) Returns pointer to first occurrence of char in str1
strrchr( ) last occurrence of given character in a string is found.
strstr( ) Returns pointer to first occurrence of str2 in str1
strrstr( ) Returns pointer to last occurrence of str2 in str1
strdup( ) Duplicates the string
strlwr( ) Converts string to lowercase
strupr( ) Converts string to uppercase
strrev( ) Reverses the given string
strset( ) Sets all character in a string to given character
strnset( ) It sets the portion of characters in a string to given character
strtok( ) Tokenizing given string using delimiter