1. strlen( ) function:

It calculates the length of the given string and returns the number of characters in a string. The length does not include the NULL character.

Syntax: integer variable = strlen(string);

2. Strcpy( ) function:

It copies the content of one string to another. The strcpy( ) function works almost like a string assignment operator.

Syntax: strcpy(<string1>,<string2>);

When strcpy( ) function is executed, it copies string2 to string1, String2 can be a character array or a character constant.

3. strcat() function:

It adds the characters of one string to the end of another string. It is used to join two strings together.

Syntax: strcat(string1, string2);

The contents of string2 are added attend in string 1, where string 1 is the target string and string 2 is the source string.

4. strrev() function:

It reverses the characters in a string.

Syntax: strrev(string);

eg: strrev(“ABCD”);

Output: DCBA

5. strlwr() function:

converts all characters in a string to lower (small letters) case.

Syntax: strlwr(string);

eg: strlwr(“BHARATH”)

Output: bharath.