String

C Strings are nothing but array of characters ended with null character (‘\0’).
This null character indicates the end of the string.
Strings are always enclosed by double quotes. Whereas, character is enclosed by single quotes in C.

……

char string[20] = { ‘f’ , ’r’ , ‘e’ , ‘s’ , ‘h’ , ‘2’ , ‘r’ , ‘e’ , ‘f’ , ’r’ , ‘e’ , ‘s’ , ‘h’ , ‘\0’}; (or)
char string[20] = “fresh2refresh”; (or)
char string [] = “fresh2refresh”;

Difference between above declarations are, when we declare char as “string[20]“, 20 bytes of memory space is allocated for holding the string value.
When we declare char as “string[]“, memory space will be allocated as per the requirement during execution of the program.

#include <stdio.h>

int main ()
{
   char string[20] = "fresh2refresh.com";

   printf("The string is : %s \n", string );
   return 0;
}

#include <stdio.h>

int main ()

{

char string[20] = "fresh2refresh.com";

printf("The string is : %s \n", string );

return 0;

}

The string is : fresh2refresh.com

String.h header file supports all the string functions in C language. All the string functions are given below.

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

TUTORIALS POINT