Strings are considered a group of characters. In the C language, a string is denoted with the help of a character array.

Basically, the end of the string is denoted by specifying a  **null** `\0` character inside the memory.

# Syntax

A string can be declared by:
```c 
char a[10].
```
In the example above, variable `a` is a character array where you can store up to `10` characters.

# Initialization 

A string can be initialized by:
```c
char a[5] = {'H', 'e', 'l', 'l' '\0'};
```


#include <stdio.h>

int main () {

   char a[5] = {'H', 'e', 'l', 'l', '\0'};
   printf("String: %s\n", a );
   return 0;
}

# String functions

Consider the two strings `s1` and `s2`. Here are few built-in string functions that are available in the `string.h` header file:

* `strlen(s1)`: returns the length of a string.

* `strcpy(s1, s2)`: copies string s2 to s1

* `strrev(s1)`: reverses the given string

* `strcmp(s1, s2)`: returns `0` if `s1` and `s2` contain the same string. Similarly, it returns less than `0` if `s1 < s2` and it returns greater than `0` if `s1 > s2`

* `strcat(s1, s2)`: concatenates two strings


What are strings in C?

In C, strings are character arrays ending with a null character. Various functions include strlen, strcpy, strrev, strcmp, and strcat.