What is strrev() Function in C language?

An array of characters is called a string.

Declaration

The syntax for declaring an array is as follows −

char stringname [size];

For example − char string[50]; string of length 50 characters

Initialization

• Using single character constant −

char string[10] = { ‘H’, ‘e’, ‘l’, ‘l’, ‘o’ ,‘\0’}

• Using string constants −

char string[10] = "Hello":;

Accessing − There is a control string "%s" used for accessing the string till it encounters ‘\0’.

The strrev( ) Function

• This function is used for reversing a string.
• The reversed string is stored in the same string.

Syntax

The syntax for strrev() function is as follows −

strrev (string)

Example

The following program shows the usage of strrev() function.

#include<stdio.h> main ( ){    char a[50] ;    clrscr( );    printf ("enter a string");    gets (a);    strrev (a);    printf("reversed string = %s",a)    getch ( ); }

Output

When the above program is executed, it produces the following result −

enter a string Hello Reverse string = olleH

Example 2

Let’s see another example to know more about string reverse.

The C program to reverse a string using strrev library function is given below −

#include<stdio.h> #include<string.h> void main(){    char string[25];    printf("Enter String to be reversed : ");    gets(string);    printf("String before strrev(): %s
",string);    strrev(string);    printf("The string after strrev(): ");    puts(string); }

Output

When the above program is executed, it produces the following result −

Enter String to be reversed : Tutorials Point String before strrev(): Tutorials Point The string after strrev(): tnioP slairotuT