Reverse string

C programming code

#include <stdio.h>

#include <string.h>

#include<conio.h> 

void main()

{

   char arr[100];

   clrscr();

   printf("Enter a string to reverse\n");

   gets(arr);

   strrev(arr);

   printf("Reverse of entered string is \n%s\n",arr);

   getch();

}

C program to reverse a string using pointers

 Now we will invert string using pointers or without using library function strrev.

#include<stdio.h>

#include<conio.h> 

int string_length(char*);

void reverse(char*);

void main() 

{

   char string[100];

   clrscr(); 

   printf("Enter a string\n");

   gets(string);

   reverse(string);

   printf("Reverse of entered string is \"%s\".\n", string);

   getch();

}

void reverse(char *string) 

{

   int length, c;

   char *begin, *end, temp;

   length = string_length(string);

   begin = string;

   end = string;

    for ( c = 0 ; c < ( length - 1 ) ; c++ )

      end++;

    for ( c = 0 ; c < length/2 ; c++ ) 

   {        

      temp = *end;

      *end = *begin;

      *begin = temp;

      begin++;

      end--;

   }

}

int string_length(char *pointer)

{

   int c = 0;

   while( *(pointer+c) != '\0' )

    c++;

    return c;

}

C program to reverse a string using recursion

#include <stdio.h>

#include <string.h>

#include<conio.h> 

void reverse(char*, int, int);

void main()

{

   char a[100];

   gets(a);

   reverse(a, 0, strlen(a)-1);

   printf("%s\n",a);

   getch();

}

void reverse(char *x, int begin, int end)

{

   char c;

   if (begin >= end)

   return;

   c = *(x+begin);

   *(x+begin) = *(x+end);

   *(x+end) = c;

   reverse(x, ++begin, --end);

}