46.Reverse string

1.Using function

#include <stdio.h>

#include <string.h>

int main()

{

   char arr[100];

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

   gets(arr);

   strrev(arr);

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

   return 0;

}

2.Without using function

#include<stdio.h>

int string_length(char*);

void reverse(char*);

main()

{

   char string[100];

   printf("Enter a string\n");

   gets(string);

   reverse(string);

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

   return 0;

}

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;

}