Program For Reverse a String in C[How to]

                                                          Reversing   String

  Goal:- Reverse a string in c.

Function Used:- 

                            char * strrev(char s[]);

                This function replace string s with it reverse and  returns the address of s.

Explanation:-

               There are three different ways via we can reverse a string:-

              1.Using string function strrev().

             2.Without using string function.

1.Using string function:-

               In this we simply pass the given string to strrev() and return value of it stores in a pointer.Use this pointer to Display reversed string.

2.Without Using string function:-

               We have to methods to reverse a string except string function method:-

               1.By simply copying the each character in  another string in reverse order.

               2.Using pointers.

Program:-

Given Program reverse a string using 3 methods mentioned above.

#include<stdio.h>

#include<string.h>

#include<conio.h>

int main()

       {

           char s[10],r[10];

           char *re,*er=r;

           int j,i;

           printf("Enter a String you want to Reverse:-");

           scanf("%s",s);

           //Using strrev-

           re=strrev(s);// It replaces the string s with its reverse and return its address.

           printf("\nReversed String(Using strrev)-%s",re);

           //Without strrev--

           i=0;

           while(s[i]!='\0'){

           i++;

           }

           j=0;

           while(i>0)
          {

              r[j++]=s[--i];

            }

           r[j]='\0';

  printf("\n\nReversed string(Without using strrev)%s",r);

            //with the help of Pointers

            while(*re)

             {

               re++;

               i++;

             }

             while(i>=0)

              {

                 re--;

                 *er=*re;

                  er++;

                  i--;

             }  

              er='\0';

              printf("\n\n Reversed string (Using Pointers)-%s",r);

              

             getch();

    }    

                

 Output:-

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