C Program to Print Reverse of a String without strrev() function

#include <string.h>
#include <conio.h>
#include <stdio.h>

void main()
{
    int i,j,len=0;
    char str[50],revstr[50];
    //clrscr();
    printf("\n Enter a String to Reverse : " );
    gets(str);
    for(i=0; str[i]!='\0'; i++)
    {
        len++;
    }

    j=0;
    for(i=len-1; i>=0; i--)
    {
        revstr[j++]=str[i];
    }
    printf("\n Reverse of the Given String is: %s",revstr);
    free(str);
    getch();
}

 OUTPUT:

 Enter a String to Reverse : www.programming9.com

 Reverse of the Given String is: moc.9gnimmargorp.www