Program to find length of string and show it in upper, lower and reverse order

Write a program to find length of string and show it in upper, lower and reverse order 

#include <stdio.h>

#include <conio.h>

void main ()

{

            char str [20];

            clrscr ();

            printf ("Enter your name: ");

            gets (str);

            printf("\nLength is : %d",strlen(str));

            printf("\nUpper is : %s",strupr(str));

            printf("\nLower is : %s",strlwr(str));

            printf("\nReverese is : %s",strrev(str));

            getch ();

}