Program to reverse a string

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

void main()
{
int i,n;
char a[20];
clrscr();
printf("\n Enter a string : ");
gets(a);

n=strlen(a);
printf("\n Reverse string is : ");
for(i=(n-1);i>=0;--i)
printf("%c",a[i]);
getch();
}


                                                  Output