how to write a string when string is print through by the keyboard .( method 2)

#include<stdio.h>

#include<conio.h>

int main()

{   

    char a[20];

    int i=0;

   printf("enter your string ");

   scanf("%s",a);

   while(a[i] != '\0')

 { 

   i++;

 }  

   printf("%s",a);

}

output :

enter your string rahul rahul