Program to input a number from user number and then find square root of this number in C

/* program to find square root */
# include <stdio.h>
# include <math.h>
void main ()
{
int a,b ;
clrscr () ;
printf ("/n enter a number:") ;
scanf ("%d", & a) ;
b =   sqrt (a) ;
printf ("/n sqrt of a %d", b) ;
getch () ;
}