Calculation of square root of a number using power function in C

//Calculation of square root

#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

 double a,b;

 clrscr();

 printf("Enter any number\n");

 scanf("%lf",&a);

 b=pow(a,0.5);

 printf("The sq root of the number is = %lf",b);

 getch();

}