c - Convert int to double

Question

I ran this simple program, but when I convert from int to double, the result is zero. The sqrt of the zeros then displays negative values. This is an example from an online tutorial so I'm not sure why this is happening. I tried in Windows and Unix.

/* Hello World program */

#include<stdio.h>
#include<math.h>

main()

{  int i;

   printf(" Number  Square Root of Number

");

   for (i=0; i<=360; ++i)
        printf(" %d  %d 
",i, sqrt((double) i));


}

Answer 1

Maybe this?

int number;
double dblNumber = (double)number;