• Enjoys Math (6/6) Jan 29 2016 I want to compute the points of a regular polygon in a loop:
• Steven Schveighoffer (10/16) Jan 29 2016 uint is promoted to float/double with a binary math operation. You could...

Enjoys Math <enjoysmath gmail.com> writes:

I want to compute the points of a regular polygon in a loop:

float r = 1.0;

for (uint k=0; k < numVerts; k++) {
    vertlist ~= Vec2D(r * cos(k/n * 2 * PI), ...)
}

How do I make sure k/n is a float or double?

Steven Schveighoffer <schveiguy yahoo.com> writes:

On 1/29/16 6:48 PM, Enjoys Math wrote:
 I want to compute the points of a regular polygon in a loop:

 float r = 1.0;

 for (uint k=0; k < numVerts; k++) {
     vertlist ~= Vec2D(r * cos(k/n * 2 * PI), ...)
 }

 How do I make sure k/n is a float or double?

uint is promoted to float/double with a binary math operation. You could 
simply reverse the order of your expression:

2 * PI * k/n

But if you want to force a type change with simple conversions such as 
these, just use a constructor:

float(k) / n * 2 * PI

There is no need to cast or use `to` (though both of those would be 
equivalent to simple conversion).

-Steve