<p>Consider the following signature in C#:</p>

<pre><code>double Divide(int numerator, int denominator);
</code></pre>

<p>Is there a performance difference between the following implementations?</p>

<pre><code>return (double)numerator / denominator;

return numerator / (double)denominator;

return (double)numerator / (double)denominator;
</code></pre>

<p>I'm assuming that both of the above return the same answer.</p>

<p>Have I missed any other equivalent solution?</p>

Have you tried comparing the IL (for example, with
Reflector
)?
```
```
static double A(int numerator, int denominator)
{ return (double)numerator / denominator; }

static double B(int numerator, int denominator)
{ return numerator / (double)denominator; }

static double C(int numerator, int denominator)
{ return (double)numerator / (double)denominator; }
```
```
All three become (give or take the name):
```
```
.method private hidebysig static float64 A(int32 numerator, int32 denominator) cil managed
{
    .maxstack 8
    L_0000: ldarg.0 // pushes numerator onto the stack
    L_0001: conv.r8 // converts the value at the top of the stack to double
    L_0002: ldarg.1 // pushes denominator onto the stack
    L_0003: conv.r8 // converts the value at the top of the stack to double
    L_0004: div     // pops two values, divides, and pushes the result
    L_0005: ret     // pops the value from the top of the stack as the return value
}
```
```
So no: there is exactly zero difference.