Getting "cannot convert double to float" error when using Math.Pow

Question

I have the following:

        int val1 = 2;
        float val2 = (float)val1;

        decimal val3 = 3.2m;
        float val4 = (float)val3;

        float Result2 = Math.Pow(val4, val2);

It seems to me supposedly val4 and val2 are both in the float type. However i get a error on Math.Pow everytime signaling it can't convert type double to type float implicitly. I think i'm casting everything correctly, am I missing something?

The error message means exactly what it says: "can't convert [*double* -> *float*]". It can trivially reproduced: `double d = 1; float f = d;` So then find out which double expression is attempted to be used as a float. Now the problem is isolated a simple solution is present, as shown by R.T. Alternatively, use `double` over `float` everywhere and avoid the conversions. — user2864740, Aug 31 '14 at 18:20

Rahul Tripathi · Accepted Answer · 2014-08-31T18:20:03.183

6

Math.Pow takes two double arguments and returns a double - there is no implicit conversion from double to float. And you cannot put the double in a float variable so you need to typecast that to float.

You may try this:

float Result2= (float)Math.Pow(val4, val2);

edited Aug 31 '14 at 18:20

answered Aug 31 '14 at 18:15

Rahul Tripathi

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The floats are resolved to doubles without a problem, that's not the issue. It's that the resulting `double` cannot be placed inside the `float` variable. – Jeroen Vannevel Aug 31 '14 at 18:18
So he takes doubles or floats in the val3 / val4, but the result has to be a double? That solved it, Thank you – ng80092a Aug 31 '14 at 18:21
2

@JeroenVannevel:- Indeed. Updated that in my answer. Thanks :) – Rahul Tripathi Aug 31 '14 at 18:22

Getting "cannot convert double to float" error when using Math.Pow

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