Can't find location of implicit cast

Question

I'm trying to find the total of two given number arrays for my assignment, but I keep receiving the error:

Cannot implicitly convert type 'double' to 'int'. An explicit conversion exists (are you missing a cast?)

int[] firstarray= new int[4] { 4, 20, 60, 150 };
double[] secondarray= new double[4] { 5, 40.5, 65.4, 145.98 };

firstarray[0] = 20;
secondarray[1] = 5;

int totalarrays = firstarray[0] + secondarray[1];
Console.WriteLine("Total of the two arrays " + totalarrays);

`int totalarays = firstarray[0] + secondarray[1];` You're doing math with a double and trying to contain it in integer `totalarays`. — Drew Kennedy, Sep 02 '16 at 12:08
`var totalarrays = firstarray[0] + secondarray[1];` (please, notice, `var`) and let compiler find out the type for you. — Dmitry Bychenko, Sep 02 '16 at 12:18
The error means exactly what it says - you're trying to put a double in an int but there's no implicit conversion from double to int (nor should there be as it would entail a potential loss of information). — EJoshuaS - Stand with Ukraine, Sep 02 '16 at 18:58

score 1 · Accepted Answer · edited May 23 '17 at 11:51

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int totalarays = firstarray[0] + secondarray[1];

should be

double totalarays = firstarray[0] + secondarray[1];

An int + a double ends up in a double. If it didn't you would lose the precision of the double in the result - there is no implicit way to do that.

If you need to convert the double to an int there are many different techniques depending on your requirements.

edited May 23 '17 at 11:51

Community

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answered Sep 02 '16 at 12:11

DaveShaw

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score 0 · Answer 2 · answered Sep 02 '16 at 12:10

When you do

int totalarays = firstarray[0] + secondarray[1];

You are trying to add a double (secondarray[1]) and an int (firstarray[0]), and convert the result to an int. This could lose precision, because the decimal part of the double value will be removed by rounding down. This is what the compiler is warning you about.

To indicate that you're happy with it, you can write:

int totalarays = firstarray[0] + (int)secondarray[1];

This is explicitly converting the double value to an int, by means of a cast.

score 0 · Answer 3 · edited Sep 02 '16 at 18:38

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This should work.

int totalarrays = firstarray[0] + Int32.Parse(secondarray[1].ToString());

edited Sep 02 '16 at 18:38

Guillaume Racicot

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answered Sep 02 '16 at 13:56

FreeMan

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Can't find location of implicit cast

3 Answers3