modulo operation using numbers in exponential form

Question

I have a small question. How come when I write this:

ComPrimSideCtr = (ComPrimSideCtr + 1) % 1.0E+6;

I get the error message: #31 expression must have integral type, but when I write:

ComPrimSideCtr = (ComPrimSideCtr + 1) % 1000000;

I don't get any error messages at all? Isn't 1.0E+6 the same number as 1000000?

Thanks in advance!

Answer 1

The e-notation (scientific notation) in C like this 1.0E+6 is used only for floating-point constants.

Since C doesn't allow floating point operands for % operator, it emits that error message.

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Isn't 1.0E+6 the same number as 1000000

No, 1.0E+6 is equivalent to 1000000.0 which is by default assumed as a double constant (double precision floating point). While 1000000 is a integer ( int ) constant.