When you define a value in C, how does the compiler select a data type

Question

Just a general programming question: when you define a value in C (or any language, I suppose), how does the compiler know how to handle the value? For instance:

#define CountCycle  100000

I would suggest that it CountCycleis a data type with long integers, but this is just an assumption. I suppose it could also be floata double(and not int, since it does not exceed ~ 32k), etc.

How does the compiler select the data type for the value #define? I do not have an application to answer this question; I'm just curious.

Answer 1

. 100000 CountCycle.

, . 100000 int, , a long, .

. ++ Reference C Reference.

Answer 2

CountCycle . 100000 , .

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#define CountCycle  100000l

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#define CountCycle  100000.0

Answer 3

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#define BUFFER_SIZE 1000

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Answer 4

. 100000 CountCycle.

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#define MY_FLOAT_DATA   (float)4.55
#define MY_INTEGER_DATA (int)4

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