What is the default type & size of a numeric constant in C?

dissectcode

If I have a function

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funct( uint32 x )

{

 stuff

}

and call it:

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funct( 3 );

what is the type and size of 3? Is it a long unsigned integer? Or 16 bits or what?

What happens if I call:

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funct( -3 );

? Will the -3 be converted? I know this should be common knowledge but I can't find this information and don't know for sure.

weaknessforcats

You can find this in any book on C or by Googling for it.

Symbolic constants like 3 are type int. Use sizeof(int) to see how large the the variable is on your machine. Constants like 3.14 are type double. Again, use sizeof(double).

As to what is converted research the topic "automatic comversions". In the case of calculations research "promotions".

Banfa

You can create constants of type unsigned int, long, unsigned long, float and in C++ char. Looking at any basic C++ reference should tell you how.

What is the default type & size of a numeric constant in C?

re: What is the default type & size of a numeric constant in C?

re: What is the default type & size of a numeric constant in C?

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