How do data types work after const in C?

Question

How do data types work after const in C?

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#1 by (4 votes)

1

I'm reading some code and I came across the following code

#define foo unsigned int
#define i typedef

I know how this unsigned and signed, typedef etc works, but I can not figure out how this works on the constant.

c

asked by anonymous 19.09.2016 / 21:07

1 answer

Variable in Clojure Requested angularjs being executed first incorrectly

score 4 · Accepted Answer

This example shown in the question is not useful at all, except to demonstrate the #define directive.

The result of this is as follows:

#define foo unsigned int
#define i typedef

// bla bla bla

foo x;     // literalmente: "unsigned int x;"
i int y;   // literalmente: "typedef int y;"
y z;       // literalmente: "int z;"

As I said above, this example is not useful at all, just to demonstrate the #define directive. Obviously, the #define directive is very useful and appears a lot in the C language libraries themselves.