C中的指针和typedef

Question

In C,

int* a, b;

Will make a an integer pointer and b an integer.

What about this? Is b an integer or an integer pointer?

typedef int* foo;
foo a, b;

Answer 1

In C, typedef is not a preprocessor directive: unlike #define , it is not a textual substitution. It gives an alternative name to an existing type, so both a and b will be of the same type - namely, foo , which is an alias for int* . Moreover, you can write this:

foo a, *b;

to make a an int* and b an int** .