1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | #include <stdio.h>
#include <stdlib.h>
// TRIVIAL EXAMPLE -- analogous to mu_check() -- but not the same
#define set_x(n) int x = (n)
#define print_x() printf("x == %d\n", x)
#define send_back_x() return x
int f() {
set_x(5);
print_x();
send_back_x();
}
int main(int argc, char* argv[]) {
int z = f();
printf("x == %d\n", x);
printf("z == %d\n", z);
// LESSON: If a macro defines a variable, it only exists in the
// scope where that macro was invoked.
// mu_run(…) cannot access the variable that mu_start(…) declared.
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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