Question

[yuyu909]

Hello everybody,

Can anybody explain to me what does the following example mean. Or any of you can show me the reference to explain it?

#define MESSAGE(MID,Respn) (MID = *((unsigned int *)Respn))

Thanx.

[prog-bman]

That would take two variables and cast respn to an unsigned int pointer and assign the value stored at that address to MID.

unsigned int x = 10;
unsigned int y = 0;

MESSAGE(x, &y);

printf("%u", x);

Not a great example but it should work.

[vart]

That would take two variables and cast respn to an unsigned int pointer and assign the value stored at that address to MID.

unsigned int x = 10;
unsigned int y = 0;

MESSAGE(x, &y);

printf("%u", x);

Not a great example but it should work.

actually more interesting example would be

unsigned int x;
float y = 2.34;

MESSAGE(x, &y);

printf("%u", x);