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Error: Label used but not defined when using && operator

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http://stackoverflow.com – int main() { int i = 0; int *p = &i; int *q = &&i; return 0; } When compiling this using gcc on Linux, I am getting the error addr.c: In function ‘main’: addr.c:6:2: error: label ‘i’ used but not defined Why is the compiler treating int i as label and not integer? When do we use && operator? EDIT: Okay, I can somewhat understand the answers, but can you explain the below macro definition from "arch/arm/include/asm/processor.h". It doesn't says anything about label, but the comment says, it can return the "program counter" /* * (HowTos)