What will this C code do?

void main(){
int x=1;
printf("%d\n",x=2);
}

>>159
No. Global variables can have linkage you moron.
I said they cannot have no linkage. The only variables with no linkage are those declared at block scope or function prototype scope. That isn't to say that variables with block scope can't have external linkage (they can if you use the extern storage-class specifier). Check out the standard:

The following identifiers have no linkage: an identifier declared to be anything other than an object or a function; an identifier declared to be a function parameter; a block scope identifier for an object declared without the storage-class specifier extern.