Consider this simple example:

/*1*/ int main() {
/*2*/   for (int i(7); i;){break;} 
/*3*/   if (int i(7)) {}
/*4*/ }

Why line-2 compiles just fine, whilst line-3 gives the error? This is little strange to me why if-statement is in this aspect treated worse than for-loop?

If this is compiler specific - I tested with gcc-4.5.1:

prog.cpp: In function 'int main()': prog.cpp:3:7: error: expected primary-expression before 'int' prog.cpp:3:7: error: expected ')' before 'int'

I was inspired by this question

[UPDATE]

I know this compiles just fine:

/*1*/ int main() {
/*2*/   for (int i = 7; i;){break;} 
/*3*/   if (int i = 7) {}
/*4*/ }