Main.cc: In function 'int main()': Main.cc:7:11: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] else if(a&2==0) ^ Main.cc: At global scope: Main.cc:12:2: error: expected unqualified-id before 'return' return 0; ^ Main.cc:13:1: error: expected declaration before '}' token } ^