Main.cc: In function 'int main()':
Main.cc:5:17: error: unable to find numeric literal operator 'operator""a'
if(a==1&&a==3a==&&5){
^
Main.cc:5:17: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes
Main.cc:5:23: error: expected identifier before numeric constant
if(a==1&&a==3a==&&5){
^
Main.cc:5:23: error: expected ')' before numeric constant