View Compilation Error

0_0_18557141_6492.cpp:224:10: error: unable to find numeric literal operator 'operator""_7'
 _4 _5 _6=1_7-10;
          ^
0_0_18557141_6492.cpp:224:10: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes