View Compilation Error

0_0_34992161_10787.cpp: In function 'int main(int, char**)':
0_0_34992161_10787.cpp:7:16: error: unable to find numeric literal operator 'operator""c'
   if(t>=90&&t<=100c) printf("A\n");
                ^
0_0_34992161_10787.cpp:7:16: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes