View Compilation Error

0_0_38600421_18627.cpp: In function 'int main()':
0_0_38600421_18627.cpp:16:17: error: unable to find numeric literal operator 'operator""lastDigit'
                 4lastDigit = (lastDigit * base) % 10;
                 ^~~~~~~~~~
0_0_38600421_18627.cpp:16:17: note: use -fext-numeric-literals to enable more built-in suffixes