View Compilation Error

0_0_23232739_23666.cpp: In function 'int main()':
0_0_23232739_23666.cpp:29:20: error: unable to find string literal operator 'operator""x'
             printf("%.2lf "x);
                    ^
0_0_23232739_23666.cpp:43:20: error: unable to find string literal operator 'operator""x'
             printf("%.2lf "x);
                    ^