View Compilation Error

0_0_15389581_13654.cpp: In function 'int main()':
0_0_15389581_13654.cpp:5:5: error: unable to find numeric literal operator 'operator""r'
 v=4*3.14r*r*r*r/3;
     ^
0_0_15389581_13654.cpp:5:5: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes