View Compilation Error

0_0_17050249_186.cpp: In function 'int main()':
0_0_17050249_186.cpp:5:12: error: unable to find numeric literal operator 'operator""n'
 for(i=2;i<=2n;i+=2m)
            ^
0_0_17050249_186.cpp:5:12: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes
0_0_17050249_186.cpp:5:18: error: unable to find numeric literal operator 'operator""m'
 for(i=2;i<=2n;i+=2m)
                  ^
0_0_17050249_186.cpp:5:18: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes
0_0_17050249_186.cpp:8:16: error: unable to find numeric literal operator 'operator""n'
 printf("%d",(i+2n)*l/2);
                ^
0_0_17050249_186.cpp:8:16: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes