View Compilation Error

0_0_22162276_5775.cpp:3:9: error: macro names must be identifiers
 #define ƨ3.1415927
         ^
0_0_22162276_5775.cpp: In function 'int main()':
0_0_22162276_5775.cpp:9:9: error: 'pi' was not declared in this scope
     v=4*pi*r*r*r/3;
         ^