View Compilation Error

0_0_39238926_26171.cpp: In function 'int main()':
0_0_39238926_26171.cpp:2:11: error: expected primary-expression before '=' token
    2 | #define PI=3.1415927;
      |           ^
0_0_39238926_26171.cpp:10:29: note: in expansion of macro 'PI'
   10 |                 v = 4 / 3 * PI * r * r * r;
      |                             ^~
0_0_39238926_26171.cpp:10:32: error: invalid type argument of unary '*' (have 'double')
   10 |                 v = 4 / 3 * PI * r * r * r;
      |                                ^~~