View Compilation Error

0_0_26823007_14955.cpp: In function 'int main()':
0_0_26823007_14955.cpp:5:15: error: expected initializer before numeric constant
  const int PI 3.14159;
               ^
0_0_26823007_14955.cpp:9:24: error: 'PI' was not declared in this scope
  printf("%f.3\n",&(4/3*PI*a*a*a));
                        ^