View Compilation Error

0_0_30810049_10302.cpp: In function 'int main()':
0_0_30810049_10302.cpp:4:11: error: expected initializer before 'v'
  double r v PI;
           ^
0_0_30810049_10302.cpp:5:16: error: 'r' was not declared in this scope
  scanf("%.lf",&r);
                ^
0_0_30810049_10302.cpp:6:2: error: 'v' was not declared in this scope
  v=(4/3)*PI*r*r*r;
  ^
0_0_30810049_10302.cpp:6:10: error: 'PI' was not declared in this scope
  v=(4/3)*PI*r*r*r;
          ^
0_0_30810049_10302.cpp:9:1: error: expected ';' before '}' token
 }
 ^