View Compilation Error

0_0_32480644_5003.cpp: In function 'int main()':
0_0_32480644_5003.cpp:8:12: error: 'r1' was not declared in this scope
   t=(float)r1;
            ^
0_0_32480644_5003.cpp:9:11: error: expected ';' before numeric constant
   T=(r*PI)2;
           ^