View Compilation Error

0_0_22854957_15753.cpp:10:1: error: expected unqualified-id before '{' token
 {
 ^
0_0_22854957_15753.cpp: In function 'int main()':
0_0_22854957_15753.cpp:34:62: error: 'ComputePolygonArea' was not declared in this scope
         printf("Case #%d: %.1lf\n",j-T+1,ComputePolygonArea(P));
                                                              ^