View Compilation Error

0_0_36378002_22688.cpp:11:9: error: 'xd' was not declared in this scope
 int cmp(xd a,xd b)
         ^
0_0_36378002_22688.cpp:11:14: error: 'xd' was not declared in this scope
 int cmp(xd a,xd b)
              ^
0_0_36378002_22688.cpp:11:18: error: expression list treated as compound expression in initializer [-fpermissive]
 int cmp(xd a,xd b)
                  ^
0_0_36378002_22688.cpp:12:1: error: expected ',' or ';' before '{' token
 {
 ^
0_0_36378002_22688.cpp: In function 'int main()':
0_0_36378002_22688.cpp:47:4: error: 'e' was not declared in this scope
    e[i]=P(x,y);
    ^
0_0_36378002_22688.cpp:49:8: error: 'e' was not declared in this scope
   sort(e+1,e+1+n);
        ^