View Compilation Error

1_868_1400_14310.cpp:8:1: error: stray '\243' in program
 cout<<(x*x－y*y)/4<<endl;
 ^
1_868_1400_14310.cpp:8:1: error: stray '\255' in program
1_868_1400_14310.cpp: In function 'int main()':
1_868_1400_14310.cpp:8:13: error: expected ')' before 'y'
 cout<<(x*x－y*y)/4<<endl;
             ^