View Compilation Error

0_0_30805225_10878.cpp: In function 'int main()':
0_0_30805225_10878.cpp:5:2: error: 'nbsp' was not declared in this scope
     double x1,y1,x2,y2,;
  ^
0_0_30805225_10878.cpp:5:34: error: expected unqualified-id before ';' token
     double x1,y1,x2,y2,;
                                  ^
0_0_30805225_10878.cpp:8:29: error: 'd' was not declared in this scope
         d=sqrt(((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)));
                             ^