View Compilation Error

0_0_32125518_15447.cpp: In function 'int main()':
0_0_32125518_15447.cpp:11:9: error: 'Ldouble' was not declared in this scope
         Ldouble tmp=(X1-X2)*(X1-X2)+(Y1-Y2)*(Y1-Y2);
         ^
0_0_32125518_15447.cpp:12:24: error: 'tmp' was not declared in this scope
         double ans=pow(tmp,0.5);
                        ^