View Compilation Error

0_0_19609959_7136.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_19609959_7136.cpp:2:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_19609959_7136.cpp:3:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_19609959_7136.cpp:4:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_19609959_7136.cpp: In function 'int main()':
0_0_19609959_7136.cpp:10:2: error: 'cin' was not declared in this scope
  cin>>cas;
  ^
0_0_19609959_7136.cpp:20:16: error: 'sqrt' was not declared in this scope
    x1=sx+sqrt(y);
                ^
0_0_19609959_7136.cpp:23:46: error: 'printf' was not declared in this scope
   printf("Case %d: %.6lf %.6lf\n",cas_c,x1,y1);
                                              ^
0_0_19609959_7136.cpp:26:10: error: 'getchar' was not declared in this scope
  getchar();
          ^