View Compilation Error

0_0_34669808_22508.cpp: In function 'void mergee(int, int)':
0_0_34669808_22508.cpp:15:10: error: 'hei' cannot be used as a function
  if(hei(x)==hei(y))
          ^
0_0_34669808_22508.cpp:15:18: error: 'hei' cannot be used as a function
  if(hei(x)==hei(y))
                  ^
0_0_34669808_22508.cpp:17:8: error: 'hei' cannot be used as a function
   hei(x)++;
        ^
0_0_34669808_22508.cpp:20:10: error: 'hei' cannot be used as a function
  if(hei(x)>hei(y))
          ^
0_0_34669808_22508.cpp:20:17: error: 'hei' cannot be used as a function
  if(hei(x)>hei(y))
                 ^
0_0_34669808_22508.cpp:22:8: error: 'set' cannot be used as a function
   set(y)=x;
        ^
0_0_34669808_22508.cpp:25:8: error: 'set' cannot be used as a function
   set(x)=y;
        ^