View Compilation Error

0_0_28730838_17299.cpp: In function 'int main()':
0_0_28730838_17299.cpp:20:21: error: conflicting declaration 'double z'
         double jiao,z=sqrt(x*x+y*y),h;
                     ^
0_0_28730838_17299.cpp:15:13: note: previous declaration as 'int z'
         int z;
             ^
0_0_28730838_17299.cpp:23:9: error: expected ';' before 'if'
         if(h<=b)
         ^