View Compilation Error

0_0_37722771_12750.c: In function 'main':
0_0_37722771_12750.c:15:7: error: expected expression before 'int'
   x = int((sqrt(1.0 + 8.0*n) -1)/2);
       ^
0_0_37722771_12750.c:16:7: error: expected expression before 'int'
   y = int(n-x*(x+1)/2);
       ^
0_0_37722771_12750.c:20:7: error: expected expression before 'int'
    if(int(x)%9 == 0)
       ^
0_0_37722771_12750.c:23:20: error: expected expression before 'int'
     printf("%d\n", int(x)%9);
                    ^