foo.c: In function 'main':
foo.c:3:9: error: declaration for parameter 'b' but no such parameter
    3 | int x,a,b;
      |         ^
foo.c:3:7: error: declaration for parameter 'a' but no such parameter
    3 | int x,a,b;
      |       ^
foo.c:3:5: error: declaration for parameter 'x' but no such parameter
    3 | int x,a,b;
      |     ^
foo.c:8:1: error: expected '}' before 'else'
    8 | else if(x>>a<<b)
      | ^~~~
foo.c:16:1: error: expected declaration or statement at end of input
   16 | }
      | ^