/in/foo.c:2:5: error: expected ')' before '<' token
    2 | n (n<100)
      |     ^
      |     )
/in/foo.c:3:5: error: invalid suffix "x" on integer constant
    3 | p = 3x^5+4x^2+1
      |     ^~
/in/foo.c:3:10: error: invalid suffix "x" on integer constant
    3 | p = 3x^5+4x^2+1
      |          ^~