qcdong

math.random just a example. I need a sample way to create a function take arguments like that. another example: func toUpper(string, [start, [end]]) toUpper('abcde') -> ABCDE toUpper('abcde', 1) -> aBCDE...

See test.cpp line 6: ``` if (!x.open("../1.xlsx")) { printf("can't open."); return 1; } ```

I think I fixed. Retry please.