Ocaml printing one statement after another -


i new ocaml , ml in general , have been having fundamental issue. using pattern match , within 1 match print 2 or more concatenated statements. eg. chan^"("^var^")"^op2^(poc p); chan^"("^var^")"^op^(poc p)

let processoperatorchange2 t2s2 proc2 op op2=   let rec poc2 p = match p     | 0 ->  "0"     | pproc (x) -> string.lowercase x     | in(chan, var, _, p, _) ->  chan^"("^var^")"^op^(poc2 p); chan^"("^var^")"^op2^(poc2 p)   in poc2 proc2

but each time run this, statement printed last 1 after semi colon. can this?

your function not print statement builds string, returns value, , doesn't perform side-effects. semicolon operator, when interspersed between 2 expressions, doesn't combine value produced these expressions, if have "hello"; "world" result "world". happens in case when do

chan^"("^var^")"^op^(poc2 p); chan^"("^var^")"^op2^(poc2 p)

everything on lift thrown away.

a quick fix concatenate them, e.g.,

chan^"("^var^")"^op^(poc2 p) ^ ";\n" ^ chan^"("^var^")"^op2^(poc2 p)

but in general, idiomatic way print ast use format module, , implement recursive pp function, has type format.formatter -> 'a -> unit. note return type, function doesn't build string (that operation of quadratic complexity), rather prints generic output stream.


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