How can I prevent "- : unit = ()" from appearing after my output in the ocaml toplevel?

This code

for i=0 to 5 do print_string "a" done;;

will output

aaaaaa- : unit = ()

But how can I output just "aaaaaa" without outputting the value of for-e开发者_如何学Goxpression?

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You are not really printing the value of the expression; it's just that you are within the session of the interpreter, which by default prints the value/type of the evaluated expression. If you compiled your program it would just print the a's.

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You could compile your program; this way you won't get the type information from the interpreter -- which is : unit = ()