CODEWITHSUNDEEP
rubyformattingescapingprintfstring-formatting
Zack
Zack

Reputation: 6606

How do I properly escape % in call to printf in Ruby?

How do I properly escape % in call to printf in Ruby?

When I try to use %% (as in C), 

value = 47
printf "To have a 60%% test average, your final exam must be at least %0.2f.\n" % [value]

I get this error:

$ ruby /tmp/test.rb 
/tmp/test.rb:4:in `printf': malformed format string - %t (ArgumentError)
    from /tmp/test.rb:4:in `<main>'

It appears that the % is being interpolated into the string before the string is checked for format arguments (i.e., the "... %% test ..." appears to be getting interpreted as "... %test ..."); however, I don't know the correct way to set up the format string.

Upvotes: 0

Views: 1672

Answers (1)

dwilkins
dwilkins

Reputation: 2131

You should pass value as an argument to printf

printf "To have a 60%% test average, your final exam must be at least %0.2f.\n",value

Upvotes: 2

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