The primary regex will match one particular whitespace character. The next regex will reluctantly match one or more whitespace people. For many reasons, these two regexes are extremely very similar, other than in the second circumstance, the regex can match far more in the string, if it helps prevent the regex match from failing. from
Applying %s in scanf without having an explcit industry width opens exactly the same buffer overflow exploit that will get did; namely, if you can find far more people within the input stream compared to target buffer is sized to hold, scanf will happily compose All those excess people to memory outside the house the buffer, probably clobbering anything significant. Unfortunately, in contrast to in printf, You cannot provide the sector with as a operate time argument:
Cmd /S may be very practical since it will save you obtaining to bother with "quoting rates". Remember that the /C argument signifies "execute this command as if I'd typed it within the prompt, then quit".
this assignation can be carried out at initialization like char term="this can be a word" // the term array of chars got this string now and is particularly statically outlined
The width is not really laid out in the structure string, but as yet another integer benefit argument previous the argument that needs to be formatted.
exe /S /C "file name with Areas.exe" argument1 would not operate devoid of adding an extra list of quotes, Whilst devoid of /S it would have labored... until you choose to interchange argument1 with more info "argument1".
So the first if statement interprets to: if you haven't passed me an argument, I'm going to tell you how it is best to go me an argument in the future, e.g. you will see this on-display:
The primary 1 matches only one whitespace, whereas the next 1 matches a person or quite a few whitespaces. They're the so-termed frequent expression quantifiers, and they execute matches similar to this (taken through the documentation):
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The width is not really specified in the format string, but as a further integer benefit argument preceding the argument that must be formatted.
Using scanf Along with the %s conversion specifier will quit scanning at the 1st whitespace character; as an example, In case your input stream seems like
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All I am aware is cmd.exe's command parsing (Primarily with escaping characters) is often strange sometimes, so I have little question that /s is useful in at least just one celebration.
Having said that x.replaceAll("s+", ""); might be a lot more economical strategy for trimming spaces (if string may have multiple contiguous Areas) simply because of doubtless much less no of replacements owing the to proven fact that regex s+ matches one or more spaces without delay and replaces them with vacant string.
Is there some subtlety to /s which is eluding me? When would it not at any time be important? When would it even make any difference?