The main regex will match a single whitespace character. The second regex will reluctantly match a number of whitespace figures. For many reasons, both of these regexes are very identical, other than in the second circumstance, the regex can match additional on the string, if it stops the regex match from failing. from
Utilizing %s in scanf without an explcit discipline width opens the identical buffer overflow exploit that will get did; specifically, if you will find additional people within the input stream in comparison to the focus on buffer is sized to carry, scanf will happily generate These added figures to memory exterior the buffer, likely clobbering some thing crucial. However, in contrast to in printf, You can not source the sphere with to be a operate time argument:
All the examples offered underneath use arrays which hasn't been taught nevertheless, so I'm assuming I can't use %s nevertheless both.
Windows, which derives in the end from CP/M and VAX, doesn't use this system internally. To the working technique, the command line is just only one string of figures.
In a few code that I've to maintain, I have witnessed a structure specifier %*s . Can anybody inform me what This is often and why it really is used?
anubhavaanubhava 781k6666 gold badges590590 silver badges660660 bronze badges Incorporate a remark
What's the origin, specific which means, and reason of labelling the string section "Archi" within an orchestral rating?
The primary just one matches one whitespace, whereas the next 1 matches a person or a lot of whitespaces. They are the so-referred to as regular expression quantifiers, they usually perform matches such as this (taken with the documentation):
This is quite conventional mistake-checking code for a Python script that accepts command-line arguments.
five @powersource97, %.*s implies you might be reading the precision worth from an argument, and precision is the most range of figures for being printed, and %*s that you are reading the width worth from an argument, that is the least amount os characters to generally be printed.
The width isn't laid out in the structure string, but as an extra integer price argument previous the argument that should be formatted.
code that ought to even now pass through a pre-processor. Meaning it might have #contain and #define among other macros. It may be penned as .sx.
Andrew HareAndrew Hare 351k7575 gold badges644644 silver badges640640 bronze badges three 15 Notice that this type of string interpolation is deprecated in favor of the more impressive str.format process.
All I do know is the fact that cmd.exe's command parsing (In particular with escaping characters) might be strange sometimes, so I have little question that /s is useful in at least just one occasion.
Having said that x.replaceAll("s+", ""); is going to be extra effective method of trimming Areas (if string might have various contiguous spaces) mainly because of probably significantly less no of replacements owing the to undeniable fact that regex s+ get more info matches 1 or more Areas at once and replaces them with empty string.
The subsequent if assertion checks to view if the 'database-title' you passed into the script really exists to the filesystem. Otherwise, you will get a information like this: