The 's' replaces one particular House match at any given time though the 's+' replaces the whole space sequence without delay with the 2nd parameter.
On the other hand x.replaceAll("s+", ""); will probably be a lot more successful strategy for trimming spaces (if string may have many contiguous Areas) mainly because of doubtless a lot less no of replacements owing the to fact that regex s+ matches one or even more Areas without delay and replaces them with empty string.
so "indent" specifies the amount Room to allocate for your string that follows it within the parameter record.
Applying %s in scanf with no an explcit field width opens the exact same buffer overflow exploit that gets did; namely, if you will discover much more figures from the enter stream compared to focus on buffer is sized to carry, scanf will Fortunately generate These added figures to memory exterior the buffer, likely clobbering something crucial. However, contrary to in printf, You can not offer the sector with being a run time argument:
This is certainly pretty conventional error-checking code to get a Python script that accepts command-line arguments.
The real difference lies in how it get's managed. In case you might have a group of (for example) three spaces straight following each other s+ can take that group and turns The here complete it into a "", although s would proces each and every space By itself.
And because your second parameter is vacant string "", there isn't a distinction between the output of two cases.
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The width is not really laid out in the format string, but as an additional integer benefit argument preceding the argument that has to be formatted.
If the value to be output is fewer than 4 character positions huge, the value is correct justified in the field by default.
If the value is larger than four character positions extensive, the sphere width expands to accommodate the right quantity of figures.
So the primary if statement translates to: in the event you haven't handed me an argument, I'll inform you how it is best to move me an argument Later on, e.g. you'll see this on-monitor: