printf - Read For Learn

Taking a new line using printf in java? Is %n correct?

Yes, %n is a newline in printf. See the documentation of java.util.Formatter, specifically the conversion table which specifies: ‘n‘ line separator The result is the platform-specific line separator Your output currently only has a linebreak at the end, not at the points that you seem to want them. You would need to use a format like: (and maybe … Read more

stack around the variable…was corrupted

Why did you declare you character buffer a size of 20? More than likely the sprintf placed more characters than that can fit in myChar. Instead, use safer constructs such as std::ostringstream or at the very least, declare you char arrays much bigger than you would expect (not the best way, but would at least … Read more

write() to stdout and printf output not interleaved?

Printf is buffered. You can force printf to ‘flush’ its buffer using the fflush call: In general, printf() being buffered is a good thing. Unbuffered output, particularly to visible consoles that require screen updates and such, is slow. Slow enough that an application that is printf’ing a lot can be directly slowed down by it (especially on … Read more

What does %s mean inside a string literal?

%s is a C format specifier for a string. means “where you see the first %s, replace it with the contents of command as a string, and where you see the second %s, replace it with the contents of context->user as a string.

What do \t and \b do?

Backspace and tab both move the cursor position. Neither is truly a ‘printable’ character. Your code says: print “foo” move the cursor back one space move the cursor forward to the next tabstop output “bar”. To get the output you expect, you need printf(“foo\b \tbar”). Note the extra ‘space’. That says: output “foo” move the cursor … Read more