Nov 30, 2019 · It's worth mentioning that the likely purpose of this code, especially when used with %s, is to print a sub-string of the original string. In this use case, str would point to somewhere inside the original string (possibly at the beginning), and str_len will specify the length of the sub-string that should be printed.

Sep 2, 2017 · * Causes fprintf to pad the output until it is n characters wide, where n is an integer value stored in the a function argument just preceding that represented by the modified type. printf("%*d", 5, 10) //will result in "10" being printed with a width of 5.

Nov 11, 2022 · Using %s in scanf without an explcit field width opens the same buffer overflow exploit that gets did; namely, if there are more characters in the input stream than the target buffer is sized to hold, scanf will happily write those extra characters to memory outside the buffer, potentially clobbering something important.

sed 's/\n//' file # to delete newlines from each line sed 's/\n/foo\n/' file # to add a word to the end of each line will NEVER work, because the trailing newline is removed before the line is put into the pattern space. To perform the above tasks, use one of these scripts instead:

Feb 12, 2015 · sscanf(s, "%d %n", &i, &n) == 1 will be true. Therefore the other part of the && expression will execute. And s[n] will access some random place in memory because n is uninitialized. Interpreting the format: "%d %n" Attempts to scan a number which may be a decimal number or an integer or a scientific notation number.

May 14, 2017 · If you open the file in binary mode \n will give you a "unix style" line ending and "\r\n" will give you a "dos style" line ending. If you open the file in "text" mode on a dos/windows system then when you write \n the file handling code converts it to \r\n. So by opening a file in text mode and using \n you get the platform specific line ending.

Dec 6, 2012 · That is: \s matches a space( ) or a tab(\t) or a line(\n) break or a vertical tab(\x0B sometimes referred as \v) or a form feed(\f) or a carriage return(\r) . \\s*,\\s* It says zero or more occurrence of whitespace characters, followed by a comma and then followed by zero or more occurrence of whitespace characters.

Aug 29, 2021 · The %*s usage in the printf format string prints a %s specifier (in this case the empty string "") using a field width of n characters. An explanation of basic printf principles is basically outside the scope of this question (and answer); I'd recommend reading the printf documentation or asking your own separate question on SO.

name = 0xbff5391b &name[0] = 0xbff5391b name printed as %s is siva *name = s name[0] = s So 'name' is actually a pointer to the array of characters in memory. If you try reading the first four bytes at 0xbff5391b, you will see 's', 'i', 'v' and 'a'

N Dice problem with Sum and Disivibility Has Russia ever explained its U-turn on going to war with Ukraine? Roughly, can you make smooth groups by filling holes in discrete groups?