printf and scanf notation

Character	Printed As
d, i	Integer, int
li	long
o	Unsigned octal number (without leading zero, e.g. 0o)
x, X	Unsigned hexadecimal number (without 0x or 0X), abcdef or ABCDEF for 10 – 15
u	Unsiged decimal number
c	Single character, char
s	char*
f	float (m.nnnnnnnnnn, precision decided before the f)
lf	double (m.nnnnnnnnnn, precision decided before the lf)
e, E	float and double (m.nnnnnnn e^x/m.nnnnnnn E^x)
p	void*, implementation dependent

So you type the %, in between the character (s, i, d, etc), you can put in these things (in order).

• A minus sign, indicating left adjustment (padding/min field width)
• A number for the minimum field width, will be padded on the left if there’s no - (in front, and also when the thing you’re printing is less than the min field width)
• Period for precision
• Number of chars to print, or the number of digits after the floating point, or the min digits for an integer

It’s almost the same for scanf() (but no p amongst others), it’s just the removal of the capitals (X, E, etc). Also between the % and the character, there could be a * assignment suppression character.

[!NOTE] scanf() also returns the number of elements read from stdin.

sscanf is a function that reads from a string (char *), instead of stdin.

#C #C/features