printf

Syntax:

#include <stdio.h> // or cstdio

int printf(const char *format,...);

Description:

Print formatted output text to standard output (stdout).

Example:

#include <stdio.h>

 

main()

{

    long x = 200000;

    double y = 0.0088;

    char str[10] = "John Smith";

 

    int val=printf("x=%d, y=%f\nname: %s",x,y,str);

 

    if( val == -1 )

        return -1

    retrun 0;

}

Will print:

x=200000, y=0.0088

name: John Smith

Printf format:

Syntax:

%[flags][width][.percision][length]type

 

Flags (optional):

flag	description
-	align left
+	print sign
0	extra zeros padding
space	print space before number, when no sign
#	other format

 

Width (optional):

Minimal output characters width.

 

Percision (optional):

Set the number of digits after the decimal point for number print.

Set the maximum number of characters to be printed for a string print.

 

Length (optional):

length	description
h	short / unsigned short
l	long / unsigned long
L	long double

 

Type:

type	description	variable type	print format
c	unsigned character	unsigned char	c
d i	signed decimal integer	int	[-]dddddd
u	unsigned decimal integer	unsigned int	dddddd
x	unsigned hexadecimal integer - lower case a..f	unsigned int	hhhhhh
X	unsigned hexadecimal integer - upper case A..F	unsigned int	HHHHHH
o	unsigned octal integer	unsigned int	oooooo
f	floating point number	double	[-]ddd.ddd
e	floating point number	double	[-]ddd.dddedd
E	floating point number	double	[-]ddd.dddEdd
g	minimal length format selection: %f or %e	double
G	minimal length format selection: %f or %E	double
p	address of pointer	void *	hhhhhhhh
s	print string	char *
n	argument get the number of characters written by printf	int *
%	print %		%

 

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Escape sequences

C Standard library functions

printf on wikipedia