#include <stdio.h> // or cstdio
int printf(const char *format,...);
Print formatted output text to standard output (stdout).
#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
%[flags][width][.percision][length]type
| flag | description |
|---|---|
| - | align left |
| + | print sign |
| 0 | extra zeros padding |
| space | print space before number, when no sign |
| # | other format |
Minimal output characters width.
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 | description |
|---|---|
| h | short / unsigned short |
| l | long / unsigned long |
| L | long double |
| 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 % | % |
