C + + learning (vi) output

The output of learning notes (in fact, there is no use, save for yourself to see)

printf for Output Content console black window
printf ("What to Output"); can be any Content
-If you want to output a variable

1. Format placeholder (format placeholder string)
%d receive int type output signed 10 binary
%f is the same with%f or%LF when it receives float type output.
%c receives char type output character
%LF Receive double type
%s Receive String type
%o Output an integral type with unsigned 8 binary
%x%x unsigned 16 binary output an integral type
%u unsigned 10-binary integer (no negative number)
%e decimal in the form of%e index
%g%g Output floating point type (select short width in%e and%lf for output)

2. Control output

2.1 Minimum output width output how many characters
%2d minimum output two-bit digit position not enough space to be filled in (default front blank is the default right alignment) enough to output
356-->%2d

2.2 Decimal digits of precision (only for decimals)
%.9lf. 9 means that precision retains 9 digits
The%M.NLF-->m represents the minimum number of output bits. N means keeping several decimals

2.3 Symbols
+-0 # spaces
+ Front output a symbol%+d
-Control to align left
0 digits not enough front padding 0 for left-justified%03d
# for%o%x has an effect if it is 8 binary final output result plus 0 if it is 16 binary front plus 0x
Space% d If a positive number in front fill a space negative number without tube
\ t can also control the alignment

2.4 Length H means short l for long
Long->long int%ld
Short->short int%HD
Long Long%lld

%f flaot type->%LF doublt

--General format placeholders
%[mark [Minimum width] [precision] [length] Type

Symbol 10 decimal places reserved 2-bit decimal floating point type
%+10.2lf

Single characters enclosed in single quotation marks cannot be split ' M '
A string of multiple characters can be split in double quotes "" "" Hello "
Special characters \+ other content
' \ t ' tab tab
' \ n ' newline
' \ \ ' escape character

printf output

************************************************************/

Practice Code

Effect

C + + learning (vi) output