Check out example codes for "excel number format placeholder cheat sheet". It will help you in understanding the concepts better.

Code Example 1

EXCEL NUMBER FORMAT PLACEHOLDER CHEAT SHEET

         Description              Value      Format        Formatted                      
----------------------------------------------------------------------
General	 Default format	          1234.567   General       1234.567                       
                                                                                         
#        Placeholder for digits   1234.567   #####.####	   1234.567                       
         (numbers) and does not                                                          
         add any leading zeroes                                                          
0        Placeholder for digits   1234.567   00000.0000    01234.5670                     
         (numbers) and add any                                                           
         leading zeroes	                                                                 
?        Placeholder for digits   1234.567   ?????.????    1234.567                       
         (numbers) and add space                                                         
         characters                                                                      
.        Placeholder for the      1234.567   0.00          1234.57                        
         decimal place 	                                                                 
_        Adds a blank space to    99         _(#_);(#)     99                            
         the width of the         -25        _(#_);(#)    (25)                           
         following character.     58         _(#_);(#)     58                            
         Use in combination with  12         _(#_);(#)     12                            
         parentheses to add left  -71        _(#_);(#)    (71)                           
         and right indents,       36         _(#_);(#)     36                            
         _( and _) respectively   -99        _(#_);(#)    (99)                           
*        Repeats the character    66         0 *!          66 !!!!!!!!                    
         after the asterisk       FullName   @ *_          FullName __                    
         until the width of the   Item       @*.           Item.......                    
         cell is filled           0          @*=           0==========                    
%        Convert value to a       0.12       %             12%                            
         percentage with          0.125      0.0%          12.5%                          
         % sign	                  0.1275     0.00%         12.75%                         
,        Thousands separator      1234.567   #,            1                              
                                  12345678   #,            12,346                         
                                  12345678   #,###,        12,346                         
                                  12345678   #,,           12                             

E        Scientific notation      1234.567   0.00E+00      1.23E+03                       
         format. Requires a ‘+’                                                          
         symbol after, and a                                                             
         digit placeholder                                                               
         before and after                                                                

/        Represents fractions      1.234      # ##/##	       1 11/47                        
                                   1.234      # 000/000        1 117/500                      
                                   1.234z     ##/##            58/47                          
""       Text placeholder for      1234.567   #,##0 "km/h"     1,235 km/h                
         multiple characters	   Good       "Result is: "@   Result is: Good           
\        Text placeholder for      1234       #.00, \K	       1.23 K                    
         single character          1234567    #.00,, \M        1.23 M	                 
@        Placeholder for text      Bad        "Result is: "@   Result is: Bad            
                                                                                         
[color]  Change Color of value: [Green]#,##0.00_);[Red](#,##0.00);[Blue]0.00_);[Magenta]@
         Options:                                                                        
         [Black], [Green],         1234.567                    Prints in GREEN           
         [White], [Blue],          -1234.567                   Prints in RED             
         [Magenta], [Yellow],      0                           Prints in BLUE            
         [Cyan], [Red]	           This is a text              Prints in MAGENTA

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