What does 0 mean when found in a string in C

Question

In a dictionary like this   Dictionary lt string  string gt  openWith   new Dictionary lt string  string gt      openWith Add  txt    notepad exe    openWith Add  bmp    paint exe    openWith Add  dib    paint exe    openWith Add  rtf    wordpad exe     Console WriteLine  For key     rtf    value    0     openWith  rtf       The output is      For Key    rtf  value   wordpad exe   What does the  0  mean

User · Answer

It s a placeholder in the string   For example   string b    world     Console WriteLine  Hello  0    b     would produce this output   Hello world    Also  you can have as many placeholders as you wish  This also works on String Format   string b    world    string a   String Format  Hello  0    b    Console WriteLine a     And you would still get the very same output

User · Answer

You are printing a formatted string   The  0  means to insert the first parameter following the format string  in this case the value associated with the key  rtf    For String Format  which is similar  if you had something like                Format string                     0             1  String Format  This  0    The value is  1       is a test    42      you d create a string  This is a test   The value is 42    You can also use expressions  and print values out multiple times                 Format string               0   1    2  String Format  Fib   0    0    1    2    1   1 1  1 2     yielding  Fib  1  1  2  3   See more at http   msdn microsoft com en-us library txafckwd aspx  which talks about composite formatting

User · Answer

It s a placeholder for the first parameter  which in your case evaluates to  wordpad exe    If you had an additional parameter  you d use  1   etc

User · Answer

In addition to the value you wish to print  the  0   1   etc   you can specify a format  For example   0 4  will be a value that is padded to four spaces   There are a number of built-in format specifiers  and in addition  you can make your own  For a decent tutorial list see String Formatting in C   Also  there is a FAQ here

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For future reference  in Visual Studio you can try placing the cursor in the method name  for example  WriteLine  and press F1 to pull up help on that context  Digging around should then find you String Format   in this case  with lots of helpful information   Note that highlighting a selection  for example  double-clicking or doing a drag-select  and hitting F1 only does a non-context string search  which tends to suck at finding anything helpful   so make sure you just position the cursor anywhere inside the word without highlighting it   This is also helpful for documentation on classes and other types

User · Answer

This is what we called Composite Formatting of the  NET Framework to convert the value of an object to its text representation and embed that representation in a string  The resulting string is written to the output stream      The overloaded Console WriteLine Method  String  Object Writes   the text representation of the specified object  followed by the   current line terminator  to the standard output stream using the   specified format information

User · Answer

It s a placeholder for a parameter much like the  s format specifier acts within printf   You can start adding extra things in there to determine the format too  though that makes more sense with a numeric variable  examples here

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