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C#:Format Printing

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The Write method provides a powerful and succinct mechanism for solving many formatting problems.

The printf method

The Write method takes a formatting string followed by any number of additional parameters. The formatting string includes a number of braces {} - each of these is substituted by the actual parameter given. 
{0}  is used for the first parameter
{1}  is used for the second parameter


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Using printf to align

We can format output involving fixed and variable components. Usually we align strings to the left and numbers to the right.


In the printf a number of values may follow the format string. These values are used up by % placeholders in the format string.

The format string is 
"Country: {0,-18} GDP: {1,20:n0}\n"
{0,-18}
0 means the first parameter is used here
the minus in -18 means align left,

the 18 means 18 characters are to be used, the s is for string.

{1,20:n0}
1 means the second parameter goes here
20:n0 means use 20 spaces for the number, use 0 decimal places
\n::This starts a new line.
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