Formatting numbers

String formatting on numbers is very useful for creating readable output. This can be done through the use of the number object’s ToString() method.

A common practice is printing out mathematical operations with the use of the ToString() method on the double object. What usually happens is the printing of a long string containing all the decimal places existing in the double. This sometimes makes output cluttered and hard to read. Luckily, C# has a robust set of string formatting options available to make the string more comprehendible.

double c = 10.25693;

Print("No formatting: " + c.ToString());

Print("Currency formatting: " + c.ToString("C"));

Print("Exponential formatting: " + c.ToString("E"));

Print("Fixed-point formatting: " + c.ToString("F2"));

Print("General formatting: " + c.ToString("G"));

Print("Percent formatting: " + c.ToString("P0"));

Print("Formatted to 2 decimal places: " + c.ToString("N2"));

Print("Formatted to 3 decimal places: " + c.ToString("N3"));

Print("Formatted to 4 decimal places: " + c.ToString("N4"));