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In an interpolated string, the minimum field width is the minimum number of spaces that should be used to display a value, and if the value is too large to fit in the specified field width, the number will be truncated.

In an interpolated string, if you want a number to be left-justified within its field, you insert a minus sign (-) before the field width specifier.

The char data type provides a single method that determines whether a character is a letter or a number.

You can use a subscript expression such as name[3] = ‘A’ to change the value of a character within a string.

When reading the contents of a file into an array, your loop must always iterate until the array is full.

Assume amount is a decimal variable that has been assigned a value. The following interpolated string formats the value of the amount variable as currency:$”The amount is {amount:Curr}”;

The default value of a string array’s elements is null.

In the following statement, the car variable is argument 1: string message = String.Format(“I own a blue {0}.”, car);

When keeping a running total, the accumulator variable can start with any value and still contain the correct total when the loop finishes.

In order for a program to work with a file on the computer’s disk, the program’s code must create a file object in memory.