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3.5.2. Reading Values From Arrays
You can also read values from an array the same way you would read the value of a variable. To do so, include the array_name[index_expression] statement as an element in a mathematical expression. For example:
Example 3.13. Using Array Values in Simple Computations
The construct in Example 3.13, “Using Array Values in Simple Computations” computes a value for the variable delta by subtracting the associated value of the key tid() from the current gettimeofday_s(). The construct does this by reading the value of tid() from the array. This particular construct is useful for determining the time between two events, such as the start and completion of a read operation.