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To calculate time intervals in C++, follow these steps:

1. Get the starting time using a clock.
2. Perform the operation or code block for which you want to measure the duration.
3. Get the ending time using the same clock.
4. Calculate the difference between the starting and ending times to obtain the elapsed time.
5. Use the provided measurement units to format and present the duration as needed.

Fill in the blank: In step 1, we get the starting time using a ____.