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When a
programmer is crafting a program, it is good practice to break the program
down into pieces that can be thought of independently. Once the program has
been completed, we can think of its execution as being a series of these
pieces that work together in a certain sequence. These pieces then pass the
control of the program between each other. While one piece has the control,
the other pieces are inactive. This is known as the flow of control in a
program.
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