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69.	What is a program flowchart?
	A flowchart provides a visual representation of the step by step procedure towards solving a given problem. Flowcharts are made of symbols, with each symbol in the form of different shapes. Each shape may represent a particular entity within the entire program structure, such as a process, a condition, or even an input/output phase.
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70.	What are the advantages and disadvantages of a heap?
	Storing data on the heap is slower than it would take when using the stack. However, the main advantage of using the heap is its flexibility. That's because memory in this structure can be allocated and remove in any particular order. Slowness in the heap can be compensated if an algorithm was well designed and implemented.
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71.	Is it possible to create your own header files?
	Yes, it is possible to create a customized header file. Just include in it the function prototypes that you want to use in your program, and use the #include directive followed by the name of your header file.
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72.	What is the use of "# define" in C?
	#define is a pre-processor directive which is used to define constant value. This constant can be any of the basic data types.
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