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W15-Struct_Func2 - Functions 2 1 Program Design Top-down...

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10/24/05 1 Functions 2 10/24/05 2 Program Design Top-down design (or step-wise refinement) Start with total problem and break into sub- problems, then into sub-sub-problems, etc. Make functions for each sub-problem. main() solves whole by calling f1(), f2(), f3(). f1() solves sub-problem by calling f4(), f5(), etc. 10/24/05 3 C Program Structure main fcn1 fcn2 fcn3 fcn4 fcn5 fcn6 calls calls calls
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10/24/05 4 Extended In-Class Example Simple Animation Algorithm 1) Draw a figure on the screen at (x, y). 2) Pause a bit. 3) Erase the figure. 4) Change x and/or y a small amount. 5) Check for screen boundries. 6) Repeat from step 1) 10/24/05 5 conio.h Library _gotoxy(int x, int y) – positions console screen cursor at column x, row y. _textcolor(int color) – sets the text foreground color for future screen writes.
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