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3-Variables - Libraries Contain programs written by others...

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Libraries Contain programs written by others, that your program can use… std:: #include < > What’s the difference? Where the actual code is kept.
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Using the std:: library std::cout << “hello”; displays the string hello std::cout << x; displays the value of x std::cout << x << std::endl; skips to the next line after printing x std::cin >> x; // note >> takes keyboard input and sets the value of x
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How do we use numbers? Counting Measuring Non-numerical designations: Finally, they can designate a “state” unrelated to the number (“1 if by land, 2 if by sea”)
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So computers Must deal with each type of number in it’s own way Must store those numbers in their own way Must make those numbers available, though, through a common interface That interface, is the “VARIABLE”
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Variables x, y, z i, j, k TotalCountOfNewEmployees Geekish_Designations_0123 They Stand for Something, can be named anything but reserved C++ words
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Variable Types (primitive, common) Integers – meant to be a whole number (used for counting) C++: int Floating Pt. – meant to be a detailed number
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