By Jeff Kent
Minimum technical jargon, step by step discussions, and quizzes on the finish of every bankruptcy make this an easy-to-understand consultant to C++ programming. fast examine what a programming language is and the anatomy of C++, then leap correct into developing your personal courses with specialist counsel. detect capabilities, items, compilers, linkers, and lots more and plenty extra alongside the best way. For the quick and straightforward option to realizing the basics of C++, this can be the source you wish.
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Extra resources for C++ Demystified: A Self Teaching Guide
Figure 2-3: Storage in memory of 65365 in decimal as an unsigned short data type The int data type requires 4 bytes of storage. Figure 2-4 shows how 65365 in decimal would be stored as an unsigned int data type. Figure 2-4: Storage in memory of 65365 in decimal as an unsigned int data type You may legitimately wonder why 65365 in decimal as an unsigned int data type requires four bytes of storage when 65365 in decimal as an unsigned short data type requires only two bytes of storage. In other words, if you specify int instead of short as the data type, four bytes of storage will be reserved, even if you could store the number in less bytes.
The float data types can store very large numbers, such as (in decimal) 10000000000000000000000000000000000000, which could be a distance across the universe. 00000000000000000000000000000000000001, which could be the diameter of a subatomic particle. Rather than having digits running across the page, the number can be expressed more compactly. One way is with scientific notation, another is with E notation. Table 2-4 shows how certain floating-point numbers are represented in both notations. 2E9 In scientific notation, the number before the multiplication operator, called the mantissa, always is expressed as having a single digit to the left of the decimal point, and as many digits as necessary to the right side of the decimal point to express the number.
In other words, if you specify int instead of short as the data type, four bytes of storage will be reserved, even if you could store the number in less bytes. The reason is that it is not known, when memory is reserved, what value will be stored there. Additionally, the value could change. Accordingly, enough bytes of storage are reserved for the maximum possible value of that data type. Why Use a Smaller Size Data Type? Given that an int can store a far wider range of numbers than a short, you also may be wondering why you ever would use a short rather than an int.