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The key fact about asserts is that they are only used in the debug version of a program. When you switch the compiler into “release mode” the assert functions are filtered out. ” To conclude, let us look at a complete, albeit simple, program that uses asserts. 2: Using assert. = 0 ); // Check for null array. assert( size >= 1 ); // Check for a size >= 0. , it is not null) 2) The array has a size of at least one element. Both of these assumptions are asserted in code: // Check for null array. = 0 ); // Check for a size >= 0.
31 Chapter 12 Number Systems; Data Representation; Bit Operations 33 Introduction For the most part, with the closing of the last chapter, we have concluded covering the core C++ topics. As far as C++ is concerned, all we have left is a tour of some additional elements of the standard library, and in particular, the STL (standard template library). , we will look at the individual bits that make up these types. Chapter Objectives • Learn how to represent numbers with the binary and hexadecimal numbering systems, how to perform basic arithmetic in these numbering systems, and how to convert between these numbering systems as well as the base ten numbering system.
That is, an on bit (1) becomes on off bit (0), and conversely, an off bit (0) becomes an on bit (1). The bitwise NOT operator is a unary operator and its symbol is the tilde (~). Here is an example: unsigned char A = 0xB9; unsigned char C = ~A; // NOT the bits in A and store the result in C. To see what is happening, let us look at the binary: A = 1011 1001 ~ 1011 1001 ----------C = 0100 0110 As you can see, the bitwise NOT operator, or complement operator, simply negates each bit. That is, an on bit (1) becomes on off bit (0), and conversely, an off bit (0) becomes an on bit (1).