By Paul L. Anderson, Gail C. Anderson
This certain paintings appears to be like on the portability, execution potency and programming program innovations of the complicated interval. Examples are given of ways complex C functions might be moved shape procedure to method.
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Additional info for Advanced C: Tips and Techniques (Hayden Books C Library)
C to swap floats without a temporary variable. This is not as easy as it looks, since C doesn't allow Exclusive-OR's between floats. What restrictions, if any, would this new function have and how portable is the code? 7. Modify the SWAP macro so that it doesn't use a temporary variable. What is the disadvantage here? 8. Compile and run the following program on your machine. buf); Can you explaintheoutput? 9. The followingprogram uses a stack and two functionsnamed push () and pop () toreversecharacters ina string.
A [i] . . Inside the block, the program declares i as a register variable before it loops through the array. If a register is available, the loop executes faster. It's often a good idea to declare the most important register variables first when declaring multiple register variables of the same type. With this approach, the least important ones become autos if the compiler cannot provide a register. A good application for this technique is with multidimensional array subscripts. The following code, for example, loops through all the elements of a two dimensional array of integers named b.
We examine program variables in the context of their run time environment; that is, where and when storage allocation occurs, and what choices you have for specifying storage classes. Although your program's environment is often machine dependent, it still makes sense to understand C's run time philosophy. This helps you design programs that run faster and require less memory. • Program Areas • We've mentioned the importance of understanding the run time environment. This is where the declarations in your program are put into action.
Advanced C: Tips and Techniques (Hayden Books C Library) by Paul L. Anderson, Gail C. Anderson