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This would tell the computer to substitute 100 each time it processes yourName a variable that recognizes instances of your actual name. Back to Xcode now, and our topic. In this context, the IBOutlet and IBAction quasikeywords aren t really defined to be anything. In other words, they don t do anything substantial for the compiler, which is the core of the computer. Quasi-keywords are flags, though, and they are important in the communication with the Interface Builder. When it sees the IBOutlet and IBAction quasi-keywords, it gets some of its internal code ready to perform specific tasks. It gets itself ready to deal with instance variables and all the hooks and connections that we make in that programming arena.
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More About Pointers
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It s difficult for many programming students to understand the concept of pointers also sometimes known as the concept of indirection. It s not easy to explain this idea because it s one of the most sophisticated features of the C programming language. Earlier in this chapter, I presented the analogy of seeing a criminal doing something, and then calling the police and pointing the police to where he is so they, not you, can arrest the criminal. This analogy works for many students, but now let s go a little deeper. If you were to ask a Computer Science professor what a pointer is, he would probably say something like Pointers hold the address of a variable or a method. The address you ask. Well, consider this new analogy in the way of explanation. Have you ever seen a movie in which a detective or some frantic couple is traveling all over the place, looking for clues to the treasure map, or the missing painting, or the kidnapped daughter Sometimes they will spot a fingerprint, or a receipt, or even an envelope with a piece of paper containing a cryptic message and these take the people one step closer to their goal of finding the missing objects themselves.
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CHAPTER 5: Buttons & Labels with Multiple Graphics
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We can call these pointers; they indicate the next place to go for the solution of the given problem. They don t necessarily give the ultimate address, at which everything is handled and resolved, but they give us intermediate addresses or places to continue our work. Thus, what the professor of Computer Science means is that pointers do not actually contain the items to which they direct us; they contain the locations within the code the addresses of the desired objects or actions or entities. This important feature makes the C-family of languages very powerful. This simple idea makes it very efficient to turn complex tasks into easy ones. Pointers can pass values to types and arguments to functions, represent huge masses of numbers, and manipulate how we manage memory in a computer. Many of you are perhaps thinking that pointers are similar to variables in the world of algebra. Exactly! In our first analogy, a pointer enabled an unarmed citizen to arrest a dangerous criminal by using indirection that is, by calling the police to come and solve the problem. (Yes, the term indirection is an odd choice given that we are actually being directed toward the goal.) Consider the following example where we use a pointer to direct us to the amount you have in your bank balance. To do this, let s define a variable called bankBalance as follows:
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int bankBalance = $1,000;
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Now, let s throw another variable into the mix and call it int_pointer. This will allow us to use indirection to indirectly connect to the value of bankBalance by the declaration:
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int *int_pointer;
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The star, or asterisk, tells the family of C-languages that our variable int_pointer is allowed to indirectly access the integer value of the amount of money in our variable (placeholder): bankBalance. To close, I want to remind you, and to acknowledge, that our digging around here is not an exhaustive or rigorous exploration into these topics just a fun tangent into some related ideas. At this point, there is no reason for you to be bothered if you don t fully understand pointers. Seeds have been planted and that s what counts for now!
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