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Recall that you can double-click the source code file name to open a new editing window, or you can click the Editor toolbar icon to open an editing pane within the project window.
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Figure 5-6. The operator project window (note that the window has been rearranged a bit to show all of main.c)
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CHAPTER 5: C Basics: Variables and Operators
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Run operator by selecting Build and Run from the Build menu. Xcode will compile main.c, and then link and run the program. Compare your output to that shown in Figure 5-7. They should be about the same.
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Figure 5-7. This picture of the console window shows the output from running our operator project.
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Stepping Through the operator Source Code
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Let s take a look at the operator project s source code. In Xcode, bring main.c in an editing window. main.c starts off with our usual #include of stdio.h. This gives us access to printf().
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#include <stdio.h> main() starts out by defining an int named myInt: int main (int argc, const char * argv[]) { int myInt;
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Earlier I used the phrase declaring a variable and now I m using the term defining. What s the difference A variable declaration is any statement that specifies a variable s name and type. The line int myInt; certainly does that. A variable definition is a declaration that causes memory to be allocated for the variable. Since the previous statement does cause memory to be allocated for myInt, it does qualify as a definition. Later in the book, you ll see some declarations that don t qualify as definitions. For now, just remember, a variable definition causes memory to be allocated.
CHAPTER 5: C Basics: Variables and Operators
At this point in the program (after myInt has been declared but before any value has been assigned to it), myInt is said to be uninitialized. In computerese, initialization refers to the process of establishing a variable s value for the first time. A variable that has been declared, but that has not had a value assigned to it, is said to be uninitialized. You initialize a variable the first time you assign a value to it. Since myInt was declared to be of type int, and since Xcode is currently set to use 4-byte
ints, 4 bytes of memory were reserved for myInt. Since we haven t placed a value in those
4 bytes yet, they could contain any value at all. Some compilers place a value of 0 in a newly allocated variable, but others do not. The key is not to depend on a variable being preset to some specific value. If you want a variable to contain a specific value, assign the value to the variable yourself!
NOTE
In 7, you ll learn about global variables. Global variables are always set to 0 by the compiler. All the variables used in this chapter are local variables, not global variables. Local variables are not guaranteed to be initialized by the compiler.
The next line of code uses the * operator to assign a value of 6 to myInt. Following that, we use printf() to display the value of myInt in the console window.
myInt = 3 * 2; printf( "myInt ---> %d\n", myInt );
The code between printf() s left and right parentheses is known as an argument list. The arguments in an argument list are automatically provided to the function you are calling (in this case, printf()). The receiving function can use the arguments passed to it to determine its next course of action. Interestingly, when you define or declare a function, the elements between the parentheses that correspond to the argument list are known as parameters. You ll learn more about parameters in 7. For the moment, let s talk about printf() and the arguments used by this Standard Library function. The first argument passed to printf() defines what will be drawn in the console window. The simplest call to printf() uses a quoted text string as its only argument. A quoted text string consists of a pair of double-quote characters (") with zero or more characters between them. For example, this call of printf():
printf( "Hello!" );
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