By George David Birkhoff, Ralph Beatley
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To make the pointer point to a long, use the & operator. The unary & operator returns the address of its operand: myLongPtr = &myLong; To retrieve a value from a pointer, use the * operator. The * operator takes an address and returns the value at that address: myLong = *myLongPtr; Remembering C 35 As mentioned earlier, the -> operator can be used with a pointer to a struct to access one of the struct’s fields. The * and . operators can be used in the same way. myField Pointers are frequently used to step through an array.
The remaining arguments (if there are any) are determined by the format string. Preprocessor Directives Traditional C compilers compile your program in two passes. The first of these two passes is known as the preprocessor pass. There are a number of commands that you can place in your code to instruct the compiler to take a special action during this pass. These commands are known as preprocessor directives and always start with the pound sign (#). Two widely used preprocessor directives are #define and #include.
Remembering C 43 The classic example of ellipsis use is in the declaration of printf(): int printf( char *format, ... ); The first parameter is a text string containing the format specification. The remaining arguments (if there are any) are determined by the format string. Preprocessor Directives Traditional C compilers compile your program in two passes. The first of these two passes is known as the preprocessor pass. There are a number of commands that you can place in your code to instruct the compiler to take a special action during this pass.
Basic geometry: Manual for teachers by George David Birkhoff, Ralph Beatley