By A. D. Marshall
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Additional info for Programming in C UNIX System Calls and Subroutines using C
E. &a[i] a + i. We also express pointer addressing like this: pa[i] *(pa + i). However pointers and arrays are different: A pointer is a variable. We can do pa = a and pa++. An Array is not a variable. a = pa and a++ ARE ILLEGAL. This stuff is very important. Make sure you understand it. We will see a lot more of this. We can now understand how arrays are passed to functions. When an array is passed to a function what is actually passed is its initial elements location in memory. So: strlen(s) strlen(&s) This is why we declare the function: int strlen(char s); An equivalent declaration is : int strlen(char *s); char *s.
Blank spaces delimit end of arguments. Put blanks in `` '' if needed. Pointers to a Function Pointer to a function are perhaps on of the more confusing uses of pointers in C. Pointers to functions are not as common as other pointer uses. However, one common use is in a passing pointers to a function as a parameter in a function call. (Yes this is getting confusing, hold on to your hats for a moment). This is especially useful when alternative functions maybe used to perform similar tasks on data.
F3, a 4 bit type and a 9 bit funny_int. C automatically packs the above bit fields as compactly as possible, provided that the maximum length of the field is less than or equal to the integer word length of the computer. If this is not the case then some compilers may allow memory overlap for the fields whilst other would store the next field in the next word (see comments on bit fiels portability below). type = 7; NOTE: Only n lower bits will be assigned to an n bit number. So type cannot take values larger than 15 (4 bits long).