THE TUTORIAL LIBRARY
Since pointers are variables themselves, they can be stored in arrays just as other variables can. Let us illustrate by writing a program that will sort a set of text lines into al
Read tutorialA string constant, written as "I am a string" is an array of characters. In the internal representation, the array is terminated with the null character '\0' so that programs can f
Read tutorialIf p is a pointer to some element of an array, then p++ increments p to point to the next element, and p+=i increments it to point i elements beyond where it currently does. These
Read tutorialIn C, there is a strong relationship between pointers and arrays, strong enough that pointers and arrays should be discussed simultaneously. Any operation that can be achieved by a
Read tutorialSince C passes arguments to functions by value, there is no direct way for the called function to alter a variable in the calling function. For instance, a sorting routine might ex
Read tutorialIt is possible to control preprocessing itself with conditional statements that are evaluated during preprocessing. This provides a way to include code selectively, depending on th
Read tutorialA definition has the form #define name replacement text
Read tutorialFile inclusion makes it easy to handle collections of #defines and declarations (among other things). Any source line of the form #include "filename"
Read tutorialC functions may be used recursively; that is, a function may call itself either directly or indirectly. Consider printing a number as a character string. As we mentioned before, th
Read tutorialIn the absence of explicit initialization, external and static variables are guaranteed to be initialized to zero; automatic and register variables have undefined (i.e., garbage) i
Read tutorialA register declaration advises the compiler that the variable in question will be heavily used. The idea is that register variables are to be placed in machine registers, which may
Read tutorialThe variables sp and val in stack.c, and buf and bufp in getch.c, are for the private use of the functions in their respective source files, and are not meant to be accessed by any
Read tutorialOne example today. A better developer tomorrow.