C2007-09-22
Command-line Arguments in C
In environments that support C, there is a way to pass command-line arguments or parameters to a program when it begins executing. When main is called, it is called with two argume
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C2007-09-22
Pointers vs. Multi-dimensional Arrays in C
Newcomers to C are sometimes confused about the difference between a two-dimensional array and an array of pointers. int a[10][20]; vs int *b[10];
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Initialization of Pointer Arrays in C
Consider the problem of writing a function month_name(n), which returns a pointer to a character string containing the name of the n-th month. This is an ideal application for an i
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Multi-dimensional Arrays in C (Explained using date conversion program)
C provides rectangular multi-dimensional arrays, although in practice they are much less used than arrays of pointers. In this section, we will show some of their properties.
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Pointer Arrays and Pointers to Pointers in C
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
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Character Pointers and Functions in C
A 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
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C2007-09-22
Address Arithmetic and pointers in C
If 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
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Pointers and Arrays in C
In 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
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Pointers and Function Arguments in C
Since 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
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#if, #elif, #ifndef, #ifdef in C (Conditional Inclusion)
It 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
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Macro Substitution using #define in C
A definition has the form #define name replacement text
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File Inclusion in C
File inclusion makes it easy to handle collections of #defines and declarations (among other things). Any source line of the form #include "filename"
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