Arrays in C programming Language

Arrays

Arrays of any type can be formed in C. The syntax is simple:

 type name[dim];

In C, arrays starts at position 0. The elements of the array occupy adjacent locations in memory. C treats the name of the array as if it were a pointer to the first element--this is important in understanding how to do arithmetic with arrays. Thus, if v is an array, *v is the same thing as v[0], *(v+1) is the same thing as v[1], and so on:

Pointer use for an array

Consider the following code, which illustrates the use of pointers:

#define SIZE 3

void main()
{
float x[SIZE];
float *fp;
int   i;
  /* initialize the array x         */
  /* use a "cast" to force i        */
  /* into the equivalent float      */
for (i = 0; i < i =" 0;" fp =" x;" i =" 0;">

(The expression ``i++'' is C shorthand for ``i = i + 1''.) Since x[i] means the i-th element of the array x, and fp = x points to the start of the x array, then *(fp+i) is the content of the memory address i locations beyond fp, that is, x[i].

1. A First Program

2. Let's Compute

3. Loops

4. Symbolic Constants

5. Conditionals

6. Pointers

7. Arrays

8. Character Arrays

9. I/O Capabilities

10. Functions

11. Command-line Arguments

12. Graphical Interfaces: Dialog Boxes