What is an Array?

 

An Arrays a data structure that has a fixed number of contiguous storage of all the same data types Arrays are also referred to as matrices or a matrix.  Arrays can also be multidimensional, and have numerous elements.

To find a position in an array we need to know the base address and the number of the offset, or index. The elements in the array are taking up a contiguous piece of memory so the elements are sequential and take up two bytes each. 

 

 

Questions:

1.- How can we create an array?

 

You use a new operator, plus the data type of the array elements, plus the number of elements desired enclosed within square brackets. The next statement in the sample program allocates an array with enough memory for ten integer elements and assigns the array to the variable an Array declared earlier. int prime[10]={1,5,7,9,11,13,15,17,19,21,};h

 

2.- How can we access elements in an array?

 

The memory has been allocated for the array at runtime, the program assigns values to the arrays elements. The code shows the reference an array element, either to assign a value to it, or to access the value, and the square brackets to the array name. The value between the square brackets indicates the index of the element to access.

 

3.- How can we know the size of an array?

 

To get the size of an array, you write arrayname.length in the program

 

4.- How we declare an array in the code?                                       Answer: e

a) int [] an array;

b) like variable

c) array type

d) array name

e) all the above

5.- How many bytes needs a contiguously in an array?                       Answer: a

a)2 bytes

b)4 bytes

c)8 bits

d)32 bits

 

References:

    www.Java.sun.com

    pweb.netcom.com/~tjensen/ptr/pointers.htm

     Textbook on the webpage of www.pkirs.utep.edu/cis3355