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One Dimensional Array

 One Dimensional Array
Let us consider A is a one dimensional array which have four elements like:
A(1) A(2), A(3), A(4)
these are stored in the computer and their values will be as:
A(1) A(2) A(3) A4)
2 8 3 6
This is an example of an array which contains integer numbers:
Assume that the index (or subscript) starts at 1 then:
· the first element of the array is 2 with an index of 1
· the second element of the array is 8 with an index of 2
· the third element of the array is 3 with an index of 3
· the last element of the array is 6 with an index of 4.
· one-dimensional array is the simplest array, which is just a sequence of elements stored   consecutively in the memory of computer.
the declaration is:
real A(20)
declares A as a real array of length 20 which means A consists of 20 real numbers stored contiguously in memory. Here the first number in the array is denoted by A(1) and the last by A(20).
However, you may define an arbitrary index range for your arrays using the following syntax:
real b(0:19), weird(-162:237)
Here, b is a real array & the index runs from 0 through 19, while weird is an array of length 237-(-162)+1 = 400.
The type of an array element can be any of the basic data types.
integer i(10)
logical aa(0:1)
double precision x(100)
Each element of an array can be thought of as a separate variable.
An array with a rank of one is called a vector.
Program of one dimensional array showing addition of array and displaying the array.