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Random in Pascal: Examples

Random in Pascal

Also in Pascal they use randomize, often this happens in conjunction with random. Since separately the randomize option will give the same number at all times. This process allows us to initialize the sensor.

The for loop is appropriate to use when you are filling an array. Since we already know how many elements it has. The index of the items can be a cycle counter.

In Pascal, two types of arrays are generally used: one-dimensional and two-dimensional. One-dimensional arrays, which will be discussed, carry information about different elements that will be related to the same data type. Random Pascal is necessary so that you do not have to constantly set a value to the array.

The pseudorandom number generator does not give us the opportunity to follow the algorithm by which numbers are selected. This is extremely important, because if there was any pattern here, the work of the program would not be performed quite correctly. The numbers do not depend on each other, and we will not be able to predict the result that such an option will give us.

Operation of the random number generator


In order for the random to work in Pascal, the programmer needs to set a gap of numbers that will be relevant when he works. Before you start running the program, you must describe the random function to the program. Random and randomize in Pascal always work together, as mentioned above in the article. Randomize is inserted into the description immediately after begin, doing this in order to simplify the readability of codes.

Now let's go straight to the most interesting and figure out how to run a random number generator in Pascal. Examples of prescribed programs can be viewed on the Internet and practice on tasks. You need to be careful and do not forget to describe randomize to generate a truly random number.

A simple example:

n, i, x: integer;
n := random (7) + 5;
for i := 1 to n do
x := random (100) — 50;
write (x:5) end;

Otherwise, just from the random function, the number obtained as a result will not be accidental at all. Often, beginners prescribe the randomize command with each insertion of random, and this is a gross error.

It is necessary to set this option 1 time at the very beginning of writing the program.

Sorting is performed with one-dimensional arrays. There are three ways to do this. Let's consider each in detail.


  • It works on the principle that the array is water, and its elements are bubbles. The lighter the element, the faster it rises to the surface.
  • Paired elements of approximately the same size are compared with each other. The one that makes more of a substitution over a teammate.
  • This happens in the work of the whole cycle, until its end.

The selection method is as follows:

  • Elements are built on the principle from more to less.
  • Next, the minimum element becomes in second place after the largest.
  • This continues with the remaining elements.

The last way is quick sorting:

  • Find the middle element of the array;
  • Add to L and find the first element (it should be larger).
  • Make R smaller and find the last element (it should be smaller).
  • If paragraph 2 is less than or equal to paragraph 3, we reverse their order.

Completing random work in Pascal

In the Pascal program, there is such a concept of a Fibonacci number, it implies a series of sequences of digits, according to the principle, the next number consists of the sum of two numbers in front of it. The fibonacci formula must be applied in the for loop, at the very beginning, when we prescribe the elements of the array.

Random in Pascal

The random function helps us generate a series of numbers ranging from 0 to 1. In order to set your range, you need to write these digit values in parentheses, immediately after 0. Without this option, you probably will not be able to generate a number randomly, and similarly each subsequent one. Therefore, the Pascal program cannot work without the ability to generate unplanned numbers.

Declaring an array carries some syntax. This helps determine the number of elements in the array. For a multidimensional array, only the initial dimension can be used.

You can get a multidimensional array by using a specific sequence of constant expressions that are specified in square brackets in the program.

In order to work with pascal, you need to understand the meaning and principle of random. At first glance, it's easy enough to learn. But since random numbers are very important, you need to be careful not to make a mistake in writing the program. Generating numbers is very exciting and unpredictable, in a properly written program you will never be able to predict the result.