PseudoCode

JD Says: Pseudocode is a kind of structured english for describing algorithms. It allows the designer to focus on the logic of the algorithm without being distracted by details of language syntax. At the same time, the pseudocode needs to be complete. It describe the entire logic of the algorithm so that implementation becomes a rote mechanical task of translating line by line into source code.
Here we go, A simple PseudoCode Reader, parser and compiler! We can develop this and after testing it get it's real source code in many different programming languages specially C and Java, Yay!

You can download the jar file from here and test it right now!
Note: Don't forget to enter exit at the end of your PseudoCode.

java -jar AXPseudoCode.jar

Enter your PseudoCode here and enter exit at the end...
--------------------------------------------------------
print "Enter 5 integers to get the average"
read x[5]
sum = sum(x)
print "Sum = " sum ", Average = " sum / x.length
exit
----------------
Wait a moment...
----------------
----------------
Let's start :)
----------------
Enter 5 integers to get the average
1 2 3 4 5
Sum = 15, Average = 3
----------------
DONE
----------------

IF

Binary choice on a given Boolean condition is indicated by the use of four keywords: IF, THEN, ELSE, and ENDIF. The general form is:

print "Enter an integer"
read n
IF n > 0
   print "+"
ELSE IF n < 0
   print "-"
ELSE
   print "0"

Opening/Closing statement (by Then, EndIf or {}) isn't necessary.

WHILE

The WHILE construct is used to specify a loop with a test at the top. The beginning and ending of the loop are indicated by two keywords WHILE and ENDWHILE. The general form is:

SET i to 0
WHILE i < 10
   i++
   print i

Opening/Closing statement (by ENDWHILE or {}) isn't necessary.

REPEAT-UNTIL

This loop is similar to the WHILE loop except that the test is performed at the bottom of the loop instead of at the top. Two keywords, REPEAT and UNTIL are used. The general form is:

sum = 0
n = 0
REPEAT
   print "Enter an integer"
   read n
   sum += n
UNTIL n != 0
print "SUM = " & sum

You can also use DO, WHILE instead of REPEAT, UNTIL.

FOR

This loop is a specialized construct for iterating a specific number of times, often called a "counting" loop. Two keywords, FOR and ENDFOR are used. The general forms are:

FOR i = 0 to 10
   print i
   
FOR i = 10 to 0 step -1
   print i
   
FOR i in range(10, 20)
   print i
   
x = [5, 4, 3, 2, 1]
FOR EACH i on x
   print i * 2

Opening/Closing statement (by ENDFOR or {}) isn't necessary.

TYPES

Supports %s, %d, %f, %b, %c, ... or just write it's type like BOOL or boolean, String, integer or int, double, ...

print "Enter your name and age : "
read %s:name, %d:age
print "Hello " name ", Your Age is " age

DEFAULTS

SET a to 24
SUBTRACT 10 from a 
ADD 15 to a
print a
// a = 29

SAMPLES

An algorithm to reverse array, for example [1, 2, 3, 4, 5] to [5, 4, 3, 2, 1]

print “Please enter 5 integers”
read x[5]

reverse(x, 0, x.length - 1)
print x

Algorithm swap(x[], j, i)

temp = x[j]
x[j] = x[i]
x[i] = temp

Algorithm reverse(A[], start, end)

if (start >= end)
 return
else
 swap(A, start, end)
 reverse(A, start + 1, end - 1)

An algorithm to sum digits of a number, for example 123 => 1 + 2 + 3

print “Please enter a positive integer”
read m
n = m
sum = 0
r = 0
while (n != 0)
  r = n mod 10
  sum = sum + r
  n = n / 10
print “sum of digits of ” m “ = “ sum

An algorithm to get gcd of n numbers

print "Enter the number of integers"
read n
print "Enter " n " integers"
read x[n]
print "GCD = " GCD(x)

Author

Amir Hossein Aghajari

License

Copyright 2021 Amir Hossein Aghajari
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Amir Hossein Aghajari • Email • GitHub

Aghajari / PseudoCode