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Pseudocode Examples

2 years ago
2 Comments
by Mike
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What is Pseudocode

Pseudocode is a compact and informal high-level description of a program using the conventions of a programming language, but intended more for humans.

Pseudocode is not an actual programming language. So it cannot be compiled into an executable program. It uses short terms or simple English language syntaxes to write code for programs before it is actually converted into a specific programming language.

And there is no pseudocode standard syntax and so at times it becomes slightly confusing when writing Pseudocode and so let us understand pseudo code with an example.

  • INPUT – indicates a user will be inputting something
  • OUTPUT – indicates that an output will appear on the screen
  • WHILE – a loop (iteration that has a condition at the beginning)
  • FOR – a counting loop (iteration)
  • REPEAT – UNTIL – a loop (iteration) that has a condition at the end
  • IF – THEN – ELSE – a decision (selection) in which a choice is made
  • any instructions that occur inside a selection or iteration are usually indented

 

Some Keywords That Should be Used

For looping and selection, The keywords that are to be used include Do While…EndDo; Do Until…Enddo; Case…EndCase; If…Endif; Call … with (parameters); Call; Return ….; Return; When; Always use scope terminators for loops and iteration.As verbs, use the words Generate, Compute, Process, etc. Words such as set, reset, increment, compute, calculate, add, sum, multiply, … print, display, input, output, edit, test , etc. with careful indentation tend to foster desirable pseudocode.

Do not include data declarations in your pseudocode.

Pseudocode Examples ( Algorithms Examples in Pseudocode )

There are 18 pseudocode tutorial in this post. The Pseudocode examples  go from beginner to advanced. You will find a lot of for loop, if else and basics examples. Pseudocode and flowchart examples are in following the post.

 

Pseudocode Example 1: Add Two Numbers.(Simple Pseudocode  Example)

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BEGIN
NUMBER s1, s2, sum
OUTPUT("Input number1:")
INPUT s1
OUTPUT("Input number2:")
INPUT s2
sum=s1+s2
OUTPUT sum
END
 

 

Flowchart of Pseudocode

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Pseudocode Example 2: Calculate Area and Perimeter of Rectangle (Simple Pseudocode  Example)

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BEGIN
NUMBER b1,b2,area,perimeter
INPUT b1
UNPUT b2
area=b1*b2
perimeter=2*(b1+b2)
OUTPUT alan
OUTPUT perimeter
END
 

 

Flowchart of Pseudocode

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Pseudocode Example 3: Find Area and Perimeter of a Square (Simple Pseudocode Example)

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BEGIN
NUMBER len, area,perimeter
INPUT len
area = len*len
perimeter = len*4
OUTPUT area
OUTPUT perimeter
END
 

Pseudocode Example 4: Find Area Of Circle using Radius (Simple Pseudocode  Example)

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BEGIN
NUMBER r, area
INPUT r
area=3.14*r*r
OUTPUT area
END
 

Flowchart of Pseudocode

 

Pseudocode Example 5: Find Perimeter Of Circle using Radius (Simple Pseudocode  Example)

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BEGIN
NUMBER r, perimeter
INPUT r
perimeter=2*3.14*r
OUTPUT perimeter
END
 

Flowchart of Pseudocode

 

Pseudocode Example 6: Calculate sales taxes (Simple Pseudocode  Example)

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BEGIN
NUMBER price, tax, taxRate, total
 
OUTPUT "Enter Product Price"
INPUT price
OUTPUT "Enter tax rate amoung 1 and 100"
OKU taxRate
 
tax= price* taxRate/100
total= price + tax
 
OUTPUT "Product tax="+tax
OUTPUT "Product total price ="+total
 
END
 

 

Flowchart of Pseudocode

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Pseudocode Example 7:  Solve Quadratic Equation (Pseudocode If Else Example)

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BEGIN
NUMBER a, b, c, d, x1, x2
INPUT a,b,c
d = b^2-4ac
IF (d >= 0) THEN
      x1 = (-b+√d)/2a yada x1 = (-b+d^(1/2)/2a
      x2 = (-b-√d)/2a yada x2 = (-b-d^(1/2)/2a
      OUTPUT "ROOT 1:"+x1
      OUTPUT "ROOT 2:"+x2
ELSE IF (d == 0) THEN
      x1=x2= -b/2a
      OUTPUT "ROOT 1:"+x1
      OUTPUT "ROOT 2:"+x2
ELSE
    OUTPUT "There is no real root"
ENDIF
END
 

Flowchart of Pseudocode

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Pseudocode Example 8: issue for driver licence (Pseudocode If Else Example)

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BEGIN
NUMBER age
 
INPUT "Enter your age for driving licence"
OUTPUT age
 
IF age>=16  THEN
     OUTPUT "You can take driving licence"
ELSE
   OUTPUT "You can't take driving licence"
ENDIF
END
 

Flowchart of Pseudocode

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Pseudocode Example 9: Check a Number is Positive or Negative (Pseudocode If Else Example)

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BEGIN
 
NUMBER num
 
OUTPUT "Enter a Number"
OKU num
IF num>0  THEN
     OUTPUT "Entered number is positive"
ELSE IF num <0 THEN
     OUTPUT "Entered number is negative"
ELSE
     OUTPUT "Entered number is zero"
ENDIF
 
END
 

Flowchart of Pseudocode

flowchart examples, flowchart examples for student, flowchart examples for programming

Pseudocode Example 10: Find the biggest of three (3) Numbers (Pseudocode If Else Example)

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BEGIN
NUMBER num1,num2,num3
INPUT num1
INPUT num2
INPUT num3
IF num1>num2 AND num1>num3  THEN
     OUTPUT num1+ "is higher"
ELSE IF num2 > num3 THEN
     OUTPUT num2 + "is higher"
ELSE
     OUTPUT num3+ "is higher"
ENDIF
END
 

Flowchart of Pseudocode

flowchart examples, flowchart examples for student, flowchart examples for programming

 

 

Pseudocode Example 11: Print Numbers from 1 to 100. (Pseudocode For Loop Example)

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BEGIN
NUMBER counter
 
FOR  counter = 1 TO  100 STEP 1 DO
     OUTPUT counter
ENDFOR
 
END
 

Flowchart of Pseudocode

 

 

Pseudocode Example 12: Find Sum of Natural Numbers (1 to 100). (Pseudocode For Loop Example)

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BEGIN
NUMBER counter, sum=0
FOR counter=1 TO 100 STEP 1 DO
     sum=sum+counter
ENDFOR
OUTPUT sum
END
 

Pseudocode Example 13: Read 50 numbers and find their sum and average. (Pseudocode For Loop Example)

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BEGIN
NUMBER counter, sum=0, num
FOR counter=1 TO 50 STEP counter DO
     OUTPUT "Enter a Number"
     INPUT num
     sum=sum+num
ENDFOR
 
OUTPUT sum
END
 

Flowchart of Pseudocode

flowchart examples, flowchart examples for student, flowchart examples for programming

 

 

Pseudocode Example 14: Read 10 numbers and find sum of even numbers. (Pseudocode For Loop Example)

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BEGIN
NUMBER counter, sum=0, num
FOR counter=1 TO 10 STEP 1 DO
     OUTPUT "Enter a Number"
     INPUT num
     IF num % 2 == 0 THEN
           sum=sum+num
     ENDIF
ENDFOR
OUTPUT sum
 
END
 

Flowchart of Pseudocode

 

Pseudocode Example 15: Find the sum of all elements of array. (Pseudocode For Loop Example)

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BEGIN
NUMBER i=0, n=5, sum=0
ARRAY numbers={65,45,10,7,125}
FOR i=0 TO n-1 STEP 1 DO
   sum = sum + numbers[i]
ENDFOR
 
OUTPUT  "Sum of numbers in the array"+sum
 
END
 

Flowchart of Pseudocode

 

 

Pseudocode Example 16: Calculate square of a number (Simple Pseudocode  Example)

 

Alternative 1:

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BEGIN
NUMBER num, result
OUTPUT "Enter a number for calculate the power of the number"
INPUT num
 
result=num*num
OUTPUT "Power of the Number:" + result
 
END
 

 

Alternative 2:

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BEGIN
NUMBER num, result=0,counter
 
OUTPUT "Enter a number for calculate the power of the number"
INPUT num
FOR counter=0 TO num-1 STEP 1 DO
     result +=num
ENDFOR
OUTPUT "Power of the Number:" + result
 
END
 

 

 

Pseudocode Example 17: Calculate the Square Root of a Number (Pseudocode For Loop Example)

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BEGIN
 
NUMBER root=1, counter=0,num
OUTPUT "Enter a number for calculate the root"
INPUT num
WHILE sayac < sayi+1 THEN
   i=i+1
   root=(num/root+root)/2
END WHILE
OUTPUT root
END
 

 

 

flowchart examples, flowchart examples for student, flowchart examples for programming

 

Pseudocode Example 18: Swap two variables with using a temporary variable (Simple Pseudocode  Example)

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BEGIN
NUMBER a,b,c
a=10, b=20
OUTPUT "Value of a :"+a
OUTPUT "Value of b :"+b
c=a
a=b
b=c
OUTPUT "Value of a :"+a
OUTPUT "Value of b :"+b
END
 

 

Pseudocode Example 19: Swap two variables without using a temporary variable (Simple Pseudocode  Example)

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BEGIN
NUMBER a,b
a=10, b=20
OUTPUT "Value of a :"+a
OUTPUT "Value of b :"+b
a=a+b
b=a-b
a=a-b
OUTPUT "Value of a :"+a
OUTPUT "Value of b :"+b
END
 

 

Pseudocode Example 20: Print Numbers from 1 to n. (Pseudocode For Loop Example)

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BEGIN
NUMBER counter,n
INPUT n
FOR  counter = 1 TO  n STEP 1 DO
     OUTPUT counter
ENDFOR
 
END
 

 

Pseudocode Example 21: Calculate the Sum and Average of n Number. (Pseudocode For Loop Example)

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BEGIN
NUMBER counter,n,sum,avg
INPUT n
FOR  counter = 1 TO  n STEP 1 DO
     sum=sum+counter
ENDFOR
avg=sum/n
OUTPUT "Sum of numbers :"+sum
OUTPUT "Average of numbers :"+avg
END
 

Pseudocode Example 22: Design the algorithm and flowchart that finds and display the larger of the two numbers given different from each other.

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BEGIN
 
Number n1,n2
 
Input n1
 
Input n2
 
    IF (n1>n2) THEN
OUTPUT(n1+" is higher")
    ELSE IF(n2>n1)
OUTPUT(n2+" is higher")
    ELSE
OUTPUT("n1=n2")
    END IF
END
 

 

Pseudocode Example 23: Perform the application that calculates the area of the triangle whose height and base length entered by the keyboard.

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BEGIN
 
Number b,h
,area
Input b
 
Input h
 
area=(b*h)/2
OUTPUT (Area of Triangle is "+area)
END
 

 

Pseudocode Example 24: The voltage (V) between the poles of a conductor is equal to the product of the current (I) passing through the conductor and the resistance (R) present on the conductor. It’s demonstrated by the V = I * R formula. What is the algorithm of the program that calculates the voltage between the poles of the conductor by using the formula according to the current and resistance values entered by the user.

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BEGIN
Number i,r,v
Input i
Input r
v=i*r
OUTPUT (v)
END
 

 

Pseudocode Example 25: What is the algorithm that the number entered by the user from the keyboard fully divided if it is divided into 3 and 5 .

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BEGIN
Number num
Input num
    IF(num%3==0 AND num%5==0)
OUTPUT(num+ " is divided into 3 and 5")
END
 

Pseudocode Examples 26: What is the algorithm that finds and shows on the screen that the water is in the form of solid, liquid or gaseous according to the temperature?

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BEGIN
Number temp
Input temp
    IF(temp<=0)
OUTPUT("solid state")
    ELSE IF(temp<100)
OUTPUT("liquid state")
    ELSE
OUTPUT("gaseous state")
END
 

Pseudocode Examples 27: While calculating the wage of a worker at a factory, these criterias are complied;
If the worker has worked less than 40 hours, the wage is calculated by multiplying the hours worked and the hourly wage, if the employee has worked for 40 hours or more, the hours worked calculated as 2 hours. What is the algorithm that prints the amount to be paid according to this information?

 

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BEGIN
Number hour,fee,total
INPUT(hour)
INPUT(fee)
    IF(hour<40)
total=hour*fee
    ELSE IF(hour>=40)
total=hour*2*fee
    END IF
OUTPUT(total)
END
 

Pseudocode Examples 28: Program to Find GCD of Two Numbers

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BEGIN
NUMBER n1 , n2 , gcd = 1, i
OUTPUT "Enter first Number:"
INPUT n1
 
OUTPUT "Enter second Number:"
INPUT n2
FOR  i = 1; i <= n1 && i <= n2; ++i THEN
    
IF n1 % i == 0 && n2 % i == 0 THEN
gcd = i
        END IF
END FOR
 
OUTPUT " G.C.D of "+n1+"and "+n1+" is "+ gcd
END
 

 

Flowchart:

 

Pseudocode Examples 29: The LCM of two integers n1 and n2 is the smallest positive integer that is perfectly divisible by both n1 and n2 (without a remainder)

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BEGIN          
NUMBER n1 , n2 , lcm;
 
OUTPUT "Enter first Number:";
INPUT n1
 
OUTPUT "Enter second Number:";
INPUT n2
lcm = (n1 > n2) ? n1 : n2;
 
WHILE (true) THEN
 
IF (lcm % n1 == 0 && lcm % n2 == 0) THEN
      OUTPUT "The LCM of "+n1+"and "+n2+" is "+ lcm;
                    BREAK WHILE;
END IF
++lcm;
 
END WHILE
 
END
 

Flowchart

Examples 30:

If student’s grade is greater than or equal to 60

    Print “passed”

else

    Print “failed”

Examples 31:

Set total to zero

Set grade counter to one

While grade counter is less than or equal to ten

    Input the next grade
    Add the grade into the total

Set the class average to the total divided by ten

Print the class average.

Examples 32.

Initialize total to zero

Initialize counter to zero

Input the first grade

while the user has not as yet entered the sentinel

    add this grade into the running total
    add one to the grade counter
    input the next grade (possibly the sentinel)

if the counter is not equal to zero

    set the average to the total divided by the counter
    print the average

else

    print ‘no grades were entered’

Examples 33.

initialize passes to zero

initialize failures to zero

initialize student to one

while student counter is less than or equal to ten

    input the next exam result
    • if the student passed

      • add one to passes

else

    • add one to failures

add one to student counter

print the number of passes

print the number of failures

if eight or more students passed

    print “raise tuition”

 

Examples 34: Pseudocode of Bubble sort technique:

Set n to number of records to be sorted
repeat
flag = false;
for counter = 1 to n-1 do
if key[counter] > key[counter+1] then
swap the records;
set flag = true;
end if
end do
n = n-1;
until flag = false or n=1
OR the same can be expressed more concisely in words as below
repeat
set a flag to False
for each pair of keys
if the keys are in the wrong order then
swap the keys
set the flag to True
end if
next pair
until flag is not set.

 

 

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Source:

https://www.go4expert.com/articles/pseudocode-tutorial-basics-t25593/

https://www.wikihow.com/Write-Pseudocode

 

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