Write the pseudocode to print the bill depending upon the price and quantity of an item. Also print Bill GST,

Exercise · Q6

Q. Write the pseudocode to print the bill depending upon the price and quantity of an item. Also print Bill GST, which is the bill after adding 5% of tax in the total bill.

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Concept understanding — Iteration With Condition

Iteration With Condition

Imagine you're searching for a lost key in a dark room. You don't know how many steps you'll need — you just keep moving your hand along the floor until you feel the metal. You're repeating the same action (searching), but you stop only when a specific condition is met (you touch the key).

That's iteration with a condition. It's the idea of repeating a process not a fixed number of times, but while something remains true, or until something becomes true.

The Intuition

Most everyday loops are conditional. You don't say "I will stir the tea exactly 47 times." You say "I will stir the tea until the sugar dissolves." The number of stirs depends on when the condition (sugar dissolved) is satisfied.

In programming and mathematics, this is far more natural than a fixed-count loop. You often don't know in advance how many repetitions you'll need — you only know the rule that should keep you going, or the rule that should stop you.

The Precise Statement

An iteration with condition is a control structure that repeatedly executes a block of statements as long as a given Boolean condition evaluates to true. The condition is checked before (or after) each execution of the block.

The two standard forms are:

1. While loop (entry-controlled)

while (condition):
    statement(s)

The condition is tested first. If it's true, the block runs; then the condition is tested again. If it's false from the start, the block never runs.

2. Do-while loop (exit-controlled)

do:
    statement(s)
while (condition)

The block runs once unconditionally, then the condition is tested. If true, it repeats; if false, it stops. This guarantees at least one execution.

Watch out

A common mistake is writing a condition that never becomes false — an infinite loop. For example, while (x > 0) where x is never decreased. The program will run forever (or crash). Always ensure the body of the loop changes something that affects the condition.

A Concrete Example

Suppose you want to find the smallest power of 2 greater than 1000. You don't know the answer in advance — you need to keep doubling until you cross the threshold.

n = 1
while (n <= 1000):
    n = n * 2

Trace it:

Start: n = 1. Is 1 <= 1000? Yes → n = 2
n = 2. Is 2 <= 1000? Yes → n = 4 …

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Compute the bill from price × quantity, then add 5% tax for the GST bill:

PRINT_BILL
    INPUT price
    INPUT quantity
    bill = price * quantity
    billGST = bill + (5 / 100) * bill
    PRINT "Bill amount =", bill
    PRINT "Bill with GST =", billGST
END
``` …

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Bill = price × quantity; Bill GST = bill + 5% of bill — two inputs, two computed outputs.

The idea. This is a straight input–process–output computation with a percentage step. The tax is 5% of the bill, i.e. (5/100) * bill, added on top of the bill. Writing the two amounts as separate variables (bill, billGST) keeps both available for printing.

Pseudocode

PRINT_BILL_WITH_GST
Step 1: INPUT price
Step 2: INPUT quantity
Step 3: COMPUTE bill = price * quantity
Step 4: COMPUTE billGST = bill + (5 / 100) * bill
Step 5: PRINT "Bill amount =", bill
Step 6: PRINT "Bill with GST =", billGST
END

(Equivalently, billGST = bill * 1.05.)

Python verification

price = float(input("Enter price of the item: "))
quantity = int(input("Enter quantity: "))
bill = price * quantity
billGST = bill + (5 / 100) * bill
print("Bill amount =", bill)
print("Bill with GST =", billGST)

Sample run

Enter price of the item: 200
Enter quantity: 3
Bill amount = 600.0
Bill with GST = 630.0
``` …

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Q.Write the pseudocode to print the bill depending upon the price and quantity of an item. Also print Bill GST, which is the bill after adding 5% of tax in the total bill.

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