🧠 Logic Building

Learn to Think Before You Code

🚀 Start Learning 💡 View Examples
PROBLEM → UNDERSTAND → INPUT / OUTPUT → BREAK STEPS → ALGORITHM → PSEUDOCODE → FLOWCHART → DRY RUN → CODING

1️⃣ What is Logic?

🍵 Real-Life Analogy: Making Tea

Step 1: Take water in a pan Step 2: Boil the water Step 3: Add tea leaves Step 4: Add milk Step 5: Add sugar Step 6: Boil for 2 minutes Step 7: Filter and serve tea

2️⃣ Problem Solving Process

1
Understand
Read question 2-3 times.
2
Identify Input
What data is given?
3
Identify Output
What result is expected?
4
Break Steps
Divide into tiny parts.
5
Algorithm
Write plain steps.
6
Pseudocode
Write structured steps.
7
Flowchart
Draw visual diagram.
8
Dry Run
Test manually on paper.

3️⃣ Input → Process → Output (IPO)

Problem 📥 Input ⚙️ Process 📤 Output
Add two numbers A = 10, B = 20 Sum = A + B (10 + 20) 30
Check Even or Odd N = 7 Check 7 % 2 == 0? (Remainder 1) "Odd"
Area of Rectangle Length = 5, Breadth = 4 Area = 5 × 4 20
Voting Eligibility Age = 19 Is 19 >= 18? (Yes) "Eligible to Vote"

4️⃣ How to Break a Problem

Example Task: Calculate Simple Interest

Breakdown Thought Process:

  • 1. What values do I need from the user? → Principal (P), Rate (R), Time (T).
  • 2. What formula converts these inputs to interest? → (P × R × T) / 100.
  • 3. Where do I store the answer? → In a variable called `Interest`.
  • 4. What should I display? → The value of `Interest`.

5️⃣ Algorithm

Rules for a Good Algorithm:

  • ✅ Always start with START and finish with END.
  • ✅ Each step must be clear and unambiguous.
  • ✅ Steps must be executed in order from top to bottom.

✏️ Basic Algorithm Examples

Example 1: Add Two Numbers

Step 1: START Step 2: Input number A and number B Step 3: Calculate SUM = A + B Step 4: Display SUM Step 5: END

Example 2: Convert Celsius to Fahrenheit

Step 1: START Step 2: Input temperature in Celsius (C) Step 3: Calculate F = (C * 9/5) + 32 Step 4: Display F Step 5: END

6️⃣ Pseudocode

Basic Keywords:

Keyword Purpose Example
INPUT / READ Get data from user INPUT A, B
OUTPUT / PRINT Show result on screen OUTPUT SUM
IF / ELSE Make decision based on condition IF Age >= 18 THEN PRINT "Adult"
← or = Assign value to variable Area ← Length * Breadth

Example Pseudocode: Find Larger of Two Numbers

START INPUT A, B IF A > B THEN OUTPUT "A is larger" ELSE IF B > A THEN OUTPUT "B is larger" ELSE OUTPUT "Both are equal" ENDIF END

7️⃣ Flowchart

🔹 Standard Flowchart Symbols

Oval
Start / End
Parallelogram
Input / Output
Rectangle
Process
Diamond
Decision

🔄 Interactive Flowchart Examples

Flowchart 1: Add Two Numbers

START
Input A, B
SUM = A + B
Display SUM
END

Flowchart 2: Check Even or Odd

START
Input N
Is N % 2 == 0 ?
YES
Display "Even"
NO
Display "Odd"
END

8️⃣ Logic Building Tips

💡 Tip 1: Always read the problem twice.
💡 Tip 2: Clearly isolate Input vs. Output first.
💡 Tip 3: Solve sample examples manually on paper.
💡 Tip 4: Never open a code editor without pseudocode.
💡 Tip 5: Break big conditions into simple IF statements.
💡 Tip 6: Draw flowcharts when logic feels tangled.
💡 Tip 7: Perform dry runs with boundary values.
💡 Tip 8: If code fails, fix logic on paper first.
💡 Tip 9: Speak your steps out loud.
💡 Tip 10: Practice daily; logic is a muscle!

9️⃣ Dry Run — Basic Introduction

Example Dry Run Trace Table

INPUT Amount IF Amount > 1000 THEN Discount = Amount * 0.10 ELSE Discount = 0 ENDIF FinalPrice = Amount - Discount PRINT FinalPrice
Step Amount Condition Discount FinalPrice Output
Case 1 1200 1200 > 1000? (TRUE) 1200 * 0.10 = 120 1200 - 120 = 1080 1080
Case 2 800 800 > 1000? (FALSE) 0 800 - 0 = 800 800

💡 Solved Logic Problems (25 Guides)

📝 Practice Arena — "Now You Try"

🧠 Logic Building Cheat Sheet

1
Read problem twice
2
Find Input & Output
3
Break into steps
4
Identify formula
5
Write Algorithm
6
Write Pseudocode
7
Draw Flowchart
8
Dry Run on paper
9
Test boundary cases
10
Then write Code!

🎯 Before You Write Your First Line of Code

🎨 Advanced Flowchart Studio & Scratchpad

Shapes add karein, drag karke move karein, double-click karke text edit karein aur Connector & Arrows se connect karein!

💡 Mode: Select / Move | Double-click any shape to edit text.