26. Prefix Expression Evaluation | Algorithm + Example (Stack) | Same Result Proof | Suraku Academy
Welcome to Prefix Expression Evaluation by Suraku Academy.
In this video, we learn how to evaluate Prefix Expressions (Polish Notation) using a stack-based algorithm, which is one of the most important applications of stack in Data Structures.
This lecture is designed to build deep conceptual understanding with step-by-step explanation and exam-oriented approach.
Topics Covered in This Video:
✔ What is Prefix Expression (Quick Revision)
✔ Stack-based Evaluation Algorithm
✔ Step-by-step Execution of Algorithm
✔ Solved Examples (Standard & Exam-Level)
✔ Proof that result of expression is same in:
• Infix
• Prefix
• Postfix
✔ Verification using examples
✔ Why evaluation order changes but result remains same
✔ Right-to-Left scanning in Prefix evaluation
✔ Operand & Operator handling
✔ Stack behavior during evaluation
✔ Number of elements in stack at a time
✔ Common mistakes in solving prefix expressions
📂 Useful Playlists:
Data Structure and Algorithm (Computer Instructor) : • Data Structure and Algorithm (Computer Anu...
Computer Instructor (Anudeshak) Concept Clear MCQs Series : • Computer Anudeshak 2026 | MCQs + PYQs Full...
Dynamic Memory Allocation (DMA) in C Language : • Dynamic Memory Allocation (DMA) in C Langu...
C Lanugage (Deep Dive Series) : • C Lanugage (Deep Dive Series)
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Free Resources Available :
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▶️ Youtube : / @surakuacademy
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🎓 Useful For Exams:
• Computer Instructor / Computer Anudeshak
• PGT Computer Science
• TGT Computer Science
• UGC NET Computer Science
• BCA / MCA Students
• BTech Students
• UP LT Grade
• ISRO / Technical Exams
• Other Computer Science Competitive Exams
This topic is extremely important for Stack applications, expression handling, and competitive exams.
We don’t just evaluate expressions — we explain complete logic behind each step.
Stay consistent. Practice daily.
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