Infix to Postfix Conversion in C | Full C Program & Data Structures Algorithm

Published: 17 October 2025
on channel: freeplacementcourse

Ready to code the Infix to Postfix algorithm? In this video, we implement the complete Stack-based conversion logic in C. We'll walk through the header files (ctype.h, string.h), define our precedence rules, and write a robust main function to handle complex mathematical expressions.
We cover:
✅ Declaring a Character Stack for operators.
✅ Using isalpha() to separate operands from operators.
✅ Implementing a Precedence Function with switch cases.
✅ The pop-until-parenthesis logic for bracketed expressions.
✅ Full code execution with test cases like (A+B)/(C-D).
📍 Timestamps:
00:00 - Introduction to the C Implementation
01:20 - Defining the Character Stack & Global Variables
02:58 - Writing the pop() function (Returning a char)
04:04 - Creating the precedence() function logic
06:14 - Using strcat() to prepare the input string
08:29 - The Main Scanning Loop: isalpha() and Operands
12:15 - Handling Operators: Comparing Precedence
14:40 - The while loop for Right Parenthesis )
19:00 - Step-by-Step Code Walkthrough
24:19 - Final Test: Converting (A+B)/(C-D)
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#CProgramming #DataStructures #InfixToPostfix #StackAlgorithm #CodingTutorial #SajjitKumarDSA #DSA #PlacementPrep #ComputerScience

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