File Handling & Real-World Programs Programs in C, C++, Java, and Python
File Read/Write Program
Count Lines, Words, and Characters in File
Merge Contents of Two Files
Append Text to Existing File
Replace a Word in File
Sort Data from File
Find Word Frequency in File
Encrypt/Decrypt Text (Caesar Cipher)
Count Occurrences of a Word in a File
Simple Calculator using Switch
ATM Simulation Program
Railway Ticket Booking Logic
Billing System Program
User Login & Password Masking
URL Validator
Email Validator using Regex
Extract Phone Numbers from Text
Input Validation Program
Social Plugin