Input Validation and Frame-Based UI for a Web Expense Tracker

To restrict user input to integers only (excluding decimals), use the folowing HTML input with an oninput handler that strips non-digit characters: <input type="text" name="amount" id="amount" oninput="this.value = this.value.replace(/[^\d]/g, '')" placeholder="Numbers only"> For date inp ...

Posted on Sun, 14 Jun 2026 17:02:25 +0000 by DaRkZeAlOt

SQL Injection Concepts and Prevention Techniques

Understanding SQL Injection SQL injection is a prevalent form of cyber attack that exploits vulnerabilities in database query construction. It typical occurs when user input is directly concatenated into SQL queries without proper validation or sanitization, allowing attackers to manipulate SQL logic or execute arbitrary commands. Example of SQ ...

Posted on Fri, 15 May 2026 13:00:35 +0000 by Asperon

Validating Input with scanf_s in C++

To sum user-input numbers until a non-numeric character terminates the program, check the return value of scanf_s. It returns the count of successfully read items, so a return value of 1 indicates valid input. #include <iostream> #include <cstdio> int main() { int value = 0; long total = 0L; int result; do { ...

Posted on Sun, 10 May 2026 21:23:57 +0000 by john010117

C Programming Practice: Random Generation, Menu Systems, and Input Validation

Task 1: Generate Student IDs Based on Random Major Selection The following program generates five student IDs. Each ID starts with either 20256343 (for one major) or 20256136 (for another), followed by a four-digit number. The selection between majors is randomized. #include <stdio.h> #include <stdlib.h> #include <time.h> #de ...

Posted on Sun, 10 May 2026 09:06:22 +0000 by chucklarge