C++

• Introduction
• Getting Output
• Datatype
• Variable Declaration
• Operator
• String Concatenation
• Getting input from user
• Working on Angles
• Escape Sequence
• Conditional Statements
• If statement
• Switch statement
• Loop
• While Loop
• For Loop
• Do While Loop
• Array
• Foreach Loop
• Multi dimensional array
• Nested Loop
• Jump Statements
• String Handling Function
• Methods or Functions
• Passing Parameter
• Method Overloading
• Void Method
• Returning Method
• Class
• Creating New Instance
• Constructor
• Constructor Overloading
• Destructor
• Inheritance
• Multi Level Inheritance
• Multiple Inheritance
• Sealed Class
• Pointers
• Upcasting
• Virtual Method
• Pure Virtual Method
• Enum
• Inline Function
• Validation of data
• Virtual Destructor
• Namespace
• Header File
• Exception Handling
• File Handling

Validation of data

We studied how to get input from user. We can check whether user input value is valid or not. This operation of validating is known as Data Validation. Inputs have to be validated before allowing any kind of processing or operations to be performed on it. This is extremely important because , an unhandled wrong input might have the ability to crash a system. C++ has some good validation techniques that can be used to validate most kind of inputs.

CODE

EG 1 . Validating data of user input.

#include <iostream>
using namespace std;

int main() {
    int number;
    cout << "Enter Number : ";
    if (cin >> number) {
        cout << "It is acceptable value" << endl;
    }
    else {
        cout << "It is unacceptable value" << endl;
    }
}


CODE EXPLANATION
In the above code we created a variable called number and getting its value as user input. The variable number is of numerical datatype(int). If user gives any non numerical values like character and word, how system can store it inside numerical variable number. So in this place using data validation is crucial. Try compiling above code by giving numerical values and non numerical values as input. If user gives numerical value, system will accept that value store it to number variable and first if condition will turns to true , It is acceptable value text will be printed out. If user gives any non numerical value, system will not accept that value so that first if condition will turns to false , It is unacceptable value text will be printed out.

What is the benefit of using Data Validation?
As we already discussed in definition, Inputs have to be validated before allowing any kind of processing or operations to be performed on it. This is extremely important because , an unhandled wrong input might have the ability to crash a system. If we don't want our system to crash, It is important to use Data Validation.