What Will I Learn?

• You will learn how to make a credit card definer
• You will learn how to use variables

Requirements

Write here a bullet list of the requirements for the user in order to follow this video tutorial.

• Knowledge of coding
• Eclipse and Java
• Must have credit card or know how to generate one

Difficulty

• Basic

Description

Hello,in this tutorial i made a program that defines credit cards brand by its number.With this program you can easily find out your credit or bank cards type of brand.

       import java.util.*;
public class CreditCardFinder {
public static void main(String[] args) {
 
@SuppressWarnings("resource")
Scanner input = new Scanner(System.in);
System.out.println("Write your credit card number :");
String id = input.nextLine();
 
while (id.length() != 16) {
System.out.println("Wrong Input.Credit Card Must Have 16 Numbers!");
id = input.nextLine();
}       
int x = sumAgain(id);
int y = sum(id);
 
if (isValid(x, y)) {
System.out.println("Your Card Number Is True");type(id);
} else {
System.out.println("Your Card Is Out Of Use ");
        }
    }
 
    public static int sum(String myid) {
 
int sum1 = 0;
for (int i = myid.length() - 2; i >= 0; i -= 2) {
int x = Character.getNumericValue(myid.charAt(i));
int y = x * 2;
if (y >= 10) {
int a = (y % 10) + 1;
sum1 += a;
} else
sum1 += y;
}
return sum1;
    }
 
    public static int sumAgain(String myid) {
int sum2 = 0;
for (int i = myid.length() - 1; i >= 0; i -= 2) {
    int x = Character.getNumericValue(myid.charAt(i));
sum2 += x;
}
return sum2;
    }
    
    public static boolean isValid(int x,int y) {
        if ((x + y) %10 == 0)
            return true;
        return false;
    }
    
    public static void type(String myid)
    {
    switch(Character.getNumericValue(myid.charAt(0)))
    {
    case 3:System.out.println("Your Card Is ---- American Express");break;
    case 4:System.out.println("Your Card Is ---- Visa");break;
    case 5:System.out.println("Your Card Is ---- Master Card");break;
    default:System.out.println("Your Card Is ---- Discover Card");break;
    
    }
    }
}

Video Tutorial

Curriculum

• Tutorial 1
• Tutorial 2

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Posted on Utopian.io - Rewarding Open Source Contributors

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