*4.21 (Check SSN) Write a program that prompts the user to enter a Social Security
number in the format DDD-DD-DDDD, where D is a digit. Your program should
check whether the input is valid. Here are sample runs:
Enter a SSN: 232-23-5435
232-23-5435 is a valid social security number
Enter a SSN: 23-23-5435
23-23-5435 is an invalid social security number
Enter a SSN: 232-23-5435
232-23-5435 is a valid social security number
Enter a SSN: 23-23-5435
23-23-5435 is an invalid social security number
import java.util.Scanner; public class ProgrammingEx4_21 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter a SSN:"); String s = input.nextLine(); for (int i = 0; i < s.length(); i++) { if ((i == 3 || i == 6) && s.charAt(i) == '-') { continue; } if (!Character.isDigit(s.charAt(i))) { System.out.println(s + " is an invalid social security number"); System.exit(0); } } System.out.println(s + " is a valid social security number"); } }
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