Update CheckDigit.java

APCSLowell · Apr 30, 2024 · 98adfb1 · 98adfb1
1 parent 70cb2b2
commit 98adfb1
Showing 1 changed file with 14 additions and 0 deletions.
diff --git a/src/main/java/CheckDigit.java b/src/main/java/CheckDigit.java
@@ -8,6 +8,14 @@ public class CheckDigit
  public static int getCheck(int num) 
  { 
  /* to be implemented in part (a) */
+
+ int adder = 0;
+ int multiplier = 7;
+ for (int i = 1; i <= getNumberOfDigits(num); i++){
+ adder = adder + (getDigit(num,i) * multiplier);
+ multiplier--;
+ }
+ return (getDigit(adder, getNumberOfDigits(adder)));
  }
 
  /** Returns true if numWithCheckDigit is valid, or false 
@@ -19,6 +27,12 @@ public static int getCheck(int num)
  public static boolean isValid(int numWithCheckDigit) 
  { 
  /* to be implemented in part (b) */ 
+
+ int storer = getCheck(numWithCheckDigit/10);
+ if (storer == (numWigthCheckDigit % 10){
+ return true; 
+ }
+ return false;
  } 
 
  /** Returns the number of digits in num. */