9.9.1. Arrays-WE7-P1¶

Subgoals for Evaluating Arrays

Set up array from 0 to size-1
Evaluate data type of statements against array
Trace statements, updating slots as you go
1. Remember assignment subgoals

Arrays-WE7-P1

Put the following code in order to create a method that will find the last occurrence of a target value and return the index of where that value is located.

        public static int find (int [] arr, int target) {
---
   int loc = -1;
---
   for (int i = 0; i < arr.length; i++) {
---
      if (arr[i] == target)
---
         loc = i;
---
   }
---
   return loc;
}

Put the following code in order to create a method that will find the first occurrence of a target value and return the index of where that value is located.

        public static int find (int [] arr, int target) {
---
   int loc = -1;
   boolean found = false;
---
   for (int i = 0; i < 20 && !found; i++) {
---
      if (arr[i] == target) {
---
         loc = i;
         found = true;
---
      }
   }
---
   return loc;
}

Put the following code in order to create a method that will count the number of occurrences of a target value and return the count.

        public static int count (int [] arr, int target) {
---
   int num = 0;
---
   for (int i = 0; i < arr.length; i++) {
---
      if (arr[i] == target)
---
         num++;
---
   }
---
   return num;
}