Problem of the Day

Monday, March 2, 2026

Problem:

The int array vals stores a series of values. Which of the following code segments will reverse the order of that array of values?

1. 
   

   for (int i = 0; i < vals.length / 2; i++)
   {
       int j = vals.length - i - 1;
       int tmp = vals[i];
       vals[i] = vals[j];
       vals[j] = tmp;
   }

2. 
   

   int[] vals2 = new int[vals.length];
   int j = 0;
   for (int i = vals.length - 1; i >= 0; i--)
   {
       vals2[j] = vals[i];
       j++;
   }
   vals = vals2;

3. 
   

   int j = vals.length - 1;
   for (int i = 0; i < vals.length / 2; i++)
   {
       int tmp = vals[i];
       vals[i] = vals[j];
       vals[j] = tmp;
       j--;
   }

1. I only
2. II only
3. I and II only
4. I and III only
5. I, II, and III

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