CS302 Exam 2 Spring 2013 Reference Solution

Part IV

1. Write a class method ...

    public static void rotate( int [] a, boolean right ) {
        int t;
        if ( right ) { 
            t = a[a.length-1];
            for ( int i=a.length-1; i > 0; i-- ) 
                a[i] = a[i-1];
            a[0] = t;
        } else { 
            t = a[0];
            for ( int i=0; i < a.length-1; i++ ) 
                a[i] = a[i+1];
            a[a.length-1] = t;
        }
    }
    
    
2. Write a code fragment ...

   int [][] rValues = new int[rLetters.length][];
   for ( i = 0; i < rValues.length; i++ ) {
       rValues[i] = new int[rLetters[i].length];
       for ( int j = 0; j < rValues[i].length; j++ ) {
           rValues[i][j] = rLetters[i][j] - ’A’;
       }
   }