A. Introduction
No code can be completed without troubleshooting. Hand tracing is a frequently used technique to verify the program works as designed.
B. Watch(slides)
C. Try:
sfolax6776
5 days ago
Discussion
A. Introduction A function can take a 1-D or 2-D array as input and manipulate the data elements. Once the function finishes processing, how to return the new array back to the caller? B. How to reflect a 2-D array vertically as shown below? i.e. turn A into B by moving the top row to the bottom, 2nd row to the 2nd but last... etc? class Reflect2DArray {
public static int[][] verticalReflect(int[][] arrayX){
// Swap rows up and down
int[][] temp = new int[arrayX.length][arrayX[0].length];
for (int row = 0; row < arrayX.length; row++)
for (int col = 0; col < arrayX[0].length; col++)
temp[arrayX.length - row -1][col] = arrayX[row][col];
return temp;
}
public static void print2DArray(int[][] arrayX){
for(int[] s:arrayX){
for(int sp: s)
System.out.print(sp + " ");
System.out.println();
}
}
public static void main(String[] args) {
int[][] speed = { {99, 42, 74, 83, 100}, {90, 91, 72, 88, 95},{88, 61, 74, 89, 96}, {61, 89, 82, 98, 93}, {93, 73, 75, 78, 99},{50, 65, 92, 87, 94}, {43, 98, 78, 56, 99} };
int[][] vReflect = verticalReflect(speed);
print2DArray(speed);
print2DArray(vReflect);
}
} C. Try: Create a function that rotates the elements of a 1-D array by one position, moving the initial element to the end of the array, as shown at right.