Quiz 2D Array

When using a doubly-nested loop to process all of the elements of a two-dimensional array in row-major order, the outer loop will iterate over the rows.

True

When using a doubly-nested loop to process all of the elements of a two-dimensional array in column-major order, the outer loop will iterate over the columns.

True

When using a doubly-nested loop to process all of the elements of a two-dimensional array in column-major order, the outer loop will iterate over the rows.

False

The number of rows and columns in a two-dimensional array need not be the same.

True

The number of rows and columns in a two-dimensional array must be the same.

False

If a two-dimensional array has more rows than columns, then the array can still be processed in both row-major order and column-major order.

True

The declaration and allocation of a two-dimensional array need not be done in the same statement.

True

The declaration and allocation of a two-dimensional array must be done in the same statement.

False

In a two-dimensional array A, the number of columns is given by A[i].length, where i is an integer variable containing a valid row number.

True

In a two-dimensional array A, the number of rows is given by A.length.

True

The maximum number of dimensions that a Java array can have is theoretically unlimited, but implementations limit it to 255.

True

The row i of a 2D array of integers can be deleted with row[i] = new int[0].

True

The row i of a 2D array of integers cannot be deleted with row[i] = new int[0].

False

The row i of a 2D array of integers can be deleted with row[i].length = 0;

False

The row i of a 2D array of integers cannot be deleted with row\[i\].length = 0;

True

The updating section of a for loop may contain multiple statements separated by comma

True

An inner loop initialization and termination conditions may use the control variable of the outer loop

True

An outer loop can have any number of nested inner loop

True

Assuming 0<=pos1<=pos2<=A.length-1, the length of the array with elements pos1 to pos2 is pos2-pos1.

False

Assuming 0<=pos1<=pos2<=A.length-1, the length of the array with elements pos1 to pos2 is pos2-pos1+1.

True

The individual elements of an array A are indexed from 0 to A.length-1.

True

An array need not be always declared and allocated in the same Java statement

True

The number of elements in an array A can be accessed as A.length

True

The number of elements in an array A can be accessed as A\[0\].length

False

The base type of an array include int, double, boolean, char, and String.

True

The base type of an array can be int, double, boolean, char, but not String.

False

int\[\] a = {32, 16, 4, 91, 12}; // This both allocates the space for the array and initializes it

True

int\[\] A=new int\[10\]; A\[A.length-1\] = 100; would not cause an error (either compiler or run-time)

True

A\[-1\] accesses the last element of the array A

False

A\[-1\] cannot access the last element of the array A

True

A\[A.length-1\] cannot access the last element of the array A

False

One cannot enlarge the array A by 1 using A.length++;

True

One can enlarge the array A by 1 using A.length++;

False

One cannot free a array A from memory by setting its length to zero with A.length=0;

True

The following code would generate an error attempting to set the length of array A to 10: int\[\] A; A\[9\]=0;

True

The following code sets the length of array A to 10: int\[\] A; A=new int\[10\]; A\[9\]=0;

True

The following code would generate an error attempting to set the length of array A to 10: int\[\] A; A=new int\[10\]; A\[9\]=0;

False

int\[\] A; A\[0\]=0; would generate an error attempting to create an array with the first element set to 0;

True

int\[\] A does not create an array with space already allocated, like int A\[\].

True

int\[\] A create an array with space already allocated, unlike int A\[\].

False

int a\[\],b,c; creates an array a and two integer variables b and c.

True

int\[\] a,b\[\],c\[\]; is equivalent with: int a\[\], b\[\],c\[\];

False

int\[\] a,b\[\],c\[\]; is equivalent with: int a\[\], b\[\]\[\],c\[\]\[\];

True