Which of the following Array Declarations Are Not Legal

Which of the following options is not problematic at compile time or run-time? 1) What is the value of a[1] after running the following code? int[] a = {0, 2, 4, 1, 3}; for(int i = 0; i a[i] = a[(a[i] + 3) % a.length]; Which of the following correctly declares a variable that can contain an array of 10 integers? A – This creates an array of length 5. Each element of this array is an array of 4 ints. The size of the table cannot be specified as indicated in points (b) and (e). Member declarations in an interface do not allow the use of certain declaration modifiers. You cannot use Transient, Ephemeral, or Synchronized in a member declaration in an interface. In addition, you should not use private and protected identifiers when declaring members of an interface. Option C is incorrect because it indicates a declaration of a legal table without initialization. Option B declares a 3D array allowed. Option D declares a 2D array allowed. The size of an array is always associated with the instance of the array (right), not the table reference (left). 5) What is the result of this program? class array_output { public static void main(String args[]) { int array_variable [] = new int[10]; for (int i = 0; i { array_variable[i] = i; System.out.print(array_variable[i] + ” “); i++; } } } The D option is incorrect (and does not compile) because it declares an array with a size.

Tables should never be given a size when they are declared. (1), (2) and (3) are correct. Interfaces can have constants that are always implicitly public, static, and definitive. Public, static, and final interface constant declarations are optional in any combination. The size of the array is implicitly specified by the initialization code. While it is legal to omit size for later dimensions of a multidimensional array, the former is required. Option A declares a 2D array allowed. (3) and (5) are incorrect because you cannot declare a table of only one size.

Size is only necessary if the array has actually been instantiated (and the JVM needs to know how much space to allocate to the array, depending on the array type and size). (1), (3) and (6) are correct. character C1 = 064770; is an octal representation of the integer value 27128, which is legal because it fits into an unsigned 16-bit integer. char c3 = 0xbeef; is a hexadecimal representation of the integer value 48879 that fits in a 16-bit unsigned integer. char c6 = `uface`; is a Unicode representation of a character. (1), (2) and (4) are legal statements. You can use a table declaration to place square brackets to the right or left of the identifier. Option A sounds strange, but it`s perfectly legal to divide parentheses into a multidimensional array and place them on either side of the identifier. Although programming this way would only annoy your fellow programmers, for the exam you should know that it is legal. int[] ia, ba; Here, IA and BA are both int.

Multidimensional arrays are created by creating tables that can contain references to other tables. int ia[], ba; Here there is only the AI table int and ba is an int. What is printed in the following code when it is compiled and executed? 2) To declare a one-dimensional array, use this general form Option B is the legal way to declare and initialize an array with five elements. Which of the following code fragments correctly initializes a two-dimensional array of characters named cA with a size that refers to cA[2][3] to a valid element? The notation [] can be placed both before and after the variable name in an array declaration. 4) Which of the following statements is valid? Which of these statements and chart instantiations are legal? D – This creates an array of length 4. Each element in this array is null. However, you can assign an ints array of any length to each element. Example: a[0] = new int[10];//valid a[1] = new int[4];//valid a[2] = new int[]; invalid because you must specify the length a[3] = new Object[] //invalid, because a[3] can only refer to an array of ints. This shows that when creating a one-dimensional array, the length must be specified, but when creating multidimensional arrays, the length of the last dimension cannot be specified.

In addition, the length of several larger dimensions after the first cannot be specified even if none of the dimensions are specified later. For example, a[][][][][] = new int[4][3][3][5]; is the same as a[][][][] = new int[4][][][][]; (Note that the first dimension must be specified.) Therefore, multidimensional arrays do not need to be symmetrical. Which of the following options does an array declare and initialize with five numbers? The A option is incorrect because it shows an example of instantiating a class named Array, passing an integer value of 5 to the object`s constructor. If you don`t see the brackets, you can be sure that there is no real array object! In other words, an Array object (an instance of the Array class) is not the same as an Array object. What valid declarations exist in an interface definition? One. int[ ] i[ ] = { { 1, 2 }, { 1 }, { }, { 1, 2, 3 } }; B. int i[ ] = new int[2] {1, 2}; C. int i[ ][ ] = new int[ ][ ] { {1, 2, 3}, {4, 5, 6} } ; D. int i[ ][ ] = { { 1, 2 }, new int[ 2 ] }; E.

int i[4] = { 1, 2, 3, 4 } ;. Option B is incorrect. The last modifier means that this method cannot be constructed in a subclass. A final method cannot be abstract. Option D is incorrect. protected is not allowed when declaring a method of an interface. See information below. Imagine a coal-fired steam plant that produces 175 MW of electricity. The plant operates on a simple ideal Rankine cycle with turbine inlet conditions of 7 MPa and 550∘C550^{circ} mathrm{C}550∘C and a capacitor pressure of 15 kPa. Coal has a calorific value (energy released during fuel combustion) of 29 300 kJ/kg. Assuming that 85% of this energy is transferred to steam in the boiler and that the electric generator has an efficiency of 96%, determine (a) the overall efficiency of the facility (the ratio of net electricity generation to energy input as fuel) and (b) the rate of coal supply required. Where are geophysical disasters such as volcanoes and earthquakes most likely? One.

Former inland seas, b. areas with moderate temperatures, c. fluvial delta plate boundaries. double daaa[][][] = new double[3][][]; double d = 100.0; double[][] daa = new double[1][1]; tank c2 = `face`; is incorrect because you cannot insert more than one character into a character literal. The only other acceptable character literal that can be enclosed in single quotes is a Unicode value, and Unicode literals must always begin with a `u`. Option C is incorrect. static refers to the class, not an instance. 1. char[][] cA = { { `a`, `b`, `c` }, { `a`, `b`, `c` } }; 2. tank cA[][] = new tank[3][]; for (int i=0; i<cA.length; i++) cA[i] = new char[4]; 3.char cA[][] = { new char[ ]{ `a`, `b`, `c` } , new char[ ]{ `a`, `b`, `c` } }; 4char cA[3][2] = new char[][] { { `a`, `b`, `c` }, { `a`, `b`,`c` } }; 5.char[][] cA = { "1234", "1234", "1234" }; Ein.