By Meriem Varone
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Additional resources for Irresistibles bagues de perles: Volume 3
Example text
The statement: my1nt = myFloat * myDouble; cannot be compiled and produces a compiler error, since Java cannot implicitly convert from the float and double types to the weaker int type. 2 is implicitly double. If you want to convert a stronger type to a weaker type you need to do so explicitly. 2; myInt = (int)myFloat * (int)myDouble; System. println(myInt); a value of 20 is produced. Additional integer operators In addition to the usual assignment operator (=) Java has a range of shortcuts available.
The third column in the table shows the output from these pairs of inputs. The & operator is applied to all pairs of corresponding bits in the variables concerned. For example 19 & 135. 19 in binary is 0000 0000 0001 0011. 135 in binary is 0000 0000 1000 0111. 0000 0000 0001 0011 0000 0000 1000 0111 0000 0000 0000 0011 & 2+1 = 3 The result of applying the & operator is 0000 0000 0000 0011 in binary which is 3 in decimal. 4 The 1 operator. 5 The 1\ operator. A o o 1 1 B o o o r o 1 1 1 191\ 135 is given by: 0000 0000 0001 0011 0000 0000 1000 0111 0000 0000 1001 0100 1\ 128+16+4=148 The shift operators move the whole pattern of bits either to the left or the right.
The single line: int[ ] values new int[5]; = is equivalent to : int values[ ]; values = new int[5]; The array elements are initialized, 0 for numbers, false for booleans, null for strings and \0 for characters, however you can specify the initial values of the array elements: int[ ] values (3, 45, 87, 23, 9); = This defmes a five element array of integers and assigns value[O] the number 3, value[1} the number 45 and so on. When strings are initialized each string item is enclosed in quotes: String[ } languages = {"Java", "C++", "Object Pascal''}; If you want to change an array element you do so by specifying its name and the element that you want to change: languages[2] = "Visual Basic"; A common problem in C++ is that if you defme an array as having, for example, 10 elements and you try and write to an element greater than this at run time, unexpected problems can happen.