C: Programming and Compiling in Java

Add Quick Response Code in Java C: Programming and Compiling
Appendix C: Programming and Compiling
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The parentheses on subroutines are optional, if there are no parameters passed. Notice that each line must end in a semi-colon. Scalar variables In Perl, variables do not have to be declared before they are used. Whenever you use a new symbol, Perl automatically adds the symbol to its symbol table and initializes the variable to the empty string. It is important to understand that there is no practical difference between zero and the empty string in Perl except in the way that you, the user, choose to use it. Perl makes no distinction between strings and integers or any other types of data except when it wants to interpret them. For instance, to compare two variables as strings is not the same as comparing them as integers, even if the string contains a textual representation of an integer. Take a look at the following program: #!/local/bin/perl # # Nothing! # print "Nothing == $nothing\n"; print "Nothing is zero !\n" if ( $nothing == 0) ; if ($nothing eq "") { print STDERR "Nothing is really nothing!\n" ; } $nothing = 0 ; print "Nothing is now $nothing\n" ; The output from this program is: Nothing == Nothing is zero! Nothing is really nothing! Nothing is now 0 There are several important things to note here. First, we never declare the variable 'nothing'. When we try to write its value, Perl creates the name and associates a NULL value to it, i.e. the empty string. There is no error. Perl knows it is a variable because of the $ symbol in front of it. All scalar variables are identified by using the dollar symbol. Next, we compare the value of $nothing to the integer '0' using the integer comparison symbol ==, and then we compare it to the empty string using the string comparison symbol eq. Both tests are true! That means that the empty string is interpreted as having a numerical value of zero. In fact any string which does not form a valid integer number has a numerical value of zero. Finally, we can set Snothing explicitly to a valid integer string zero, which would now pass the first test, but fail the second. As extra spice, this program also demonstrates two different ways of writing the if command in Perl.
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The default scalar variable. The special variable $_ is used for many purposes in Perl. It is used as a buffer to contain the result of the last operation, the last line read in from a file, etc. It is so general that many functions which act on scalar variables work by default on $_ if no other argument is specified. For example, print; is the same as print $_; Array (vector) variables The complement of scalar variables is arrays. An array in Perl is identified by the @symbol and, like scalar variables, is allocated and initialized dynamically: array [0] = "This little piggy went to market" ; @array[2] = "This little piggy stayed at home" ; print " array[0] @array[l] @array[2]"; The index of an array is always understood to be a number, not a string, so if you use a nonnumerical string to refer to an array element, you will always get the zeroth element, since a non-numerical string has an integer value of zero. An important array which every program defines is
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This is the argument vector array, and contains the commands line arguments by analogy with the C-shell variable Sargv [ ]. Given an array, we can find the last element by using the $# operator. For example, $last_element = $ARGV[$#ARGV]; Notice that each element in an array is a scalar variable. The $ cannot be interpreted directly as the number of elements in the array, as it can in the C-shell. You should experiment with the value of this quantity - it often necessary to add 1 or 2 to its value in order to get the behaviour one is used to in the C-shell. Perl does not support multiple-dimension arrays directly, but it is possible to simulate them yourself. (See the Perl book.) Special array commands The shift command acts on arrays and returns and removes the first element of the array. Afterwards, all of the elements are shifted down one place. So one way to read the elements of an array in order is to repeatedly call shift: $next_element=shift(@myarray); Note that, if the array argument is omitted, then shift works on @ARGV by default.
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