numbers

I'm tring to diplay results in php from sql database MySQL statement is correct and does what i want in phpMyAdmin but for some reason my code breaks in the webpage here is the code require_once('db.php'); $sql="SELECT * FROM modul1open WHERE idM1O>=(SELECT FLOOR( MAX( idM1O ) * RAND( ) ) FROM modul1open) ORDER BY idM1O LIMIT 1" $result = mysql_query($sql); echo [$result]; and here is what i get In general I need random number limited from min to max by the table id You need to fetch the data from each row of the resultset obtained from the query. You can use mysql_fetch_array() for this. //

I've got one textField where I only accept numbers from the keyboard, but now I have to change it as it's a "price textField" and I would also need to accept a dot "." for any kind of prices. How can I change this in order to get what I need? ptoMinimoField = new JTextField(); ptoMinimoField.setBounds(348, 177, 167, 20); contentPanel.add(ptoMinimoField); ptoMinimoField.setColumns(10); ptoMinimoField.addKeyListener(new KeyAdapter() { public void keyTyped(KeyEvent e) { char caracter = e.getKeyChar(); if (((caracter < '0') || (caracter > '9')) && (caracter != '\b')) { e.consume(); } } }); Suresh

I'm looking for a method that returns a boolean if the String it is passed is a valid number (e.g. "123.55e-9", "-333,556"). I don't want to just do: public boolean isANumber(String s) { try { BigDecimal a = new BigDecimal(s); return true; } catch (NumberFormatException e) { return false; } } Clearly, the function should use a state machine (DFA) to parse the string to make sure invalid examples don't fool it (e.g. "-21,22.22.2", "33-2"). Do you know if any such library exists? I don't really want to write it myself as it's such an obvious problem that I'm sure I'd be re-inventing the wheel.

If a string in Perl 5 passes looks_like_number , it might as well be a number. For instance, my $s = "10" + 5; results in $s being assigned 15 . Are there any cases where a string does not behave like its numeric equivalent would? When dealing with bitwise operators. 123 ^ 456 is 435, but "123" ^ "456" is "\x05\x07\x05" . The bitwise operators work numerically if either operand is a number. I can only think of one: when checking for truth. Strings that are equivalent to 0 , but that are not "0" , such as "0.0" , "0 but true" , "0e0" , etc. all pass looks_like_number and evaluate to 0 in

MY code is: function isNumber(n){ return typeof n == 'number' && !isNaN(n); } window.onload=function(){ var a=0,b=1,c=2.2,d=-3,e=-4.4,f=10/3; var shouldBeTrue=[a,b,c,d,e,f]; var aa="0",bb="1",cc="2.2",dd="-3",ee="-4.4",ff="10/3"; var shouldBeFalse=[aa,bb,cc,dd,ee,ff]; var aaa,bbb=true,ccc=false,ddd=document.getElementsByTagName('html'); var alsoTheseBeFalse=[aaa,bbb,ccc,ddd,""," ",,null,NaN]; for(var i=0;i<shouldBeTrue.length;i++) if(isNumber(shouldBeTrue[i]) != true) alert("x"); for(i=0;i<shouldBeFalse.length;i++) if(isNumber(shouldBeFalse[i]) != false) alert("x"); for(i=0;i<alsoTheseBeFalse

the code: #iclude <math.h> int main(){ double somenumber = pow(2, 1000); printf("%lf\n", somenumber); return 0; } i get this huge number: 10715086071862673209484250490600018105614048117055336074437503883703510511249361224931983788156958581275946729175531468251871452856923140435984577574698574803934567774824230985421074605062371141877954182153046474983581941267398767559165543946077062914571196477686542167660429831652624386837205668069376 This is obviously to big for double. How it's working? This is obviously to big for double. How it's working? 2 1000 is within the range of numbers that can be

>> a = 5 => 5 >> b = "hello, world!" => "hello, world!" >> b.dup => "hello, world!" >> a.dup TypeError: can't dup Fixnum from (irb):4:in `dup' from (irb):4 I understand that Ruby will make a copy every time you assign an integer to a new variable, but why does Numeric#dup raise an error? Wouldn't this break abstraction, since all objects should be expected to respond to .dup properly? Rewriting the dup method will fix the problem, as far as I can tell: >> class Numeric >> def dup() >> self >> end >> end Does this have a downside I'm not seeing? Why isn't this built into Ruby? Most objects in