How can I alert an integer value in flex. I have a variable called total which is an integer.
If I try to alert it using
var total:int=myTest.length;
Alert.show(total);
it throws an errors saying that
1067: Implicit coercion of a value of type int to an unrelated type String.
the show method accepts only string values. How can I alert this int value?
Actually, what I want is to know the value stored in the total variable.
Alert.show(total.toString());
reference
Related
When I define a custom type, it seems that the type of the underlying type makes a difference about whether I can pass it to a function as is or I need to convert it.
Question is:
Why does RuneFunc and StringMap work, but not Integer?
https://play.golang.org/p/buKNkrg5y-
package main
type RuneFunc func(rune) rune
type Integer int
type StringMap map[string]string
func main() {
//m := make(StringMap)
//mf(m)
var i Integer = 5
nf(i)
//var f func(rune) rune
//ff(f)
}
func mf(i map[string]string) {
}
func ff(i func(rune)rune) {
}
func nf(i int) {
}
Here, when I run this function called nf with Integer it complains although int is the underlying type. But when I call mf or ff they run successfully.
Integer and int
int and your new type Integer are 2 different, distinct types. Where Integer is expected, you have to pass a value of type Integer.
If you have an Integer value, you may use a simple type conversion to make it a value of type int, because the underlying type of Integer is int:
var i Integer = 5
nf(int(i))
What may be confusing and interesting at the same time is that you are allowed to pass an untyped constant without conversion:
nf(5)
Try these on the Go Playground.
The reason for this is in the Spec: Assignability:
A value x is assignable to a variable of type T ("x is assignable to T") in any of these cases:
[...]
x is an untyped constant representable by a value of type T.
5 is an untyped constant which is representable by a value of type int because the untyped constant 5 has a default type int, so it is representable by a value of type Integer (which has the same default type).
If you check the other assignability rules (not included in above quotation), none of them match the case where you attempt to pass a value of Integer for the parameter of type int, so that's not allowed.
See related question: Golang: Creating a Constant Type and Restricting the Type's Values
RuneFunc and func(rune) rune
The difference between this case and the previous one (Integer and int) is that int is a named type and func(rune) rune is not.
And there's an assignability rule which allows this:
x's type V and T have identical underlying types and at least one of V or T is not a named type.
So in this case:
var f RuneFunc
ff(f)
f is a named type, but the parameter type of ff() is func(rune) rune which is unnamed, so the assignment is allowed.
Go has a strict type system. Just because your type is merely an alias for int doesn't mean you can interchange the two freely, you'll still have to do a type conversion. Below is a working version of your main, here's the code on play ground: https://play.golang.org/p/BDTXnnG9Lg
We can do this in Cython so that whenever the return value is -1, Cython generates a call to PyErr_Occurred():
cdef int spam() except?-1:
However, what if the return type is a struct?
ctypedef struct A:
double x
double y
cdef A spam() except ?????
Say, I want to define an error value to be: A(x=1, y=-1). Is it possible to do that?
According to the docs this is probably not possible.
This note can be found at the end of the Error return values section of cython's docs
Exception values can only declared for functions returning an integer, enum, float or pointer type, and the value must be a constant expression. Void functions can only use the except * form.
You can't specify an error value, but you can let errors propagate by writing
cdef A spam() except *:
[code that may raise exceptions]
which will implicitly use the PyErr_Occurred macro rather than the return value to determine whether an error occurred.
I have a variable "RowCountStr" in my ssis package of type string, I have another variable "RowCountInt" of type Int32, I need to compare these two variables. I tried to type cast the variable "RowCountStr" but I could not, please let me know how can I typecast a variable of type string to Int32.
Thank you.
If you are trying to cast an integer as a string, try this:
(DT_STR,10,1252)#[User::IntegerVariable]
To cast from string to integer, try this;
(DT_I4)#[User::StringVariable]
You may also want to check for NULL values in the string variable.
My code is this:
symboll.addEventListener(Event.ENTER_FRAME, symboll);
function ball_hit_wall(e:Event):void{
(symboll.hitTestObject(box));
{
gotoAndPlay(3)
}
}
And the error message that i am getting is this:
1067: Implicit coercion of a value of type flash.display:SimpleButton to an unrelated type Function.
I'm new to actionscript, what did i do wrong
symboll and box are both buttons
Method addEventListener expects second argument of the type Function, while you're providing type SimpleButton.
Try replace your code
symboll.addEventListener(Event.ENTER_FRAME, symboll);
with
symboll.addEventListener(Event.ENTER_FRAME, ball_hit_wall);
Let's say I have a class with some a couple properties:
public class MyClass {
public var fooProp:*;
public var barProp:Object;
}
What is the difference, practically speaking, between these? Are there variable types I can later assign to fooProp that I cannot assign to barProp?
Only untyped variables can hold the value undefined. Untyped variables are variables that either lack any type annotation, or use the asterisk * symbol for type annotation.
From ActionScript data type descriptors:
In previous versions of ActionScript, a variable with no type
annotation was automatically assigned the Object data type. This is no
longer true in ActionScript 3.0, which now includes the idea of a
truly untyped variable. Variables with no type annotation are now
considered untyped. If you prefer to make it clear to readers of your
code that your intention is to leave a variable untyped, you can use
the new asterisk (*) symbol for the type annotation, which is
equivalent to omitting a type annotation. The following example shows
two equivalent statements, both of which declare an untyped variable:
var x
var x:*
Only untyped variables can hold the value undefined. If you attempt to
assign the value undefined to a variable that has a data type, Flash
Player or Adobe AIR will convert the value undefined to the default
value of that data type. For instances of the Object data type, the
default value is null, which means that Flash Player or Adobe AIR will
convert the value undefined to null if you attempt to assign undefined
to an Object instance.
As an example:
var t:* = undefined;
trace(t); // outputs: undefined
var t:Object = undefined;
trace(t); // outputs: null