argument-passing

问题 I have a function called createmenu . This function will take in an array as the first argument. The second argument will be the size of the array. I then want to create a select menu using the elements of that array. This is what I have so far: Create the menu with the given array createmenu () { echo $1 echo "Size of array: $2" select option in $1; do if [ $REPLY -eq $2 ]; then echo "Exiting..." break; elif [1 -le $REPLY ] && [$REPLY -le $2-1 ]; then echo "You selected $option which is

问题 So today I figured (for the first time admittedly) that int foo() is in fact different from int foo(void) in that the first one allows any number of inputs and the second one allows zero . Does int foo() simply ignore any given inputs? If so, what's the point of allowing this form of function? If not, how can you access them and how is this different from having a variable argument list (e.g. something like int foo (int argc, ...) )? 回答1: The key to understanding this is understanding the

问题 I'm pretty new on Julia and have a question that may appear simple. Say I have a function, which I will name test(x::Vector, arg1, arg2) where x is a vector of variables and the function has two arguments arg1 & arg2 . I would like to optimize (minimize) the function test with respect to the vector x . I can't figure out how to use the optimize function from the Optim package that accepts two arguments values. In R, one may do as following: optim(initial guest, test, arg1=value1,arg2=value2)

问题 I'm pretty new on Julia and have a question that may appear simple. Say I have a function, which I will name test(x::Vector, arg1, arg2) where x is a vector of variables and the function has two arguments arg1 & arg2 . I would like to optimize (minimize) the function test with respect to the vector x . I can't figure out how to use the optimize function from the Optim package that accepts two arguments values. In R, one may do as following: optim(initial guest, test, arg1=value1,arg2=value2)

问题 Scenario : I'm implementing a parent activity which executes other activity from external source(database), following this Ron Jacobs post. This approach works but have a few problems in my case, because WorkflowInvoker don't get the parent extensions: Tracking is disabled for childrens My custom data sharing extension don't work Extensions can change depending on the host, so I can't simply add new ones again. Potential solution : Instead of Invoke the children XAML, I'm scheduling it(I

问题 Scenario : I'm implementing a parent activity which executes other activity from external source(database), following this Ron Jacobs post. This approach works but have a few problems in my case, because WorkflowInvoker don't get the parent extensions: Tracking is disabled for childrens My custom data sharing extension don't work Extensions can change depending on the host, so I can't simply add new ones again. Potential solution : Instead of Invoke the children XAML, I'm scheduling it(I

问题 I've just learned the convention for popping off the first element of the arguments array (which I also learned is actually an Object ). Now I need to do the opposite. I need to use an unshift operation to add a value to the beginning of the arguments array (or Object acting like an array). Is this possible? I tried: Array.prototype.unshift.apply('hello', arguments); That had no effect on arguments whatsoever. 回答1: use .call() instead of .apply() to invoke unshift() set arguments as the this

问题 I'm trying to write a function that takes a 2D vector as an argument. This compiles just fine, but I get a segmentation fault whilst execution. //http://www.codechef.com/problems/SUMTRIAN #include<iostream> #include<algorithm> #include<vector> using namespace std; int max_sum_path(int maximum_rows,vector<vector<int> >& matrix,int row_index,int colm_index); int main() { vector<vector<int> > Triangle; int num_test_cases; cin>>num_test_cases; //to iterate over the test cases for(int i=0;i<num

问题 Most people will probably say this is a bad idea. I want to use the content of a string as the name of a variable. I want to accomplish the dreaded: s = 'x' x = 1 where the variable name x comes (somehow?) from the string s . To answer the "why?", say I have a global default value for x that I want the option of overriding in a function. But: x = 0 def f(**kw): print x f(x=1) prints 0 not 1 . If I could use the strings in kw.keys() to reassign x (or any other globally set variables) then I'd

问题 Like in C and other languages, you can give to the script/.exe arguments when you physically execute the script. For example: myScript.exe Hello 10 P Whereby Hello, 10 and P are passed to some variable in the program itself. Is this possible in Powershell? and if so, how do you give those args to a given $variable Thanks! 回答1: Define your script with a param block like so: -- Start of script foo.ps1 -- param($msg, $num, $char) "You passed in $msg, $num and $char" You can further type qualify