betamoo - Page 3 - Developer IT

C++ struct sorting error

- by Betamoo

I am trying to sort a vector of custom struct in C++ struct Book{ public:int H,W,V,i; }; with a simple functor class CompareHeight { public: int operator() (Book lhs,Book rhs) { return lhs.H-rhs.H; } }; when trying : vector<Book> books(X); ..... sort(books.begin(),books.end(), CompareHeight()); it gives me exception "invalid operator <" What is the meaning of this error? Thanks

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C# Array Maximum

- by Betamoo

I have 2 arrays named Arr1 and Arr2 in C#. They are of the exact same dimensions... I need to get the element of Arr1 corresponding to maximum of elements in Arr2 beginning with given indices ... e.g Get indices of the max of Arr2 [ 1 , 10 , 3 , i , j ] for all i,j Return Arr1 [ 1 , 10 , 3 , i , j ] Of course I need the elegant solution (not the "loop for them" one...) Please Note: I do not want to loop through the arrays, because it is 11 dimensional!!.. the code will be ugly and error prone.. and I may run out of variable names :)

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C++ increment operator

- by Betamoo

How to differentiate between overloading the 2 versions of operator ++ ? const T& operator ++(const T& rhs) which one? i++; ++i;

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#define usage in C/C++

- by Betamoo

I need to write such a define in C++ #define scanf( fscanf(inf, in order to replace each scanf( with fscanf(inf, literary But I do not know how... Thanks

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C++ struct sorting

- by Betamoo

I have a vector of custom Struct that needs to be sorted on different criteria each time Implementing operator < will allow only one criteria But I want to be able to specify sorting criteria each time I call C++ standard sort. How to do that? Please note it is better to be efficient in running time.. Thanks

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C# Strange Behavior

- by Betamoo

I have a custom struct : struct A { public int y; } a custom class with empty constuctor: class B { public A a; public B() { } } and here is the main: static void Main(string[] args) { B b = new B(); b.a.y = 5;//No runtime errors! Console.WriteLine(b.a.y); } When I run the above program, it does not give me any errors, although I did not initialize struct A in class B constructor..'a=new A();'

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using scanf in C/C++

- by Betamoo

To read an int using scanf we use: scanf("%d",i); What if i is long not int?? Note: when using %d with long it gives me an irritating warning.. Thanks!

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C# stop and continue..

- by Betamoo

I need some way to do the following efficiently in C#: Make program execution stop until certain value is changed. Note: I do not want to make it with a while loop to avoid wasting cpu power..

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