Allocating memory to double pointer

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double *p;
p=new double[10]; --> It is showing error

how to allocate memory to p??

What I have tried:

double *p;
p=new double[10];

Posted 20-May-16 17:57pm

Member 12063711

Updated 21-May-16 3:40am

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OriginalGriff · Answer 1 · 2016-05-20T19:56:00

Solution 1

Without knowing the error, it's not possible to be exact, but the chances are you forgot to use fixed:

C#

private unsafe void myMethod()
    {
    fixed (double* p = new double[10])
        {
        ...
        }
    }

Posted 20-May-16 19:56pm

OriginalGriff

Sergey Alexandrovich Kryukov · Answer 2 · 2016-05-21T03:40:00

In C#, pointers are allowed only in special cases, only under unsafe content. Please see:
unsafe (C# Reference)[^],
Unsafe Code Tutorial (C#)[^].

Pointers to managed memory usually related to pinning:
fixed Statement (C# Reference)[^].

All the above is used very rarely in the cases when you need much deeper understanding of the technology.

From your question, it's apparent that you don't really need pointers, you are just unaware how .NET and C# work on the high level. With .NET, you are working with managed memory. You don't deallocate memory and not allocate it explicitly, instead, memory is allocated when you use constructors of the reference types (you will need to learn reference types vs. value types) and initialization of arrays:

C#

double[] myArray = new double[10];
// that's all

See also: Garbage collection (computer science) — Wikipedia, the free encyclopedia[^].

You really need to grab the manual on the platform, language and general programming and read it all, from the beginning to the end; it would be the best to do the simplest exercises. Perhaps, you may also need to "unlearn what you have learned".

—SA