Understanding c++ source code [on hold]

I need to translate the following C++ code to C# code,

    weightsVector.push_back( (( (float)rand() / ((float)(RAND_MAX)+(float)(1)) )) - 0.5); //[-0.5,0.5]

    inputVector.resize(inputNumber);////std::vector inputVector;

How can I convert them to C#?

But, I am stuck with RAND_MAX and inputVector.resize(inputNumber);.

How can I convert them to C#?

What are the equivalent code?