Invalid Allocation Size

[mahta]

I get the error- Invalid Allocation Size - for this part of my code:

int var;
float *res;
cin>>var;
res=new float[var+1];

Why is it like that and what can I do to fix it?

[MiiNiPaa]

Is it compile or runtime error?

[mahta]

runtime error

[MiiNiPaa]

What you have entered?
Because your code should be valid.

[mahta]

2

[MiiNiPaa]

It should work: http://ideone.com/5y5LlM
Problem is in your compiler or project settings

[mahta]

Thank you very much!