Select amount of integers

[m4k4v3l1]

I have a question:
I want to add some amount of numbers and find its average, but the numbers I add will be different, so what command I should use to chose how much integers I want to use?

[firedraco]

a.) Ask the user to input how many they want
or
b.) Use std::vector and let them input as many as they want until they input a specific value or something

[vorticidal]

int table[];
const int special=-1;
int sum;
int in;
int n;
int i;
for(i=0;;i++){
cin>>in;
if(in!=special)table[i]=in;
else break;}
for(n=0;n<i;n++)sum+=table[n];
sum/=n;
cout>>sum;

[jsmith]

That code at best stomps memory.