Using the loop integer to define variables: c++

Question

I have a for-loop which runs over i. For every iteration, I wish that it creates a variable with the name var_i i.e if my loop runs over i=0<

Answer 1

You can't create variables at runtime. Use std:vector instead so you'll get var[0], var[1], etc.

Answer 2

You can't, variable names must be known at compile-time. You can't create new variable names at run-time.

An alternative is to have a std::map or a std::vector if your variables are continuous.

std::map<int,int> int_;
std::vector<int> vint_;
vint_.resize(5);
for ( int i = 0 ; i <= 4 ; i++ )
{
   int_[i] = i;
   vint_[i] = i;
}

Your variables would be int_[0] or vint_[0] through int_[4] or vint_[4].

Answer 3

You can also use an array of the required size and initialize it with a default value in the loop

int var[4];
for(int i=0; i < 4; i++){
    var[i] = 0;
}