Question

… is what I want to do. I have the following code:

... 
    int len = 0; 
    char c; 
    bool fp = false;

    while (infile.good()) {
            c = infile.get();
            if (c == '\n') ++len;
            else if (c == '.') fp = true;
    }  

    if (fp == true){
            float Ai[N];
            float *Ao = new float [len];
    } else {
            int Ai[N];
            int *Ao = new int [len];
    }  

    for (int i=0; i<L; ++i){
            for (int j=0; j<N; ++j) infile >> Ai[j];
            Ao[i] = findmax(Ai);
    }
...

It is supposed to make the array out of doubles if a decimal point is detected in the file or, if not, out of integers.

I didn’t check the first loop yet because I didn’t get it to compile:

warning: unused variable ‘Ai’                                                         
warning: unused variable ‘Ao’
warning: unused variable ‘Ai’
warning: unused variable ‘Ao’
error: ‘Ai’ was not declared in this scope
error: ‘Ao’ was not declared in this scope

I suppose I have a fundamental problem with how to deal with this task and not just a simple error.

So, what is wrong and how to fix/make it right from the beginning?

Answer 1

Edit:
As commented above, your compiler error comes from Ao and Ai being declared in a different scope than where you are trying to use it.

---

This is where templates come in real handy.

template<typename T>
T *findMaxes(inFile)
{
    T Ai[N];
    T *Ao = new T[len];

    for (int i = 0; i < L; ++i)
    {
        for (int j = 0; j < N; ++j)
            infile >> Ai[j];
        Ao[i] = findmax(Ai);
    }

    return Ao;
}




int len = 0; 
char c; 
bool fp = false;

while (infile.good()) {
        c = infile.get();
        if (c == '\n') ++len;
        else if (c == '.') fp = true;
}  

if (fp)
{
    float *Ao = findMaxes<float>(inFile);

    // Do stuff with the floating point array
}
else
{
    int *Ao = findMaxes<int>(inFile);

    // Do stuff with the int array
}