尝试通过函数从文件中读取和输出数据

Question

我编写了一个能够从文件中读取、输出和计算信息的代码。该文件本身是一个精心设计的 DNA 序列，称为“dnaSequence.txt”。通过我的代码读取文件中的数据时遇到了一些麻烦。我将所有数据放入 3 个不同的函数中，这些函数能够正确显示并创建我需要制作的文件，但我遇到的问题是这些函数无法读取文件。想知道我做错了什么。

我应该使用 ostream& type 参数，但不确定将它放在哪里。

int Adenine = 0;
int Thymine = 0;
int Cytosine = 0;
int Guanine = 0;
    
char numbNucs;
    
float totalNucleotides = 0;
    


// func 1:
void nucleotideCounterFunc (int Adenine, int Thymine, int Cytosine, int Guanine, char numbOfNucs, float totalNucleotides){

    ifstream dnafile("DNA.txt");
    
    if (dnafile){
        cout << "DNA.txt can be read." << endl;
        cout << "Proceeding to analysis of the DNA Sequence..." << endl;
    } else {
        cout << "Error opening dnaSequence.txt: Please try again" << endl;
    }
    
    cout << " " << endl;
    
    while(dna_file >> numbNucs){
        if (numbNucs == 'A')
        {
            Adenine++;
        }
        
        else if (numbNucs == 'T')
        {
            Thymine++;
        }
        
        else if (numbNucs == 'C'){
            Cytosine++;
        }
        
        else if (numbNucs == 'G'){
            Guanine++;
        }
    }
    
}

// func 2:
void formatOutputFunc (int Adenine, int Thymine, int Cytosine, int Guanine, float totalNucleotides){
    totalNucleotides = Adenine + Thymine + Guanine + Cytosine;
    
    cout << "DNA Sequence Analysis: " << endl;
    cout << totalNucleotides << " nucleotides in the sequence" << endl;
    
    cout << " " << endl;
    
    cout << "Sequence breakdown: " << endl;
    cout << "Adenine: " << Adenine << "     " << (Adenine/totalNucleotides) * 100 << "%" << endl;
    cout << "Thymine: " << Thymine << "     " << (Thymine/totalNucleotides) * 100 << "%" << endl;
    cout << "Cytosine: " << Cytosine << "     " << (Cytosine/totalNucleotides) * 100 << "%" << endl;
    cout << "Guanine: " << Guanine << "     " << (Guanine/totalNucleotides) * 100 << "%" << endl;
    
}


// func 3: 
void formatNewFileFunc(int Adenine, int Thymine, int Cytosine, int Guanine, float totalNucleotides){
      
    ofstream dna_finished("Post_Analysis.txt");
    
    if (dna_finished) {
        cout << "DNA Sequence Analysis Complete" << endl;
    }

    dna_finished<< totalNucleotides << " nucleotides in the sequence" << endl;
    
    dna_finished<< " " << endl;
    
    dna_finished<< "Sequence breakdown: " << endl;
    dna_finished<< "Adenine: " << Adenine << "     " << (Adenine/totalNucleotides) * 100 << "%" << endl;
    dna_finished<< "Thymine: " << Thymine << "     " << (Thymine/totalNucleotides) * 100 << "%" << endl;
    dna_finished<< "Cytosine: " << Cytosine << "     " << (Cytosine/totalNucleotides) * 100 << "%" << endl;
    dna_finished<< "Guanine: " << Guanine << "     " << (Guanine/totalNucleotides) * 100 << "%" << endl;


    dna_finished<< " " << endl;
    
}

int main()
{
    
    nucleotideCounterFunc(Adenine, Thymine, Cytosine, Guanine, numbOfNucs, totalNucleotides);
    
    cout << " " << endl;
    
    formatOutputFunc(Adenine, Thymine, Cytosine, Guanine, totalNucleotides);

    cout << " " << endl;

    formatNewFileFunc(Adenine, Thymine, Cytosine, Guanine, totalNucleotides);

    return 0;
}

至于我的输出：一切都是 ~nan% 很想知道我做错了什么。 我知道我应该使用 ostream& 参数类型但不确定如何集成它