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C++でテキストに書き出す方法

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基本的な事柄だが、頻繁に利用するので書き留めておくことに。

手始めに基本となるサンプルコードを。

outputfile01.cpp
#include<iostream>
#include<fstream>

using namespace std;

int main()
{
    ofstream outputfile("test.txt");
    outputfile<<"test";
    outputfile.close();
}

fstreamをincludeして、ofstream 変数名("吐き出したいテキスト名")で定義します。
そして、変数名<<書き出したい内容;で吐き出したい内容を記入。
最後は、変数名.close();と書いて終了させる。

他にもちょっとだけサンプルコードを下に書き残しておきます。

outputfile02.cpp
#include<iostream>
#include<fstream>

#define F "test.txt"

using namespace std;

int main()
{
    char inputTxt;
    ofstream outputfile(F);
    
    cout<<"何か文字を記入してください。:";
    cin>>inputTxt;
    cout<<"あなたが記入した文字を"<<F<<"に書き出しました。"<<endl;
    
    
    outputfile<<inputTxt;
    outputfile.close();
}
outputfile03.cpp
#include<iostream>
#include<fstream>

#define F "test.txt"
#define n 9

using namespace std;

int main()
{
    int i,j,input[n][n];
    ofstream outputfile(F);
    
    cout<<"\n九九を表示します。\n\n"<<endl;
    outputfile<<"\n九九を表示します。\n\n\n";
    
    for (int i=1; i<=n; i++) {
        for (int j=1; j<=n; j++) {
            input[i][j]=i*j;
            outputfile<<input[i][j]<<"\t";
            cout<<input[i][j]<<"\t";
        }
        outputfile<<"\n";
        cout<<endl;
    }
    outputfile<<"\n";
    cout<<endl;
    outputfile.close();
}
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