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C++——簡單檔案輸入輸出

檔案輸入執行個體:

ofstream outFile;         //outFile an ofstream object

ofstream fout;                // fout an ofstream object

outFile. open("fish. txt");//outFile used to write to the fish. txt file

char filename[50];

cin>>filename;                //user specifies a name

fout. open(filename);                    //fout used to read specified file

double wt=125.8;

outFile << wt;                        //write a number to fish.txt

char line[81]="Objects are closer than they appear.";

fout << line << endl;                  // write a line of text

outFile.close();

檔案輸出執行個體:

ifstream inFile;

//inFile an ifstream object

ifstream fin;//fin an ifstream object

下面示範了如何将這種對象與特定的檔案關聯起來:

inFile.open(nbowling.txt");//inFile used to read bowling.txt file

char filename[50];

cin>>filename;// user specifies a name

fin.open(filename);//fin used to read specified file

注意,方法open()接受一個C-風格字元串作為參數,這可以是一個字面

字元串,也可以是存儲在數組中的字元串。

下面示範了如何使用這種對象:

double wt;

inFile>>wt;// read a number from bowling.txt

char line[81];

fin.getline(line,81);//read a line of text