如何在C ++中将文本追加到文本文件？

Question

如何在C ++中将文本追加到文本文件？如果不存在则创建新的，如果存在则追加。

Answer 1

#include <fstream>

int main() {  

  std::ofstream outfile;

  outfile.open("test.txt", std::ios_base::app);

  outfile << "Data"; 

  return 0;

}

Answer 2

#include <fstream>

 #include <iostream>

 FILE * pFileTXT;

 int counter

int main()

{

 pFileTXT = fopen ("aTextFile.txt","a");// use "a" for append, "w" to overwrite, previous content will be deleted

 for(counter=0;counter<9;counter++)

 fprintf (pFileTXT, "%c", characterarray[counter] );// character array to file

 fprintf(pFileTXT,"\n");// newline

 for(counter=0;counter<9;counter++)

 fprintf (pFileTXT, "%d", digitarray[counter] );    // numerical to file

 fprintf(pFileTXT,"A Sentence");                   // String to file

 fprintf (pFileXML,"%.2x",character);              // Printing hex value, 0x31 if character= 1

 fclose (pFileTXT); // must close after opening

 return 0;

}