从单个源文件创建多个文件

Question

我目前正在学习 C 并试图解决一个问题。我有一个名为 elements.txt 的文本文件，其中包含以下内容:

元素.txt

Carbon (from Latin: carbo "coal") is a chemical element  ..

Oxygen is a chemical element with symbol O ..

Platinum is a chemical element with symbol Pt ...

Silicon is a chemical element with symbol Si ...

Titanium is a chemical element with symbol Ti ...

我想根据元素创建多个文件，例如 carbon.txt、oxygen.txt、platinum.txt、silicon.txt 和 titanium.txt 来自 elements.txt。

这是我的源代码:

  void magic(){
  FILE *fp,*fp1, *fp2, *fp3, *fp4, *fp5;
  char *fn, *fn1, *fn2, *fn3, *fn4, *fn5;
  int ch;

  fn1 = "new/carbon.txt";
  fn2 = "new/oxygen.txt";
  fn3 = "new/platinum.txt";
  fn4 = "new/silicon.txt";
  fn5 = "new/titanium.txt";

  fn = "elements.txt";

  // Read file
  fp = fopen(fn ,"r");
  if(fp == NULL){
    printf("Error opening %s for reading. Program terminated",fn);
  }

  // Write file
  fp1 = fopen(fn1, "w");
  fp2 = fopen(fn2, "w");
  fp3 = fopen(fn3, "w");
  fp4 = fopen(fn4, "w");
  fp5 = fopen(fn5, "w");

  if(fp1 == NULL || fp2 == NULL || fp3 == NULL || fp4 == NULL || fp5 == NULL){
    printf("Error opening %s for wrting. Program terminated",fn);
  }

  while( (ch= fgetc(fp)) != '\n')
    fputc(ch, fp1);

  while( (ch= fgetc(fp)) != '\n')
    fputc(ch, fp2);

  while( (ch= fgetc(fp)) != '\n')
    fputc(ch, fp3);

  while( (ch= fgetc(fp)) != '\n')
    fputc(ch, fp4);

  while( (ch= fgetc(fp)) != EOF)
    fputc(ch, fp5);

  printf("All files were created successfuly!.\n");
    fclose(fp1);
    fclose(fp2);
    fclose(fp3);
    fclose(fp4);
    fclose(fp5);
    fclose(fp);
}



  int main(){
    magic();
    return 0;
  }

我确实创建了我的文件，但氧气用铂打印，铂、硅和钛用钛打印。似乎有一个错误，当我在做一个 while 循环读取字符时。不确定如何解决此问题。有没有办法使用 for 循环读取多个文件并写入多个文件？

任何帮助将不胜感激!谢谢

Answer 1

正如评论所建议的，为了使这个 block 正确，你应该添加一个return语句:

 if(fp1 == NULL || fp2 == NULL || fp3 == NULL || fp4 == NULL || fp5 == NULL){
    printf("Error opening %s for wrting. Program leaving",fn);
    return; //add this statement to leave function
  }

否则，声明程序终止将是一个谎言。

如果您希望您的代码处理包含仅包含空格的行的输入文件(而不是修改您的输入文件)，请在将该行放入输出文件之前添加针对仅包含空格的行的测试。使用 fgets()、strstr() 和 strlen() 将适合创建此类测试。