c - 在C中的同一循环中读取具有相同行数的多个文件

Question

我有两个文件，都有 47k 行。我试图同时读取每个文件的行。问题是只读取每个文件的第一行。那是我写的代码:

id_region = fopen(argv[3], "r");
prediction=fopen(argv[4], "r");

int prediction_class, class, region;

while ((fscanf(id_region,"%d  1:%d",&class,&region) == 2) && (fscanf(prediction,"%d",&prediction_class) == 1))
{

     fprintf(stderr,"\nRegião %d",region);
     fprintf(stderr,"\nClasse %d",class);
     fprintf(stderr,"\nPredição %d",prediction);
}

我的代码有什么问题？

编辑:我试过这段代码，但是当我运行它时出现段错误。这里有什么问题吗？

int main(int argc, char** argv)
{

    FILE* id_region;
    FILE* prediction;   

    id_region = fopen(argv[1], "r");
    prediction=fopen(argv[2], "r");

    char line[50];
    char line2[50];

    int prediction_class,region,temp1,temp2;

    while((fgets (line,10,prediction) != NULL) && (fgets (line2, 10, id_region)!=NULL))
    {
      //formating the input
      temp1=fscanf(line,"%d",&prediction_class);
      temp2=fscanf(line2,"%d",&region);

      fprintf(stderr,"\nRegion: %d",region);
      fprintf(stderr,"\nPrediction: %d",prediction_class);
    }

    fclose(prediction);
    fflush(prediction);
    fclose(id_region);
    fflush(id_region);   

    return(0);


 }

已通过此代码解决 - 谢谢!

 int main(int argc, char** argv)
 {

  FILE* id_region;
  FILE* prediction; 

  id_region = fopen(argv[1], "r");
  prediction=fopen(argv[2], "r");

  char line[50];
  char line2[50];

  int prediction_class,region,class;
  contador=0;

  while((fgets(line,10,prediction)!= NULL) && (fgets(line2, 20, id_region)!=NULL))
 {


  sscanf (line,"%d", &prediction_class);
  sscanf (line2,"%d  1:%d",&class,&region);
  fprintf(stderr,"\nRegion: %d",region);
  fprintf(stderr,"\nPrediction: %d",prediction_class);



 }


   fclose(prediction);
   fflush(prediction);
   fclose(id_region);
   fflush(id_region);   

    return(0);


}

Answer 1

代替fscanf()，您应该使用fgets()获取每一行，并使用sscanf()获取格式化输入从线条。

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对于编辑后的问题，我至少发现了两个问题:您仍在使用 fscanf()，而它应该是 sscanf()。并且您正在使用 fflush() after 使用 fclose() 关闭流。实际上 fclose() 会导致流刷新，您不需要手动刷新它们。