fscanf rewind

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本文通过一个示例展示了如何使用fscanf从文件中读取浮点数和字符串。首先创建并写入数据到myfile.txt，然后使用rewind重置文件位置指针到开始处，接着读取之前写入的数据。

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/* fscanf example */
#include <stdio.h>
 
int main ()
{
  char str [80];
  float f;
  FILE * pFile;
 
  pFile = fopen ("myfile.txt","w+");
  fprintf (pFile, "%f %s", 3.1416, "PI");
  rewind (pFile);
  fscanf (pFile, "%f", &f);
  fscanf (pFile, "%s", str);
  fclose (pFile);
  printf ("I have read: %f and %s \n",f,str);
  return 0;
}
  
 
This sample code creates a file called myfile.txt and writes a float number and a string to it. Then, the stream is rewinded and both values are read with fscanf. It finally produces an output similar to:
 
I have read: 3.141600 and PI