char Space = ' ';
   char Enter = '\n';
   FILE *out;
   float vector[3][5];  //我有一個二維陣列存放浮點數數字       out = fopen("D:\\samplevector.dat", "w");  //先開檔
   for(int index=0;index<3;index++)           //資料有三筆 大小三列五行
   {
      for(int i=0;i<5;i++)
         fprintf(out,"%f %c",vector[index][i],Space);  //將陣列寫出,每個數字以空白作間隔
      fprintf(out,"%c",Enter); //每筆資料都換一行寫
   }
   fclose(out);  //結束關檔 

 
    FILE *fp;
    float array[3][5];        ZeroMemory(array,sizeof(array));
    fp = fopen("C:\\aaa.txt","r");
    for ( int i = 0; i < 3; i   )
    {
        for ( int j = 0; j < 5; j   )
        {
            fscanf(fp, "%f", &array[i][j]);
        }
    }
    fclose(fp);