Head First C中代码后面的奇数结果

我正在做一本书中的练习, Head First C 。我仔细检查了我的代码是否与书中的代码相同,并且我正在仔细遵循书中的步骤。

C文件应该采用gps数据,并将其格式化为JSON样式。

#include <stdio.h>

int main() {

    float latitude;
    float longitude;
    char info[40];
    int started = 0;

    puts("data=[");
    while (scanf("%f, %f, %39[^\n]", &latitude, &longitude, info) ==3) {
      if (started) 
        printf(", \n");

      else 
        started = 1;

          printf("{latitude: %f, longitude: %f, info: '%s'}", latitude, longitude, info);
    }
    puts("\n]");
    return 0;
}

首先,这本书让我们输入数据,向我们展示它看起来多么乏味和格式糟糕,然后我们学会重定向stdin以读取逗号分隔的数据文件,如下所示:

$ ./geo2json < gpsdata.csv

我在网上找不到源文件,所以我从书的pdf中复制/粘贴以创建csv文件。

gpsdata.csv and gpsdata.txt

42.363400,-71.098465,Speed = 21 
42.363327,-71.097588,Speed = 23
42.363255,-71.096710,Speed = 17
42.363182,-71.095833,Speed = 22
42.363110,-71.094955,Speed = 14
42.363037,-71.094078,Speed = 16
42.362965,-71.093201,Speed = 18
42.362892,-71.092323,Speed = 22
42.362820,-71.091446,Speed = 17
42.362747,-71.090569,Speed = 23
42.362675,-71.089691,Speed = 14
42.362602,-71.088814,Speed = 19
42.362530,-71.087936,Speed = 16
42.362457,-71.087059,Speed = 16
42.362385,-71.086182,Speed = 21

奇怪的事情发生了,所以我浏览了这些行并删除了,然后重新输入了换行符,以防有一些隐藏的格式。我试着将文件类型从.csv更改为.txt。两者都没有区别。当我输入数据时,这种奇怪的事情并没有发生。

它应该是什么样子:

它的实际外观。注意最后一行的不同。顺便说一句,有时纬度上的“l”会出现在最后一行。

login:~/programming/cfiles> ./geo2json < gpsdata.csv
data=[
'}, itude: 42.363400, longitude: -71.098465, info: 'Speed = 21
'}, itude: 42.363327, longitude: -71.097588, info: 'Speed = 23
'}, itude: 42.363255, longitude: -71.096710, info: 'Speed = 17
'}, itude: 42.363182, longitude: -71.095833, info: 'Speed = 22
'}, itude: 42.363110, longitude: -71.094955, info: 'Speed = 14
'}, itude: 42.363037, longitude: -71.094078, info: 'Speed = 16
'}, itude: 42.362965, longitude: -71.093201, info: 'Speed = 18
'}, itude: 42.362892, longitude: -71.092323, info: 'Speed = 22
'}, itude: 42.362820, longitude: -71.091446, info: 'Speed = 17
'}, itude: 42.362747, longitude: -71.090569, info: 'Speed = 23
'}, itude: 42.362675, longitude: -71.089691, info: 'Speed = 14
'}, itude: 42.362602, longitude: -71.088814, info: 'Speed = 19
'}, itude: 42.362530, longitude: -71.087936, info: 'Speed = 16
'}, itude: 42.362457, longitude: -71.087059, info: 'Speed = 16
'}atitude: 42.362385, longitude: -71.086182, info: 'Speed = 21
]

我查看了网上的勘误表,没有看到任何关于这件事的信息。我当时使用的是Cygwin,但后来尝试了linux,两者都有相同的结果。

如有任何帮助或见解,我们将不胜感激!