尝试验证它的存在后,新行切除不工作 [英] Newline removal not working after trying to verify it exists
问题描述
我想提出一个code解析一些输入数据,并在一个特殊的格式写入文件。我从每个字符串删除换行符令牌像这样:
令牌[strlen的(标记)-2] ='\\ 0'
是 -2
因为最后一个元素 \\ 0
。这么多的作品。然而,输入数据的最后一个元件不具有换行,所以仅使用该最终除去从最后输入集中的第二到最后一个字符。
原始输入:0.38
通过消除运行之后:0.3
显而易见的解决方案是,以检查是否新行是有去除之前。我这样做:
如果(令牌[strlen的(标记)-2] =='\\ n')令牌[strlen的(标记)-2] ='\\ 0';
然而,加入if子句后,换行不再删除!我究竟做错了什么?从整个code SNIPPIT:
,而((标记= strsep(安培;!行,))= NULL){
如果(X ++ == 1){
FWRITE(<项目> \\ N,11,1,FW);
FWRITE(<名称>,14,1,FW);
FWRITE(令牌,strlen的(标记),1,FW);
FWRITE(< /名称> \\ N,8,1,FW);
}
否则如果(ISDIGIT(令牌[0])){
如果(令牌[strlen的(标记)-2] =='\\ n')令牌[strlen的(标记)-2] ='\\ 0';
FWRITE(< SPC>中,13,1,FW);
FWRITE(令牌,strlen的(标记),1,FW);
FWRITE(< / SPC> \\ N,7,1,FW);
FWRITE(< /项目> \\ N,12,1,FW);
}
}
您换行应该是行[strlen的(线)-1]
,但你可能下工作Windows其中一个换行实际上是由一个回车跟一个换行符。这可以解释为什么行[strlen的(线)-2] ='\\ 0'
成功在去除结束线,但测试失败。
I am making a code to parse some input data and write it to a file in a special formatting. I am removing a newline from each string token as so:
token[strlen(token)-2] ='\0'
It is -2
because the last element is \0
. This much works. However, the final element of the input data does NOT have a newline, so using just that ends up removing the second-to-last character from the last input set.
original input: 0.38
after running it through the removal: 0.3
The obvious solution is to check if the newline is there before removing. I do this:
if(token[strlen(token)-2] =='\n') token[strlen(token)-2] ='\0';
However, after adding the if clause, the newline is no longer removed! What am i doing wrong? Snippit from the whole code:
while((token = strsep(&line, ",")) != NULL){
if(x++ == 1){
fwrite(" <item>\n", 11, 1, fw);
fwrite(" <name>", 14, 1, fw);
fwrite(token, strlen(token), 1, fw);
fwrite("</name>\n", 8, 1, fw);
}
else if(isdigit(token[0])) {
if(token[strlen(token)-2] =='\n') token[strlen(token)-2] ='\0';
fwrite(" <SPC>", 13, 1, fw);
fwrite(token, strlen(token), 1, fw);
fwrite("</SPC>\n", 7, 1, fw);
fwrite(" </item>\n", 12, 1, fw);
}
}
Your newline should be at line[strlen(line)-1]
, but you may work under Windows where a newline actually consists of a carriage return followed by a newline. This would explain why line[strlen(line)-2]='\0'
is successful in removing the end-of-line, but the test fails.
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