了解C中的文件处理 [英] Understanding of file handling in C

问题描述

执行某些操作。什么是分配文件指针的语法
假设该文件位于C：\Acads\bin\File.txt。
在我的代码中，当我尝试这个

  FILE * fp1; 
 fp1 =（C：\Acads\bin\File.txt，r +）; 
  

最终给我一个错误。

更新：
好​​的，这里是我的主要疑问。

编译器，我的文件位于某某路径。
我已经尝试了你们告诉我的所有事情，但无济于事。 一个错字：应该说：

pre $ fp1 = fopen（filename，r +）;

另外，您必须将每个反斜线char \ 与另一个反斜杠：

  fp1 = fopen（C：\\Acads\\bin\\\ \\File.txt， R +）; 
  

这是因为 \ 转义序列。例如： \\\
将意味着一个换行符。 \\ 扩展为简单的反斜杠。

How exactly do I take an input from a file in C?

As in, for instance: Say i assigned a file pointer to a particular file and want to peform certain operations. What exactly is the syntax for assigning the file pointer Assume the file, is located at C:\Acads\bin\File.txt. In my code when I try this

FILE *fp1;
fp1=("C:\Acads\bin\File.txt","r+");

It ends up giving me an error.

UPDATE: Okay so here is my main doubt.

How exactly do i tell the compiler that my file is located at so and so path. I've tried doing everything you guys have told me but to no avail.

解决方案

I think you ran into a typo: It should say:

fp1=fopen(filename,"r+");

Also you have to escape each backslash char \ with another backslash:

fp1=fopen("C:\\Acads\\bin\\File.txt","r+");

This is because the \ begins an escape sequence. E.g: \n would mean a newline. \\ is expanded to a simple backslash.

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