forked from aaronbloomfield/pdr
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathfileio2.cpp.html
49 lines (46 loc) · 4.23 KB
/
fileio2.cpp.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="GENERATOR" content="GNU source-highlight 3.1.6
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite">
<title>fileio2.cpp</title>
</head>
<body bgcolor="white">
<pre><tt><i><font color="#9A1900">// This program shows how C-based file I/O works. It will open a</font></i>
<i><font color="#9A1900">// file, read in the first two strings, and print them to the screen.</font></i>
<i><font color="#9A1900">// included so we can use cout</font></i>
<b><font color="#000080">#include</font></b> <font color="#FF0000"><iostream></font>
<b><font color="#000080">#include</font></b> <font color="#FF0000"><fstream></font>
<b><font color="#000080">#include</font></b> <font color="#FF0000"><stdlib.h></font>
<b><font color="#0000FF">using</font></b> <b><font color="#0000FF">namespace</font></b> std<font color="#990000">;</font>
<i><font color="#9A1900">// we want to use parameters</font></i>
<font color="#009900">int</font> <b><font color="#000000">main</font></b> <font color="#990000">(</font><font color="#009900">int</font> argc<font color="#990000">,</font> <font color="#009900">char</font> <font color="#990000">**</font>argv<font color="#990000">)</font> <font color="#FF0000">{</font>
<i><font color="#9A1900">// verify the correct number of parameters</font></i>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font> argc <font color="#990000">!=</font> <font color="#993399">2</font> <font color="#990000">)</font> <font color="#FF0000">{</font>
cout <font color="#990000"><<</font> <font color="#FF0000">"Must supply the input file name as the one and only parameter"</font> <font color="#990000"><<</font> endl<font color="#990000">;</font>
<b><font color="#000000">exit</font></b><font color="#990000">(</font><font color="#993399">1</font><font color="#990000">);</font>
<font color="#FF0000">}</font>
<i><font color="#9A1900">// attempt to open the supplied file</font></i>
<font color="#008080">ifstream</font> <b><font color="#000000">file</font></b><font color="#990000">(</font>argv<font color="#990000">[</font><font color="#993399">1</font><font color="#990000">],</font> ifstream<font color="#990000">::</font>binary<font color="#990000">);</font>
<i><font color="#9A1900">// report any problems opening the file and then exit</font></i>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font> <font color="#990000">!</font>file<font color="#990000">.</font><b><font color="#000000">is_open</font></b><font color="#990000">()</font> <font color="#990000">)</font> <font color="#FF0000">{</font>
cout <font color="#990000"><<</font> <font color="#FF0000">"Unable to open file '"</font> <font color="#990000"><<</font> argv<font color="#990000">[</font><font color="#993399">1</font><font color="#990000">]</font> <font color="#990000"><<</font> <font color="#FF0000">"'."</font> <font color="#990000"><<</font> endl<font color="#990000">;</font>
<b><font color="#000000">exit</font></b><font color="#990000">(</font><font color="#993399">2</font><font color="#990000">);</font>
<font color="#FF0000">}</font>
<i><font color="#9A1900">// read in two strings</font></i>
<font color="#008080">string</font> s1<font color="#990000">,</font> s2<font color="#990000">;</font>
file <font color="#990000">>></font> s1<font color="#990000">;</font>
file <font color="#990000">>></font> s2<font color="#990000">;</font>
<i><font color="#9A1900">// output those strings</font></i>
cout <font color="#990000"><<</font> s1 <font color="#990000"><<</font> endl<font color="#990000">;</font>
cout <font color="#990000"><<</font> s2 <font color="#990000"><<</font> endl<font color="#990000">;</font>
<i><font color="#9A1900">// string comparison done with ==, but not shown here</font></i>
<i><font color="#9A1900">// close the file before exiting</font></i>
file<font color="#990000">.</font><b><font color="#000000">close</font></b><font color="#990000">();</font>
<font color="#FF0000">}</font>
</tt></pre>
</body>
</html>