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    <p>Step 1 would be to get the latest conversion rate. You can use a web-service for that. There are many available. You can try <a href="http://www.webservicex.net/CurrencyConvertor.asmx?op=ConversionRate" rel="nofollow noreferrer">this</a>.</p> <p><strong>Request:</strong></p> <pre><code>GET /CurrencyConvertor.asmx/ConversionRate?FromCurrency=INR&amp;ToCurrency=USD HTTP/1.1 Host: www.webservicex.net </code></pre> <p><strong>Response:</strong></p> <pre><code>HTTP/1.1 200 OK Content-Type: text/xml; charset=utf-8 Content-Length: length &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;double xmlns="http://www.webserviceX.NET/"&gt;SOME_RATE_IN_DOUBLE&lt;/double&gt; </code></pre> <p>For sending the request you can make use of cURL.</p> <p>Once you have the response, just parse it to get the rate. Once you've the rate you can easily write the program to convert.</p> <p><strong>EDIT:</strong></p> <p>If using cURL is something you are not comfortable with you can make use of good old <code>system</code> and <code>wget</code>. For this you need to construct the URL first like:</p> <p><a href="http://www.webservicex.net/CurrencyConvertor.asmx/ConversionRate?FromCurrency=INR&amp;ToCurrency=USD" rel="nofollow noreferrer">www.webservicex.net/CurrencyConvertor.asmx/ConversionRate?FromCurrency=INR&amp;ToCurrency=USD</a></p> <p>then from the C program you can do:</p> <pre><code>char cmd[200]; char URL[] = "www.webservicex.net/CurrencyConvertor.asmx/ConversionRate?FromCurrency=INR&amp;ToCurrency=USD"; sprintf(cmd,"wget -O result.html '%s'",URL); // ensure the URL is in quotes. system(cmd); </code></pre> <p>After this the conversion rate is in the file <code>result.html</code> as XML. Just open it and parse it. </p> <p>If you are using windows, you need to install wget for windows if you don't have it. You can get it <a href="http://gnuwin32.sourceforge.net/packages/wget.htm" rel="nofollow noreferrer">here</a>.</p>
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    1. COHi.. thank you for your response and the solution... But i am getting some problem with this, when i run the above code i am getting error like below.(i am running on ubuntu) HTTP request sent, awaiting response... 500 Internal Server Error 2010-02-08 11:50:50 ERROR 500: Internal Server Error. (My net connection is proper) thank you...
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    2. COGanpati, my bad, you need to enclose the URL in quotes. I'll update my answer in a min.
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    3. COcodaddict, it is working superb... Thank you, very much :)
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