URL Encoding When data is entered on a Web page form, it must be encoded before it can be passed to some program for processing. Each element on the form has a name (key), and a value. Data is represented by a key-value pair. For example, a field representing age with a value of 30, would appear in the input stream as: age=30

URL Encoding Rules Each key-value pair is separated by the ampersand (&) character. Spaces are replaced with the plus sign (+) character. All other special characters are replaced with their hexadecimal equivalent, in the form %nn. A response of 01/22/2001 for today’s date would be: today=01%2F22%2F2001 since %2F is the hexadecimal equivalent of the slash (/) character.

Write a C++ program to parse a character string, as received from a web browser, into its component parts. Following is a sample form, the resulting encoded string, and the desired output. You should label and split the key-value pairs as shown. Assume you have the character string available in a file called testData.txt. Don’t worry about the form itself, it is just for reference. Don’t worry about the names of the elements (the keys) I used T1,T2,T3,S1,S2,S3 and B1 in my example. This is simply a character string processing problem. All you need to know are the encoding rules!

9898&S1=CIS111%2C+CIS115+%28The+Internet%29%2C+M AT100&S2=I+need+it+for+my+degree.&S3=I+am+intere sted+in+anything+to+do+with+the+Internet%21%21%0 D%0AWill+there+be+many+programs+to+write+in+this +course%3F&B1=Submit testData.txt (This is what is passed to the parsing program)

field name: T1 field content: A New Student field name: T3 field content: field name: T2 field content: field name: S1 field content: CIS111, CIS115 (The Internet), MAT100 field name: S2 field content: I need it for my degree. field name: S3 field content: I am interested in anything to do with the Internet!! Will there be many programs to write in this course? field name: B1 field content: Submit Press any key to continue