How To Create PDF Online?
Easy-to-use PDF software
Which language should I learn to create Windows PC software (exe file) like cleaning software or pdf viewer?
Because there is more and different information in the source code than in the compiled executable code. EXAMPLE 1 Here is a simple real-life example. I have a short Plain English program where this source-code statement… Beep. …compiles to these 40 bits. 1110100000101110000000000000000000000000 …which, in hexadecimal, look like this. E82E000000 now if we disassemble those nibbles, we will find that t correspond to this Intel x86 assembler statement… call 0x33 …which, in the context of the rest of the file, is the correct call BUT, as you can plainly see, says nothing at all about the original Plain English representation, which was… Beep. …because the name of the routine and the period (which are helpful to the human programmer) are not needed by the machine in the executable code. EXAMPLE 2 Perhaps a little more detail regarding the translation from source code to executable code will help. This time we start with a simple program (that, while small, includes sequence, a conditional statement, a loop, internal calls, an external call to the operating system, and hand-written machine code), shown here in the Plain English editor. Then we look in the Plain English library of general-purpose types, variables and routines to see, for instance, what “Buzz” does, and we find this… …which is a call to the operating system. Then we check out, in the same library, how a number is compared to another number… …and how a number is subtracted from another number… …and we’re at the machine code level. Then we use the “List” command to see what the compiler was thinking, and when we open up the listing file in the Plain English editor, we find this… …which shows us how the parameters are pushed and the calls are made and how the conditional statement and the loop are handled — the machine code shown at the right of each fragment. Then we open up the generated, stand-alone executable file in the Plain English dumper to see that code in context in the “.exe” file. You can see (in the ASCII interpretation of those byes on the right) that there is almost nothing that looks like the original source code… …in that executable file. Sure, there are some 3’s and 0’s and 1’s, and some Intel x86 “op codes” that could be translated back into words like “subtract” and “repeat”, but no trace of the words “buzz” and “times” and “the” remain — those words were meaningful to the programmer, but are not required for the program to run. Besides, the same program written in another programming language like C, for example, might produce an identical executable file from very different source code statements — how, then, would the reverse compiler know to use “-” instead of “subtract,” or to insert a word like “while” or “for” that does not appear in the Plain English version? CONCLUSION That’s why reverse compilers cannot perfectly reconstruct source code. In short. Et voila!
PDF documents can be cumbersome to edit, especially when you need to change the text or sign a form. However, working with PDFs is made beyond-easy and highly productive with the right tool.
How to Create PDF with minimal effort on your side:
- Add the document you want to edit — choose any convenient way to do so.
- Type, replace, or delete text anywhere in your PDF.
- Improve your text’s clarity by annotating it: add sticky notes, comments, or text blogs; black out or highlight the text.
- Add fillable fields (name, date, signature, formulas, etc.) to collect information or signatures from the receiving parties quickly.
- Assign each field to a specific recipient and set the filling order as you Create PDF.
- Prevent third parties from claiming credit for your document by adding a watermark.
- Password-protect your PDF with sensitive information.
- Notarize documents online or submit your reports.
- Save the completed document in any format you need.
The solution offers a vast space for experiments. Give it a try now and see for yourself. Create PDF with ease and take advantage of the whole suite of editing features.
Create PDF: All You Need to Know
I have explained an interesting topic that, by now, most readers should hopefully have an intuitive grasp of. If you don't know what the “machine’ code’ means, then don't blame me for not explaining it. One final thing to say about the topic. Let me put some meat on the bones: The source code was not readable. Even today, almost forty years later, if I wanted to look at the code of a real-life program written in any language, I would need to go through and find my way to the source file with a text editor. But, when I looked at the source of a reverse-compilation program for LOS (a popular computer language used to implement the OSI Model), I got a bunch of code files. I had a feeling then (even though it isn’t true now) that the original source files were so huge.