I am working with a computer that currently has no Internet access. I need to be able use use the CS50 library (it has functions like GetInt
and GetString) for my program. Do any of ya'll now the code behind those functions so I can add and declare the function in my code? Or maybe code that does the same thing that you don't need any other libraries?
Download the library from a computer with Internet access, save it to media that can be accessed from this computer that has no Internet access, and hence work around the lack of Internet access.
Alternatively, if you know what GetInt and GetString do, it may be feasible to just implement them using the facilities available in the C standard library.
Look up a C++ Reference and learn How To Ask Questions The Smart WayOriginally Posted by Bjarne Stroustrup (2000-10-14)
Ok. So when you say "save it to media" do you mean to download the CS50 folders and them put them in the right places on the other computer?
While I don't want to be presumptuous this sounds dangerously close to "hey kids, let's not bother learning the C language I/O and use the instructor's crap library to avoid all that ugly stuff." That's all hunky dory until you are asked to write a program in the real world and you can't use your instructor's crap library.
I hope this is not the case, but it's worth paying attention to what it is that you are being taught.
1. Get rid of gets(). Never ever ever use it again. Replace it with fgets() and use that instead.
2. Get rid of void main and replace it with int main(void) and return 0 at the end of the function.
3. Get rid of conio.h and other antiquated DOS crap headers.
4. Don't cast the return value of malloc, even if you always always always make sure that stdlib.h is included.
Haha. Don't worry... they are just using this library for the first couple weeks. CS50 is a class from Harvard. So they won't handicap you with custom libraries for long. This is what GetInt is doing... Does anyone know how to write this using the standard library? I looked up the code behind all of the functions in the cs50 library but could not find it. :/
- // Input Days
- short int days;
- while (days<28 || days > 31){
- printf("Days in the month: ");
- days = GetInt();
Well I am assuming that GetInt is probably reading an integer from the standard input (i.e. keyboard) and is validating that the input is actually an int. If the validation fails it either throws an error message or sets a flag or returns some invalid value. There is no way to tell what it is doing from your snippet.
1. Get rid of gets(). Never ever ever use it again. Replace it with fgets() and use that instead.
2. Get rid of void main and replace it with int main(void) and return 0 at the end of the function.
3. Get rid of conio.h and other antiquated DOS crap headers.
4. Don't cast the return value of malloc, even if you always always always make sure that stdlib.h is included.
Oh sorry. Your right. That is what it is doing.Can you do the same thing without using GetInt? I heard that is uses scanf to get a number from the user and store it I a variable.
Last edited by VEN0M; 07-25-2012 at 10:18 AM.
Of course. GetInt is not some magic that happens in the computer, it's a function. It's a function made up of a bunch of C commands. You could write a function of your own that behaves similarly/identically.
Yes, e.g., using a thumb drive, CD, DVD, portable hard disk drive, etc.
Yes, e.g., do the same thing that was done to implement GetInt.
Look up a C++ Reference and learn How To Ask Questions The Smart Way
Took me about 3-5 minutes to find the source code for the c50 library.
There is also an installation guide.
Time to improve your researching skills :-)
Bye, Andreas
Ok. Great. Does anyone know what the code behind GetInt means I heard that it uses scanf to get a number from the user and place it in a variable.
@Andi. I already saw that but as I said earlier I do not have Internet. It would be kind of difficult to run wget without an Internet connection.
@laser do you think I would get the same result by dragging and dropping folders as running this:
apt-get install gccwget http://mirror.cs50.net/library/c/cs50-library-c-3.1.zipunzip cs50-library-c-3.1.ziprm -f cs50-library-c-3.1.zipcd cs50-library-c-3.1gcc -c -ggdb -std=c99 cs50.c -o cs50.oar rcs libcs50.a cs50.ochmod 0644 cs50.h libcs50.amkdir -p /usr/local/includechmod 0755 /usr/local/includemv -f cs50.h /usr/local/includemkdir -p /usr/local/libchmod 0755 /usr/local/libmv -f libcs50.a /usr/local/libcd ..rm -rf cs50-library-c-3.1
It looks pretty complicated but that might just be me.
Have you already completed the CS50 curriculum? I presume that at some point in the class, you will learn how to implement GetInt. If not, it is time to start searching for new learning material to advance your knowledge. Asking us to explain "the code behind GetInt" when you apparently have not looked at it yet (hence the "I heard") is kind of presumptuous.
Look up a C++ Reference and learn How To Ask Questions The Smart Way
I have tried to find the code behind it but it is not posted anywhere. When I said "I heard" I was saying that because one of the teachers said something on the lines if "GetInt basically uses scanf to take and print input from the user." No, I have not finished the course, if I had then you would not be reading this post.
Last edited by VEN0M; 07-25-2012 at 10:31 AM.
