Hi Im pretty new to the whole C++ programming language but after learning python and java i decided to give it a go. I have been using tutorials at www.cplusplus.com and that has been working fine but i came across a bit of code today i couldn't understand. It went like this:
// example about structures
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
struct movies_t {
string title;
int year;
} mine, yours;
void printmovie (movies_t movie);
int main ()
{
string mystr;
mine.title = "2001 A Space Odyssey";
mine.year = 1968;
cout << "Enter title: ";
getline (cin,yours.title);
cout << "Enter year: ";
getline (cin,mystr);
stringstream(mystr) >> yours.year;
cout << "My favorite movie is:\n ";
printmovie (mine);
cout << "And yours is:\n ";
printmovie (yours);
return 0;
}
void printmovie (movies_t movie)
{
cout << movie.title;
cout << " (" << movie.year << ")\n";
}
My problem is where is goes void printmovie (movies_t movie); and there is nothing after it and then later in the program is does the same thing again but this time there is an actual function defined. My question is, why would the person who made this have put that void printmovie (movies_t movie); without having any actual code defined until way later in the program. Thanks. :)
Wow vega, thats brilliant. I never thought of doing things like that. Thanks a lot, i have the rather large task in front of me that is understanding the whole thing. So thanks again, i think thats all i need.
Just a tip. If you want other people to be able to play this game you need to fix a few things. The one that instantly comes to mind is that you spell beggar like "begger" when the actuall spelling is beggar. For this reason some people will find it more difficult to play your game.
and the problem is on line 467. There you say
if prompt == 'look around' or 'look':
#do stuff
The problem is that python will check if prompt is equal to "look around" and then for the next one is does not check if prompt is equal to look. If you wanted this to work then you would have to go
if prompt == "look around" or prompt == "look":
Cause at the moment it checks the first statement and it returns false because prompt does not equal "look around" but then seeing there is nothing being compared to "look" the program returns True becuase "Look" is not an empty string and therefore returns true in the case of an if statement when nothing is being compared.
What functions dont work? I mean there are a lot of functions you need to be a bit more specific then to just say my functions dont work. Do all of them not work, or just one or two?
Hi I have been mucking around with VPython for a bit now and i can use it for basic 3D Python but i have not yet worked out how to do things that arent the usual, add square, add arrow, add sphere.
So i was wondering if it was even possible to do things in VPython such as importing 3D models that you could use as a world terrain or even just adding textures to things like the square and circle? Either of those would be really nice.
Have you had a look at the wx.ProgressBar? Becuase in the Docs and Demos they show a way to do just that. You might have to decipher the un-needed code though.
the asterix means a parameter that will catch all parameters that arent used in the first ones (if there are any) and all the left over parameters that are given to the method are then made into a list. For a reference see here: http://www.pasteur.fr/recherche/unites/sis/formation/python/ch06s06.html
Hi i have been spending the last few days deciding on an IDE that would let me program in Java, C++ and python and notepad++ looked pretty good. The only issue is i cant work out how to make the program run once i have made it. I looked in google and i couldn't find any tutorials to set it for python but if anyone could help that would be greatly appreciated. Thanks!
The problem is that loop1 exists in two places. In the global scope and in the function scope. This means that the loop1 in the function is different to the loop1 in the main body. To get around this you can add global loop1 to your program.
that just makes sure the program knows where to look to find the variables. So if more than one thing was in the formatted string you would use a tuple.
Code similar to that seen above can be used to create custom exceptions and pass information along with them. This can be extremely useful when trying to debug complicated projects. Here is how that code would look; first creating the custom exception class:
class CustomException(Exception):
def __init__(self, value):
self.parameter = value
def __str__(self):
return repr(self.parameter)
Hi I have fiddled around with other GUI's such as pygame and wxPython but i wanted to use something a little more powerful when it came to 3D objects and i saw what PyOpenGl can do. But i spent ages looking for any help but i couldn't find any place that had a beginners tutorial in PyOpenGl. I was wondering if anyone on DaniWeb knew where i could find some. Thanks
wait im wrong. Sorry didnt read it properly! But i did have a quick go and this works:
def line_sum_and_count(line):
"""Finds the sum and count of the numbers in the given line of text."""
#-----------------------------------------------------
split = line.split()
count = 0
sum=0
for f in split:
count+=1
sum += float(f)
#-------------------------------------------------------
return sum, count
def test_line_sum_and_count():
"""Tester for the above function """
sum, count = line_sum_and_count('14.0 20.0 17')
if sum == 51 and count == 3:
print "passed"
else:
print "failed"
test_line_sum_and_count()
The reason it will say failed at the end of the code is becuase sum and count only exist inside your method. To stop that you can add global sum and global count to the start of the code.
Has anyone heard of happy numbers? Well wikipedia says this about them:
Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers, while those that do not end in 1 are unhappy numbers.
It is just found in the wxPython demo so it might be a custom thing. I noticed it was to open a file. But when i replaced this:
text = opj('data.xrc')
with this:
text= open('data.xrc')
It gave me some sort of error where is said it wanted a string or unicode object not a file. So is there any way to open an object (file) and make it a string.
What i want to do with this is have wxPython read from xml files and make a GUI from that. It is in the Demo so i just wanted to do it myself. If you have any pointers for that as well that would be good. Thanks!
Hi My problem today is i have opened up the wxPython Demo and copied one of the pieces of code across to IDLE so i can have a fiddle with it. My problem is that at the start it goes from Main import opj . Thats what stuffs it up. The interpreter goes something like this:
Traceback (most recent call last):
File "<pyshell#7>", line 1, in <module>
from Main import opj
ImportError: No module named Main
Yeah i definitly agree with steve. Cause what is happening at the moment is that your program makes a BoxSizer and then you instantly overwrite it with a FlexSizer so i would reccomend you get rid of one of them really im just echoing steves words but they are very true.
