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Your pointer doesn't point anywhere meaningful. Allocate some memory to it first. Also, there's a different getline for C-style strings that's a member function of cin.

Closed. Continue here:

http://www.daniweb.com/software-development/cpp/threads/477274/creating-a-tune

Please do not create a new topic with the same question; this can be classed as spam and your question will be deleted.

What you are doing here is using the same array, which, in tern most likely segment and thus time out.

Try, something like the following:

  for(int n = 0; n < num_samples; n++) //where n is the step |start of for loop
  {
     int fr = 523;          //Frequency A  
     data[n] = amp*sin(2*pi*fr*n/fs);  
     cout << n << "\t" << data <<"\n"; 

     int fre = 587;       //Frequency B  
     data[n] = amp*sin(2*pi*fre*n/fs);  
     cout << n << "\t" << data <<"\n"; 
   }

But, even this would not work. Why won't it work? Simply because your structure has to be like this:

|one tone| -> -> -> |two tone|

If you take a look at the code sample that I give you, using vectors, I created 2 vectors which stored the two tones, then, having a separate vector which concatenated the data series. This is what you need to use.

My best advice would be to sit down and really think about this problem; what you're trying to do in C++ is not for the average user, you should have atleast some experience in arrays, and, data structure before you begin tackling this problem.

P.S. num_samples will need to be double the size of the array that you have.. If size is currently 512, it would be 512*512

Maybe you need admin permissions to do that. Move the pdf file somewhere else such as c:\temp and see if the problem goes away.

So, as I said in my first post. If you increase the total number of n values, then, you would therefore increase the total size of the audio file.. n < 256 > 1024 That being said. You could (as a test) have two different loops that write to two different arrays and then concatenate these two arrays before writing them to the .wav file.

Let me know how you get on

Try reading this: http://debbiebaker.wikispaces.com/file/view/example04_annotations_e.pdf/437832792/example04_annotations_e.pdf

You might understand how things work better.

i've declared pointer to char for getting input but i'm unable to get input using getline in this case :

char* str;
cout<<"enter string";
getline(cin,str);

its not working however i solved the issue using the following code(but i want that why the above code is not working)

string str;
cout<<"enter string";
getline(cin,str);

i want to know about this (char*) for getting input.

* We create a list of one character strings, which are the button labels and numbers or operations at the same time. 
line 6-11
* We start a loop on button label elements. We interpret an index of a button label element as a row, column index. row= index//4+1 column=index%4
line 13-15, line 19-21, 
* In this loop for each element **begin**
* We create a button, with the following attributes 
    * the actual label element as text 
line 17 text=buttons
    * a function call with the actual label element as a parameter (function not explained here)
line 16 and line 17 'command=cmd '
    * we set the button's grid, to place the button to row and column
line 17 '.grid(row=r, column=c)'
* In this loop for each element **end**
* We create an entry widget  on the first (0th) row and make it span 4 column.
line 22-23

Would you mind being one?

romdan doesn't seem to have contributed to his homework discussion at all, so it would be a pity to post a complete solution for him to copy and get the credit for.
Equally it would be a pity to deprive you of some constructive feedback. Maybe PM it to a few suitable candidates and ask for feedback?

I programmed this myself as a challenge, could someone check it over to see if all the requirements were met?
Should I post it in a new Thread and link it here?

#the following will copy any dll files in my_file.txt from
#C:\Windows\Sytem32 to C:\Tools
import os
import shutil

sourcedir = "C:\\Windows\\System32"

source = os.listdir(sourcedir)

destination = "C:\\Tools"  

dllmatch = open("my_file.txt", "r")    # may need full path here

matchf = dllmatch.readlines()

for i in range(0,len(matchf)):
    if matchf[i][-1] == "\n":
        matchf[i] = matchf[i][:-1]    # :-1 to strip off \n

for files in source:
    if files in matchf:
        if os.path.splitext(files)[1] == ".dll":
            shutil.copy(os.path.join(sourcedir,files),destination)