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Thanks. Yeah, I meant


f(Y, A, sz);


Can you actually allocate space for Y through the call to f(), though? Y is initialized in main() but no space is allocated before f() is called. Does the...

File allocate.c:



void f(double **X, int *A, size_t sz) {

/* ... */

X = malloc (sz * sizeof(double *));

Suppose a function f takes pointer to pointer to double A. B is a variable of the same type (declared in main() ). How do you (i) allocate space to A in f() and (ii) modify the contents of B via f()?...

Is there a way to get a function to know about the size of an array passed to it without explicitly passing its size?



type f(type *a, size_t sz) { /* ... */}

type f(type *a) { /*...

Suppose S is a structure:


typedef struct {

type s1;
type s2;
// ...
type sn;
} S;

Thanks. I changed the following lines


inline void endian_swap(unsigned int& x) {
// ...
unsigned int * v = new unsigned int[1];
//...
GCA.read(reinterpret_cast<char*>(v), sizeof(unsigned...

I'm trying to swap endianness in a big-endian file: my platform is little-endian, and so things are coming out wierd:



#include <iostream>
#include <fstream>

using namespace std;

//...

Thanks!

I already have the software (and the domain), but have no idea about where to put everything. We're getting a new machine soon, and I was wondering if that could act as the server (see...

What kind of resources do you need to start your own online forum? I tried godaddy.com and thought about purchasing enough storage space for ~1000 email accounts, but I'm not sure if this the most...

Is this a good way to use a namespace?



#include <iostream>

namespace Hw { void hello(); }
void Hw::hello() { using namespace std; cout << "Hello, world.\n"; }

int main() { Hw::hello();}

Thanks, Codeplug. The function works now, but it's very sloppy, and the goal is efficiency (which is why numeric containers were used in the first place). Would inlining or recursion be reasonable...

`cake' represents a 5-by-5 matrix. How would you do a row-wise addition on `cake'? I tried slicing `cake' and adding the slices, but things like state = cake[l1] + ... + cake[l5];
are illegal, and...

Thanks!

Thanks for your help!

I traced the problem to the way values are assigned to an array in a structure:



#include <iostream>
#include <vector>
#include <string>
#include <cstdlib>

But doesn't ra++ move the pointer up by sizeof(int)? I thought &ra[0] points to the zeroth element (always), and ra is the current position. Does ra++ move &ra[0] up too? Why?

Why does the address &ra[0] keep changing?




void overlappingPermutations(Distribution& D, int* ra) {

// overlappingPermutations
//
// Take five consecutively-generated RNs at...

What about just generating messages that are grammatically correct? A combination like

"97xj34m725"

probably wouldn't occur in a plaintext message....

Also:

If the key is shorter than...

(See Stroustrup, The C++ Programming Language (3rd ed.), p. 164).

How would you help decrypt messages encrypted using the OTP algorithm?

I'm able to encrypt messages alright using XOR:


...

Thanks!

I played around with two different gap sequences (Sedgewick, Pratt) , but didn't bother to generate enough randoms to see an appreciable difference in each.



int[] sedge = {1391376,...

Thanks all! It works, and the code is much cleaner.

Now I have to go backward( ) ; )

Thanks, but I still have the same problem : (

The ciphertext is almost identical to the message:



#include <iostream>
#include <string>
using namespace std;

#define DEBUG

Here's a complete implementation taken (verbatim) from Stroustrup (The C++ Programming Language, 3rd ed., p. 158; comments added).

`cmp' is a comparison function (defined elsewhere).

How would...

Oh.

Thanks! It's working fine now.

Oops, sorry.

The "such a pointer" is

"a pointer to a function taking arguments of type pointer to character and reference to integer and returning no value"

which is a