A student approached me and asked why his prime checker wouldn't work. I took a look and it should work, imo, for all < 64 bit inputs.
Code:
int isitprime(unsigned long long in) {
unsigned long long c;
unsigned long long max = sqrt(in);
if(in <= 1 )
[Code] .....
checked for a bunch of primes i could think of 0,1,2,3,4,5,6,7 up to 18446744073709551557, which is supposed to be one of the largest 64 bit primes. Worked.
I'm making a text editor for my own programming language and I wanna make a simple software updater for it.
View 4 Replies View RelatedI'm doing a project through college which is a diagnostic and support tool for Windows OS's. The application at the moment has a simple expert system which is a Combobox with strings that relate to common PC problems. Then those strings are put through a switch statement and relevant commands are shown to fix the problem i.e. "My printer is not working" will disable all buttons except for printer management, spooler folder etc.
My supervisor who marks my project has said this isnt good enough and wants a more layered hierarchy approach so he's looking for 3-4 groupboxes with tickboxes inside them and users tick the boxes that relate to their problem which will give the functions to support. The only way I can see to do this at the moment is a massive nested switch statement that is really not worth the time. There are 60+ functions in my program so you can imagine how long the switch would be trying to pick and iterate through all of the possible answers.
I'm just trying to figuire out an easier way to do this, rather than a massive switch statement. Something like WebMD which has 4-5 tick boxes and can give out the same answer for different symptoms.
I've attached a Flow Chart I made of the hierarchy Im trying to go for [URL] .....
I am programming a simple spell checker which checks if words match in a given dictionary.
The user first enters the words from the dictionary and then the words to check. I have comments in my code that explain how this is done.
The catch for the checking is: I cannot use functions like strcmp or even functions I made myself. For input and output I will also only use getchar and putchar.
Where I am stuck: I have a concept of how to check and compare the words with the dictionary, but this way the looping is extremely confusing (at least in my mind) and I cannot make a functioning one. The concept for this is in the comments of the code.
Here is what I've got so far.
The user enters aaa bb bbaa;abc aaa aa.
The output should be: *abc* aaa *aa*.
Since abc and aa does not match the dictionary on the left, but aaa does.
Also, words can have a max length of 4.
#include <stdio.h>
int main() {
char dictionary[40];
char words[40];
char both[80];
[Code] .....
I have a program that gets prime numbers that doesn't work. It looks like it works for all prime numbers except odd non-prime ones. Here is the code:
Code:
#include <iostream>
using namespace std;
bool isPrime(int prime) {
while(true) {
int track = 0;
[Code] ...
I have this piece of code from the book "Modern C++ Design" that checks for compile-time error. When i tried to compile it, i get the error "invalid application of size of to function type". How to make this compiler-time checker work?
Code:
template<bool> struct CompileTimeChecker{
CompileTimeChecker(...);
};
template<> struct CompileTimeChecker<false> {};
[Code] .....
Over the last few days, I've been trying to implement a spell checker in c++ that checks if the inputted word is in the dictionary file on my computer. However, as I'm nearing completion of the project, I keep running into more and more errors, some of which I do not understand. My program is complete, albeit, with some minor bad practices (I hard coded a few things just to get the program up and running.For some reason, everything works well until I output spelling suggestions. I type in "mses" (attempting to spell mess) and it returns some strange characters. It does definitely recognize that there are two permutations that match words in the dictionary (however they are both mess due to the algorithm implemented), and I don't understand why? I will work on removing the duplicates after.
// Spell Checker.cpp : Defines the entry point for the console application.//
#include "stdafx.h"
#include <stdio.h>
#include <string>
#include <stdlib.h>
#include <fstream>
#include <iostream>
[Code] .....
I'm a new coder for C++, and I've recently learned java before starting this programming language. I'm attempting to find all prime numbers up to the number a user enters (i.e. User enters 10, System shows "1,2,3,5,7"),
#include <iostream>
#include <cstdlib>
using namespace std;
int main(int argc, char** argv) {
int num;
cout << "Enter a positive number." << endl;
[Code] ....
I've been looking at my forloop, and I can't seem to pinpoint the problem with it.
I wrote a program which sends a starting and ending range to other processes and the processes calculate the prime numbers in that range and return the count of prime numbers to the head process, process 0. But this is not working properly at the moment. I realize I still have to split up the range based on how many processes I have...I still have not figured out how I want to set that up. I
Code:
#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>
int isPrime(int num);
int main(int argc, char **argv){
}
[code]....
I've just started learning from "Jumping into C++". Great book. Unfortunately, I've also encountered my first snag. Practice problem number 3 from chapter 4 tells me to make a small calculator that takes one of the four arithmetic operations and its two arguments as input and give the result as output. Here's what my newbie mind came up with:
Code:
#include <iostream>
#include <string>
using namespace std;
int main()
[Code] .....
The thing that I don't get is why doesn't the function "getline" work. It's worked in previous programs. The program seems to work if I simply replace getline with a simple "cin". I could easily use that as a cheap fix but I am interested in knowing why "getline" refuses to work anymore....
what I do I cannot get a division to work:
Code:
//END RANGE INPUT
long double End;
printf("
Please enter the start of the range (Lower Bound):
");
[Code]...
No matter what I input for the values of 'Start', 'End' and 'Interval', the value of 'SizeL' always seems to be -2.
I am writing a simple console-based tic-tac-toe game. I am trying to write a function to check whether someone has won the game.
The board data is saved in an array called board: Code: int board[3][3] with each element corresponding either to an empty spot, an X, or an O, using the numbers 0, 1, and 2, respectively. For clarity:
Code:
#define EMPTY 0
#define X 1
#define O 2 Here is my function: Code: int check_state(int board[3][3]) {
int winner = 0;
[Code].....
I just dont see what the issue is here. I have stared at this thing forever. Im trying to make a calendar from scratch so I can be prepared for my second test on Friday.
Code:
#include<stdio.h>
#include<stdlib.h>
int main(void)
{
int i, n, s;
[Code]....
Assuming that we have the string :
Code:
***HELLO&SIR. & and * is the delimiters.
My question is how strtok will work in the beginning?
According to this to determine the beginning and the end of a token, the function first scans from the starting location for the first character not contained in delimiters (which becomes the beginning of the token). And then scans starting from this beginning of the token for the first character contained in delimiters, which becomes the end of the token. The scan also stops if the terminating null character is found.
This end of the token is automatically replaced by a null-character, and the beginning of the token is returned by the function. strtok will replace the first * with '' and the next call will start from the second * puts '' there and again the same with the third * ?
I am unable to get the string seaching function to work. it always says "Nothing found" I am stumped.
Code:
#include <stdio.h>
#include <string.h>
char tracks[][80] = {
"I left my Heart at Harvard Medical School",
"Newark, Newark, You suck balls",
"Dancing with a dork",
"From Here to maternity",
"The Girl from Iwo Jima",
[Code]....
how the -bounds annotations work, and I came up with the following test program.The alloc_char function ensures maxRead/ maxSet(str) == len. This is, in turn, ensured by malloc and memset (see the comments; I found this in /usr/share/splint/lib/standard.h), but SPLint doesn't recognize that.However, SPLint correctly sees that requires maxRead(str) >= i is fulfilled in main.
Code:
/*
* splint -strict
*/
#include
#include
#include
#include
}
[code]....
(Of course the main function is contrived and I could use puts instead, but that's not the point. The point is to make it see that i is not out of bounds.)I have struggled with -bounds for a very long time. Earlier I gave up and used -likelybounds instead. But now I have written a library which is annotated for splint -strict with -likelybounds, and I want people to be able to use it with the full -bounds checks. I can't get those ensures and requires annotations for maxRead/Set to work.
I have a program that spawns a number of threads. Each thread generates a table of output. During the time that it is creating this output, I don't want the other threads to be outputting, so I've attempted to create a mutex semaphore to allow only one thread at time to ouput.
Code:
sem_t mutex;
void* node(void *thread_arg) {
// set a mutex lock to allow the output for this next step to complete for this thread
sem_wait(&mutex);
// generate table with various fprintf statements
}
[code]....
This approach isn't working.
puts(pd) does not give any output in the below code. Also, the first puts(ps) does give an output, but the second puts(ps) after "while" does not give any output.
Code:
#include <stdio.h>
int main()
{
char source[50]="Alice has apples.";
char destination[60];
char *pd, *ps;
}
[code].....
I have an issue getting boost libraries to work with QT IDE. Here are relevant lines from my .pro file...
INCLUDEPATH += c:/users/bob/desktop/boost_1_53_0/
LIBS += -LC:c:/users/bob/desktop/boost_1_53_0/stage/lib64
After adding #include <boost/filesystem.hpp> I get error...
C:UsersobDesktopqtpuntitled5mainwindow.cpp:3: error: C1083: Cannot open include file: 'boost/filesystem.hpp': No such file or directory
The IDE does not highlight the line. The error only appears on compilation.
I want to access the body of the Add() of a list in c# to see how it works, but it only just gives me the declaration.
[DebuggerTypeProxy(typeof (Mscorlib_CollectionDebugView<>))]
[DebuggerDisplay("Count = {Count}")]
[Serializable]
public class List<T> : IList<T>, ICollection<T>, IList, ICollection, IReadOnlyList<T>, IReadOnlyCollection<T>, IEnumerable<T>, IEnumerable {
public void Add(T item); // thats all. I tried go to declaration but still gives me this line of code. This is from metadata in Visual studio.
}
How this thing work. It just a declaration not a definition yet its still doing something. How is that possible.
#include <iostream>
#include <string>
using namespace std ;
int main() {
string bored ;
do {
cout << " program" <<endl ;
[Code] .....
I made this as a simple do/while program, and if i run it, the second do/while statement will keep on going forever, without the [cin >> bored;] line working?
I am making a calculator where I will input 5 array of numbers and calculate those numbers with pointers or whatever you call it. I am getting an error like
note C:Dev-Cppincludec++3.4.2itsostream.tcc:63 candidates are: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>&(*)(std::basic_ostream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
and more error if I try to fix the code. So yeah, can i have a hand?
Btw, here's my code.
#include <iostream.h>
#include <conio.h>
#include <stdio.h>
using namespace std;
// function declaration:
void getAverage(int*);
void getSum(int*);
[Code] .....
I'm currently messing around with geolocation and have this Windows App I'm working on. There is no errors or warnings when I run it, but it does not work. I click my Enable GPS button and nada, nothing, zilch. This isn't a important project or anything just a learning experience for myself.
This is my C# portion if you need me to post the XAML side also I can do that as well.
using System;
using System.Collections.Generic;
using System.IO;
[Code].....
The opjective was to build an c# deskop windows application for an classic car sales company.
My job was the employees section of the application.
my problem is the following
i have 3 tabs
summary (overzicht)
details
mutation (muteren)
on the details tab i have 2 buttons and a search box both the buttons only do somthing on the summary tab where they also need to take the selected row to the field on the other tabs.
the search box is a text box that neds to find the valve in the summary tab and then als so select the full row and put it in the onther 2 tabs fields.
this is the code for the back en next buttons
private void btnback_Click(object sender, EventArgs e)
{
if (dataGridView1.CurrentRow.Index >= 1)
{
[Code]....
So, I've used int to float cast before. And it makes sense that it preserves the int value just converts it. I don't really need the answer, I'm just interested, and a resources could suffice.
1. Why in my test program it seems to preserve the int value, I expect that, but why for 0x8000 is it registering bit negation also. I know that is the negative bit for float, but it seems wrong. Is this an error in the gcc compiler conversion code?
2. What is the documentation on these type cast on how they actual work.
3. I know like no assembly, I'm wondering if some of the built in routines to handle or is it all c side code.
4. Can I convert type and preserve the bits. Maybe use void* casting ? I've never really bothered with void* so I don't all that I can do. Except be a pointer that doesn't know the type, obviously. I tested that out in the second code, the output doesn't seem correct, except -0.000. Is it working and my test numbers just are improper float format? It can't be that I test 0x3E20000 = 0.15625 from SingleWiki , but I got 1.328e-36 so the int to void* to float doesn't seem to work in the code below:
#include <cstdio>
int main(){
float flout;
unsigned int num = 1;
int ant;
printf("Int Shift float");
for(unsigned int shift=0;shift<32;shift++){
[Code] ....
I can not understand huge pointer, how its working.
#include<stdio.h>/ *How its working &decleration*/
int main(){
int huge *a =(int huge *)0x59990005;
int huge *b =(int huge *)0x59980015;
if(a == b)
printf("power of pointer");
else
printf("power of c");
return 0;
}