Visual C++ :: Writing Formula For Standard Deviation?
Apr 17, 2013How to write a formula for standard deviation but im having a hard time ?
View 2 Replies
ADVERTISEMENT
Visual C++ :: How To Calculate Average And Standard Deviation
Oct 21, 2013I've been trying to calculate the Second standard deviation but the average in the second loop isn't calculating correctly which is causing the standard deviation (method 2) to not calculate correctly.
Code:
#include <iostream>
#include <iomanip>
#include <string>
#include <fstream>
#include <cmath>
using namespace std;
int main () {
cout << "
This program will produce statistics (Mean, Standard Deviation, "
[code]...
C++ :: Calculating Mean And Standard Deviation?
Oct 21, 2013I've been trying to calculate the Second standard deviation but the average in the second loop isn't calculating correctly which is causing the standard deviation (method 2) to not calculate correctly. I can't find anything wrong.
Code:
#include <iostream>#include <iomanip>
#include <string>
#include <fstream>
#include <cmath>
usingnamespacestd;
int main ()
[Code]...
C++ :: Calculate Standard Deviation
Jul 11, 2014I have a program that will calculate max, average, etc from a file of numbers. However, I cannot get it to calculate standard deviation.
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <cmath>
[code]....
C++ :: Calculating Standard Deviation From File
Mar 21, 2014Here's my attempt:
input.open(name);
if (input.fail()){
cout <<"Error opening file"<<endl;
}
while (input>>numbers)
{
counter++;
total += numbers;
[Code]...
Copy of the output:
Error opening file
The Standard Deviation of all the numbers is: -9.25596e+061
Press any key to continue . . .
Its not giving me the right answer.
C++ :: Unable To Compute Standard Deviation?
Mar 15, 2014Unable to compute Standard Deviation
View 1 Replies View RelatedC++ :: Output Correct Standard Deviation
Feb 1, 2015The program does compile the average and the mean correctly. I can't understand why the standard_deviation member function isn't applying the sqrt properly:
#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
const int N = 10;
class Standard_Deviation {
[Code] ....
C++ :: Compute Mean And Standard Deviation From A Set Of 10 Random Scores
Nov 18, 2014I have to write a program in which it is to compute the mean and standard deviation from a set of 10 random scores between 1 and 20. The C++ program should generate a set of scores randomly and then, compute the mean and standard deviation from such a set of scores.
View 2 Replies View RelatedC :: Calculate Variance And Standard Deviation - MATH Error
Mar 6, 2015The values in my file are 5,5,332,156,11,0,555,32,8,9 .... the computer when I scan and read is missing the first 5 and only showing 9 values which is messing up my mean and standard deviation. But when I have them put in order all of my numbers show up:
Code:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define SIZE 100
void bubbleSort( int * const array, size_t size);// prototype
[Code] .....
if possible, why won't the median work. I have it commented off as of right now....
C/C++ :: Writing And Reading From Standard Input
Mar 18, 2015I have an HTTP/1.0 webserver that I'm building in C that needs to exhibit CGI script functionality. Specifically, what I'm having trouble with is that I have two processes: process 1 is the webserver, process 2 is the CGI script. I fork in the webserver, and then call exec to run the CGI script (specifically, I used execv()). I've read from the CGI specifications in the RFC that in the case of a webserver receiving a POST request, the CGI script should read the arguments for the POST request from stdin. However, when I write to stdin, it simply echoes what was written to the terminal window and when the CGI script tries to read from stdin, it blocks.
So, with all that said, I'm pretty sure there is some simple conceptual explanation to my problem, but I can't figure it out. Do I need to use pipes or some form of interprocess communication to send the data from the webserver to the CGI script, or can it just be done with stdin (and possible stdout)?
Visual C++ :: Totals Or Formula To Calculate Is Not Working?
Sep 19, 2014My code is below:
Total Interest ends up as my last Monthly Payment amount instead of adding up all Interest Paid - What am I doing wrong?
Total Paid isn't calculating correcly either - What am I doing wrong?
I suspect both are very similar problems. I've tried several different calculations, but cannot figure this out.
#include <iostream>
#include <cmath>
using namespace std;
double GetMonthlyIntrest (double OpenBalance,double rate);
bool ContinuePgm();
int main () {
double StartingBalance,rate,amount,OpenBalance,IntPmt,TotalInt=0.0,GrandTotal=0.0;
[code]...
Visual C++ :: File Writing With Onsavedocument
Oct 15, 2012Code:
void CFileMgm::write(string fname, solutions databox) {
file1.open (fname.c_str(), ios::out);
if (file1.is_open())//if(file)+ {
file1<<"Population Size is : ";
file1<<databox.pop_size;
[Code] ....
I don't know why this code is unable to write any thing in file. Following is onsavedocument function
Code:
BOOL CTspGeneticAlgoDoc::OnSaveDocument(LPCTSTR lpszPathName) {
string filename = (string) lpszPathName;
CFileMgm mydatafile;
mydatafile.write(filename,sol);
return CDocument::OnSaveDocument(lpszPathName);
}
Visual C++ :: Reading / Writing Registry In Windows 7?
Feb 19, 2013I have a 32-bit application that I've been maintaining for about 12 years and it runs on every Windows platform up to Windows 7. In all that time I've been using CWinApp::GetProfileXxxx() and CWinApp::WriteProfileXxxx() calls to read and write my program settings (about 70 settings) in the Registry. The settings are read from the Registry at start-up and written to the Registry when the program closes. There is also a method for the user to read and write the program settings to an INI file using the same code as the Registry access.
On my Windows 7 system the Registry read/write works just like it always has on all previous Windows versions. However, on some customer's Windows 7 machines there appears to be a problem with the Registry access. The program settings are either not being read from the Registry or are not being written to the Registry. I think the settings are not being written - but I don't know that. When the user uses the INI file the settings appear to be read and written.
The customer has complained a bit (I'd complain too) but doesn't have the time or doesn't want to take the time to run some simple tests for me to find out what's going on with his Windows 7 system.
So here is my question: Are there any user account settings or permissions that can block the program's access to the Registry? He claims he is an Administrator but I can't even get him to verify that.
Visual C++ :: Writing Structure To CSV File Won't Work
Jan 23, 2013I need to compute some values, place them in a structure containing two vector variables, and save them in a CSV file. Right now, I can't even generate a file. I wrote the structure definition and file writing code in a header file (after first borrowing it). I have a "button" that is supposed to trigger all of the activity. I'll attach the code below:
HEADER
________-----_______------
#ifndef EINSTEIN_H
#define EINSTEIN_H
#include <stdio.h>
struct SizeAll{
int year;
double R;
};
int write_to_file(int count, struct SizeAll *data, char const *fileName)
[code].....
My grasp of pointers and how and when to use them evaporated long ago.
Visual C++ :: Writing To HKLM Registry In Windows 7?
Jul 8, 2013When I write to the Windows 7 Registry at HKEY_LOCAL_MACHINE, I get a return code of 5 which is the "access denied" message when I execute RegCreateKeyEx.
This happens even if the User has administrator rights.
How can I tell Windows 7 to allow the program to write to the registry?
The application is a 32-bit application and it should be allowed to run in either a Windows 7 32-bit or 64-bit machine.
I noticed that when I run certain popular programs, a User Account Control dialog box comes asking:
"Do if you want to allow the following program from an unknown publisher to make changes to this computer".
Should my application call User Account Control and if so, how do I do it in C++ Visual Studio 2008?
I also found out that 64-bit Windows machines have two registry hives. Is there a different code to handle the same task?
Visual C++ :: Writing A Lexical Analyzer / Parser
Oct 6, 2012I'm trying to learn more about how Lexical Analyzers/Parsers work. I haven't coded any classes yet, because i'm not really sure how the entire process from a Lexer to working code goes.
My goal is to write a simple made up programming language and translate that to another language, like Javascript. The first thing i have to do is give the code to a Lexical Analyzer.
The lexer will split the source into tokens and assign a label to it. So suppose i have the following code:
Code:
def myVar = 10;
The lexer will split that into token like this:
Code:
def -> keyword
myVar -> Identifier
= -> Operator
10 -> Number
That's basically as far as i understand what a lexer does. How can i translate the tokens to a language like Javascript? From what i understand i need to write a Parser class. But i couldn't find any info on what that class exactly does. So what is exactly the next step i have to take?
Visual C++ :: Writing And Reading Char Bytes?
Jun 26, 2013I have used the following code to write and read wchar_t bytes from a disk file:
Code:
int WriteBytesW(wchar_t * wcp, int nsz, wchar_t * wcfilepath) {
wfstream wf;
codecvt_utf16<wchar_t, 0x10ffff, little_endian> ccvt(1);
locale wloc(wf.getloc(), &ccvt);
wf.imbue(wloc);
[Code] ....
Output:
save bytes succeeded
1234 5678 9ABC EF12 ABCD FE21 DCBA 1F2A EFFF 02FF
read bytes succeeded
nsz =: 20
Now, if wbuf[8] = 0xefff; is replaced by wbuf[8] = 0xffff;
Output:
save bytes succeeded
1234 5678 9ABC EF12 ABCD FE21 DCBA 1F2A 02FF
read bytes succeeded
nsz =: 18
Obviously, the 0xffff wbyte is not read. WHY ?
This presents a significant problem when attempting to read ALL wbytes from a file.
Visual C++ :: Reading And Writing Values From Excel Spreadsheet
Jul 31, 2013I just got a job programming a windows application. One of the requirements is reading and writing values from an excel spreadsheet. Looking online, it appears that C++ isn't the best (one of the worst?) languages for reading and writing values from excel files. Now the language I'm most familiar with is C++ and I've been looking at C#, and it appears to be much easier to read excel files.
View 8 Replies View RelatedC++ :: Compound Interest Formula
Jun 21, 2013Equation for compound interest. The interest is supposed to be $43.34 according to the book, I am ending up with around $35. The actual equation is amount = principal * (1 + rate/t)^t where t = number of times compounded per year. I still have to go through and clean up all the code I just want the formula working first.
#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
int main () {
float princ, rate, comp, savings, interest, rates, year;
[Code] .....
C/C++ :: Quadratic Formula - If Statement Being Ignored
Jan 28, 2014We are suppose to build a program to do the quadratic formula, which isnt really a issue. my issue is i have a if else loop and my if is being ignored.
what i want it to do is is state that if the (b * /> - 4(a)© is a negative, then it prints out stating it cant do this.
note: i know that i can use the i number system but we have been asked to not too and to do this instead.
here is my code
#include <stdio.h>
#include <math.h>
int main() {
float a, b, c, d, e, f, g, h, i; /* i would love to figure out a way to do this without so many variables*/
[code]....
Visual C++ :: Writing A Function That Sort Elements Of Array In Numerical Order?
Oct 17, 2014 I have to write a function called sortMe that sorts the elements of an array in numerical order from highest to lowest values (descending order) or vice versa (ascending order).
The assignment asks to: NOT re-arrange elements in the array; instead, it uses a second array, an array of indexes for the elements in the original array and then sortMe sorts the second array based on the values in the original array. A sorted version of the original array can then be produced with these sorted indexes.
Header of the function sortMe must be as shown below:
void sortMe(int array[],int sortedIndexes [], int size, char mode)
When mode is 'a', the function sorts the array in the ascending order, and when mode is 'd', the function sorts it in the descending order.
Declare and initialize the array array.
Declare the array sortedIndexes but do not initialize it. You are going to play with the array sortedIndexes in the function sortMe.
EXAMPLE:
int array[5]={3, 5,-1,10,0};
int sortedIndexes[5];
sortMe(array,sortedIndexes, 5, 'a');
After the function call, the elements of the array sortedIndexes should be: 2,4,0,1,3.
notice that the function does not e-arrange the elements in the array.
Code:
#include <iostream>
using namespace std;
void sortMe(int[], int, char);
void main() {
int arr[6] = { 14, -5, 5, 0, 22, -99 };
[code]...
how to use the other array.
Visual C++ :: Enable Writing To And Reading From Files - Unresolved External Symbol
May 13, 2013Perhaps this can be a very popular error,
Code:
#include <stdio.h>
#include <tchar.h>
#include <iostream>
#include <string>
#include <fstream>// enable writing to and reading from files
#include <cstdlib>
#include <time.h>
using namespace std;
class Person {
[Code] .....
Error list:
Code:
Error 1 error LNK2019: unresolved external symbol "void __cdecl saveperson(void)" (?saveperson@@YAXXZ) referenced in function _main H:Cry_DevProgrammingC++Using_class_ in_ c++Using_class_ in_ c++Using_class_ in_ c++.obj
Error 2 error LNK2019: unresolved external symbol "void __cdecl displayperson(void)" (?displayperson@@YAXXZ) referenced in function _main H:Cry_DevProgrammingC++Using_class_ in_ c++Using_class_ in_ c++Using_class_ in_ c++.obj
Error 3 error LNK2019: unresolved external symbol "void __cdecl editperson(void)" (?editperson@@YAXXZ) referenced in function _main H:Cry_DevProgrammingC++Using_class_ in_ c++Using_class_ in_ c++Using_class_ in_ c++.obj
Error 4 error LNK1120: 3 unresolved externals H:Cry_DevProgrammingC++Using_class_ in_ c++DebugUsing_class_ in_ c++.exe 1
What I can do to fit this problem?
C++ :: Compound Interest Formula Coding
Sep 24, 2014Im having problems coding this
A = P(1 + r/n)nt
//Declared test cases
float principal = 200000.00, annualInt = 0.03;
float years = 10.0;
float calcInterest1(float principal, float years, float annualInt) {
float interest1;
float nt = annualInt*12;
float A = principal+annualInt;//Accrued Amount
interest1 = (A = (principal*(1+years/100))pow(nt));// A = P(1 + r/n)nt
return interest1;
}
C++ :: Creating A Loop To Calculate Formula?
Mar 21, 2014I am trying to create a code and cannot get the following part to work :
for (int n = 0; n = timesteps; n++)
{
n = n + 0.1 ;
cout<< "timesteps"<< n << endl ; //print time step value =0.1
for (int j = 0; j < nodesinx; j++)
{
T[j][n+1] = T[j][n] + 0.16 * (T[j][n] - 1[n] - 2[T[j][n] + T[j] + 1[n] ; //equation
n= n + 0.1 ;
cout<< "temperature" << T[j][n+1] << endl;
T[j][n+1] = 0.0 ;
}
}
C/C++ :: Define The Formula Of Prime Numbers?
Jul 27, 2014It is possible to define the formula of prime numbers in C++ language?
View 1 Replies View RelatedC :: Visual Studio 2012 - Writing Data Into TXT File / How To Stop Reading Char
Feb 23, 2013I am using visual studio 2012.....in below code i m writing data in to a test.txt file but i dont know with which key file stop accepting char...i tried ctrl+z and ctrl+d but not working ....
Code:
#include<stdio.h>
#include<conio.h>
main(){
char ch;
FILE *ptr;
[Code] ....