C :: Size Of The Data Type
Mar 4, 2014I want to find the size of the data type with out using sizeof() operator.
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C++ :: Data Type Size - Performance With References
Aug 16, 2012Here's what I'm trying to do : A simple readout that shows the input/feedback values for 10 different sensors (i.e. a motor, a thermocouple, light sensor, etc).
What I got so far:
The data is stored in 2 different arrays:
One array is a 2D string array that stores descriptions, and won't be changed:
Sensor ID, Sensor Type, Input Signal, Feedback Signal
["A"]["Motor"]["PWM Signal"]["RPM"]
["B"]["Thermocouple"]["N/A"]["TempC"]
etc
The second array is another 2D int array that stores all the data values:
Input Signal, Feedback Signal
[0][0] // for Sensor A, Input is 0 PWM, 0 RPM read from sensor
[0][25] // for Sensor B, Input is 0, 25C read from sensor
etc
My question: I'd like to re-write the code to incorporate the new things I learned in c++. Right now, the descriptions for all 10 sensors are in 1 array and the sensor values are in another array. If I use pointers to access the values, is there a performance difference between:
1. Keeping it as is, with 2 2d arrays
2. 1 big structure that has descriptions and sensor values for all 10 sensors (i.e. combining everything into 1)
3. 1 parent class, and 10 different objects for each sensor (i.e. splitting into 10)
C++ :: Compiler Time Checker - Invalid Application Of Size Of To Function Type
Nov 30, 2014I 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] .....
C :: Create New Data Type Data Declared As Int
Feb 1, 2015I'm trying to create a new data type Data declared as int. What comes up to my mind is to create a structure like
Code:
typedef struct Data {
int number;
} Data;
but when I need to use the data I need to go through the structure. Is this a good way to declare a new data type?
C++ :: Read N Data Items Into Two Arrays (X And Y) Of Size 20
Apr 1, 2013Trying to do a homework assignment for a class and how to read a file into an array. I've looked in our book and on several other forums and cant seem to find any examples of this. Below is the assignment I'm working on. I have a shell of the program that I can get to run, but getting a .txt file to read into an array is something I cant seem to figure out how to do.
Write a program to read N data items into two arrays, X and Y, of size 20. Store the product of the corresponding pairs of elements of X and Y in a third array Z, also of size 20. Print a three column table that displays the arrays X, Y, and Z. Then compute and print the square root of the sum of the items in array Z. Compute and print the average of the values in array Z and print all values above the average of array Z. Determine the smallest value in each array using only one function.
Use the two data files named DATAX.TXT and DATAY.TXT.
You must use functions for the reading of the data, computing the average, printing the three column table and printing the values above average.
C++ :: Size Of Object If There Is No Data Member In Class
Aug 20, 2013What is the size of object in c++ , if there is no data member in the class ?
View 3 Replies View RelatedC++ :: Initialize String Data Members As Nullptr Or As Zero-size Array?
Nov 4, 2014Is it generally better to initialize string data members as nullptr or as a zero-size array?
I can understand the former is superior from a memory-use perspective and also not requiring the extra allocation step. However, many string management functions will throw an exception - wcslen for instance - if you pass them a null pointer. Therefore I am finding any performance gained is somewhat wiped out by the extra if(pstString==nullptr) guards I have to use where it is possible a wchar_* may still be at null when the function is called.
C++ :: Data Structures - File Size Not Decreasing When Erase A Record
Nov 26, 2014// my size is not decreasing when I erase a record.
//dvr_hwch.cpp
#include <iostream>
#include <iomanip>
#include <cassert>
using namespace std;
#include "hash_chn.h"
void print_menu( );
[Code] .....
C++ :: Creating INF Data Type?
Jan 21, 2015I want to create a new data type called an inf_t. It's basically infinity (which for C++ is 1.7e+308). The only reason I want this is because I want to overload the cout << operation to print out INF/inf. Should I do this in a struct?
Code: struct inf_t {
private:
double inf = 1.7e+308;
};
std::ostream& operator << (std::ostream &stream, inf_t inf) {
stream << "INF";
return stream;
}
C :: Data Type For Date
May 18, 2014If I am asked to declare a data type for Date which should be in the format DD/MM/YY, which data type should i use for it? Is there any data type known as Date in C?
View 2 Replies View RelatedC/C++ :: Defining 3 Bit Or 12 Bit Data Type
Apr 9, 2015Is there a way to define a 3 bit or 12 bit data type in C/C++. I need these for defining my own packet having different bit length fields.
View 1 Replies View RelatedC++ :: Char Data Type Variable
Jun 12, 2013I have two char variables, m_GPSOffset[13] and m_FileName[100]. When m_GPSOffset has a value assigned to it, say for instance +11:25:30. The first entry of the value, in this case +, is always stored in m_FileName. I am clueless on why this is occurring.
View 15 Replies View RelatedC++ :: What Data Type To Treat Input As
Sep 3, 2013I know that an int is usually 4 bytes, ranging from -2^31 to 2^31-1 for a signed int and 0 to 2^32-1 for an unsigned int. My question is simply, bit-wise (I know they are labelled in the code), how does it determine whether to show -2^31 or 2^32-1 if it was 11111111 11111111 11111111 11111111 in bits? Is there a 5th byte to tell the compiler what data type to treat the input as?
View 3 Replies View RelatedC++ :: Integer Max - Long Data Type
Jan 4, 2013Working on a Project Euler problem and the question asks for the largest prime number that is a factor of 600851475143. As you can see, this is significantly larger than the maximum of a long data type, which maxes out at 2147483647.
I'm running on Windows 32, so int64 is not a valid option for me. It seems like I'll likely have to use a different language to solve this problem.
C++ :: Finding Out Input Data Type?
Oct 15, 2013I'm currently trying to solve a programming assignment and i got the logic of it, however i find it hard to implement.
What i need to do basically is fill an array with objects. Each object is a class that contains only one type of data. This means i can place int, double and string for example in one simple array.
However i can't figure out how to read data and then decide what it is. Even if i use templates once i call the function i have to give it a type, so getType<int> for example will not work with double or string.
I know about typeID and how to use it, i just can't figure out where to use it.
C/C++ :: How To Declare Alphabet Type Of Data
Feb 15, 2014I know how to store numeric data using keywords int, long, float, and so on. I'm making my own program called "Who is your soul-mate".The only question I want to ask is what's the keyword for storing alphabet data? As you can see below on my source file. I want to replace "int" keyword with another keyword that can store alphabet data. It's all in standard C.
#include <stdio.h>
int soulm01, soulm02, soulm03;
int year_of_birth;
int main(void)
[Code].....
C/C++ :: Node Data Return Type?
Apr 7, 2014In my main I have a do/while loop, which is to iterate around the method calculateImportance while i is not equal to the numNodes.
do
{
int i;
int numNodes = Test.count();
for(i=0; i<=numNodes; i++)
[Code]....
I have been messing around with the data type node, hence why it is there are present, but, that doesn't seem to the answer
This is the function declaration in the header file.
node CalculateImportance();
C# :: How To Pass Bitmap Data Type To DLL
Jun 24, 2014C# Code
[DllImport("dllTestForm.dll", EntryPoint = "showFormC")]
static extern void testShowFormC(byte[] photo,int len);
private void button6_Click(object sender, EventArgs e) {
Bitmap bmp = (Bitmap)Image.FromFile(@"d:11.jpg");
Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
[Code] ....
The program has no tip errors ,But there is no any picture display in c++ form,Tested the simple data types, such as int, can be normal .
C/C++ :: Data Type Checking For Integer
Jan 22, 2014Ok so I have this simple program that gets input from a user. I just want to put in a line of code to make sure that hte user can't type in something like "pizza" , I want to make it say that if the user puts in something that is NOT a number they will get a error back saying "Wrong! try again!" Here is my code :
#include <iostream>
using namespace std;
//Summation Program
//Function Prototypes
int get_num();
void compute_sum(int num, int &sum);
[Code] ....
C/C++ :: Data Type Checking With Pointers?
Sep 4, 2014Assume the user has already put in the number of students (hence my variables numStuds, which will most likely be irrelevant to my problem).
So suppose I have this:
void inputStudentInfo(string *names, int *movies, const int numStuds) {
for(int i =0; i < numStuds; i++) {
cout << "Enter student name: "; getline(cin, names[i]); read_string(names[i]);
[Code] ....
Then I have my data type checking function:
//Data-Type Checking for strings
string read_string(string Sname) {
while(!cin.good())
[Code] ....
I am getting errors. I know the problem I think is that I am trying to data type check for a string made up of pointers* with just a string but I don't know how I am supposed to check this?
C++ :: New Data Type In Method Declaration?
May 26, 2013I want my method of the class to take as an input an array of data type derived from class. How can I do this?
Code:
class Planet {
public:
// typedef class Planet PlanetType;
void GetForce(int, PlanetType []);
};
Or when should I define my new data type PlanetType?
C :: Error To Define Data Type File?
Mar 21, 2013I program unix sokcet programming , and part of my code is ti open file from server and open it , but i surprised with this wierd error i dont have any reason for it ?
Code:
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
[Code] ....
File name is : myHeader.h
myHeader.h:24:1: error: unknown type name "File"???
C :: Which Data Type Have To Enter To Get 12 Digit Numbers
Jul 8, 2013I've seen some threads that include the information about what data types one has to use usually to put a number of 12digit. But honestly speaking none of them works for me & it takes me a lot suffering about the data type. Even I've googled but I didn't get any specific result.
So, which data type I'd have to use to enter 12digit number.
I'm writing a code to find the largest prime factor of the number 600851475143
C++ :: Possible To Use Data Type Double Or Float For Array?
Mar 9, 2014Can you use data type double or float for an array? ie
double n[];
or
float a;
float m[a];
My code wont accept me changing the data type..will on accept int data type. I get the following error when I try to change the array to double or float..
3310E:C++vector.cpp[Error] invalid types 'double [1000][double]' for array subscript
C++ :: Intellisensor Not Recognizing String Data Type
Apr 26, 2014So Im working on my semester prject for my programming class. It is to make a roulette game. And Im working on getting my table set up but the intellisensor in my Visual Studio seems to not be working and recognizing the string variable type. Its not changing to blue when I enter it.
This program is a roulette simulation, designed to be used for online gambling.
#include <iostream>
#include <iomanip>
#include <Windows.h>
#include <string>
#include <ctime>
using namespace std;
//Function Prototypes
void welcome();
double getBalance();
[Code] .....
When I run the program it gives me an error as well sometimes. This one: Unhandled exception at 0x0f681f68 (msvcp100d.dll) in Roulette Final Project.exe: 0xC0000005: Access violation reading location 0x8bb59d35.
Which opens another tab named "iosfwd" and points to this bit of code:
static int_type __CLRCALL_OR_CDECL to_int_type(const _Elem& _Ch)
{// convert character to metacharacter
return ((unsigned char)_Ch);
}
C++ :: Put Enumerated Data Type For Poker Program?
Aug 21, 2013put enumerated data type in c++ for a poker program (specially for color and cardtype)?
Here are some codes:
//card.cpp
#include "cCard.h"
using namespace std;
cCard::cCard()
[Code]....