C / C++ / MFC

Re: Loading DLL from file not PATH

16-Jun-22 5:22

I have been working on a possible answer to this. If you send me a personal email (see the link below this message) I can let you have the details, and the code.

One of the things I have discovered is the the jvm.dll must be the same version as that of the javac compiler that buiolds the class file(s).

Valentinor16-Jun-22 6:06

Valentinor

16-Jun-22 6:06

I don't see any link it might have been cut, or it is hidden, but this is an old email I have that I don't care about spam so it is fine to make it public:
Email removed

modified 17-Jun-22 11:03am.

Measure ITEM ITEMDATA string coming in as Wide Character string

ForNow6-Jun-22 17:28

ForNow

6-Jun-22 17:28

Hi

I am adding a string to listbox as a 8 bit ansi string for example the string is "8FED90" ending with a null
however when the MeasureItem method is called

itemData points to the string as wide so it display in memory as 38 00 46 00 45 00 44 00 39 00 30 00

I have Character set as "NOT SET" in my property pages -> Advanced in Visual Studio

Thanks

Re: Measure ITEM ITEMDATA string coming in as Wide Character string

Richard MacCutchan6-Jun-22 21:01

6-Jun-22 21:01

That does not make sense. The data pointed to by the MEASUREITEMSTRUCT is what you have set when you create the control. However, whether it is ANSI or Unicode does not matter, as the actual display dimensions will be the same.

Grades

Stephanie Foley6-Jun-22 7:38

Stephanie Foley

6-Jun-22 7:38

Use an input file

An instructor has asked you to write a program that can tell him if his students have passed or
failed his course. He has a file that contains the following information:
• first name
• last name
• five quiz grades
• the midterm exam grade
• the final exam grade
Your program must read these values into variables then use those variables to calculate the
final average and finally display that average to the screen.
Requirements:
1. All input comes from a file – grades.txt. You may NOT ask for input from the professor. This
file is posted on Canvas for your program to use.
2. Remember: Your program must calculate the final average including those quizzes. All the
quizzes averaged together count as much as a test. So, to calculate the final, you need to
calculate the quiz average first, then average the midterm + final + quiz average.
3. Display the student’s last name first, comma, space and first name. Follow that with the final
average as a whole number, rounded up
The file contains one line of data in the following order:
firstName lastName q1 q2 q3 q4 q5 midterm final
Remember, data must be read in sequentially! This means that the first name variable must be
initialized before the last name or the quiz one and etc.

Code:
#include <iostream>
#include <fstream>
using namespace std;

/* run this prgram using the console pauser or add your own getch, system('pause") or input look */
int main(int argc, char** argv)
{
string firstName,lastName;
int q1, q2, q3, q4, q5, midterm, final;
int quizaverage;
int average;

ifstream inFile;
inFile.open("grades.txt");

inFile>>firstName>>lastName>>q1>>q2>>q3>>q4>>q5>>midterm>>final;

//Calculate the quiz average.
quizaverage=(q1+q2+q3+q4+q5)/5;

average=(quizaverage+midterm+final)/3*100;

cout<<"Dobbs, Bob"<<" Average: "<<average;

inFile.close();
return 0;

I need help with this. I am trying to use the numbers given from a text file in the program.

Richard MacCutchan6-Jun-22 9:08

6-Jun-22 9:08

Stephanie Foley wrote:
I need help with this

Exactly what help do you need?

Stephanie Foley6-Jun-22 10:03

Stephanie Foley

6-Jun-22 10:03

I need to use an input file to find that course average. The course average is a mathematical expression involved in quiz average, midterm grade, and final grade. I am trying to get the program to read what is in the file. There is the first name, last name, and 7 numbers. I need to use these values in the program to get an average for the class.

-- modified 6-Jun-22 16:22pm.

Richard MacCutchan6-Jun-22 10:19

6-Jun-22 10:19

Well you stated that in your original question. But you have still not explained what your problem is.

jeron16-Jun-22 11:29

jeron1

6-Jun-22 11:29

How are your results different from what is expected? Also, showing the files exact contents would be helpful.

"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle

reference question

focusdoit5-Jun-22 12:50

focusdoit

5-Jun-22 12:50

I found, a statement,
int &a = 1;
the statement can be built in QT Creator, mingw_64.

while on Programiz: Learn to Code for Free[^]

Got,

gcc /tmp/BlXEG8NqhU.c -lm
/tmp/BlXEG8NqhU.c: In function 'main':
/tmp/BlXEG8NqhU.c:6:15: error: expected identifier or '(' before '&' token
    6 |     const int &a = 2;

so the int &a = 1;
is that right?
a is a bias name of "1" in rodata?

Re: reference question

k50545-Jun-22 13:26

k5054

5-Jun-22 13:26

I suspect that whatever QT Creator is doing is somehow creating a const reference . e.g.

C++

int &a = 1; // fails to compile
const int &b = 2;  // compiles fine

Consider what int &a = 1 means: I.E. create a reference to the integer 1. If that were to compile successfully then consider

C++

int &a = 1;
a = 2;
std::cout << 1 + 1 << '\n';

By the rules of C++, at least as I understand them, that should print 4, since you've changed the value of 1 to 2 at the assignment statement.

Keep Calm and Carry On

Re: reference question

Richard MacCutchan6-Jun-22 0:52

6-Jun-22 0:52

You are trying to use a C++ construct in a C-language program.

math

Calin Negru4-Jun-22 20:13

4-Jun-22 20:13

is a floating point number still considered a number? I`m talking about a number that is not whole. Like for instance 0.01 feels like less than a 'number'

Victor Nijegorodov4-Jun-22 20:42

Victor Nijegorodov

4-Jun-22 20:42

Well, let's go back to 1870:
https://www.cantorsparadise.com/kronecker-god-and-the-integers-28269735a638
And, BTW, your question has nothing do do with C/C++/MFC Forum. Unsure | :~

Richard MacCutchan4-Jun-22 21:10

4-Jun-22 21:10

Yes it is a number: The Evolution of Numbers[^]

Calin Negru4-Jun-22 22:03

4-Jun-22 22:03

Victor, Richard thanks for your useful feedback.

views from an 'average' user.

Richard MacCutchan4-Jun-22 22:10

4-Jun-22 22:10

You're welcome. That website is really useful for any mathematical issues.

Calin Negru4-Jun-22 23:04

Game loop and time measurement.

4-Jun-22 23:04

I`ll keep it in mind.

Member 152127684-Jun-22 5:23

Member 15212768

4-Jun-22 5:23

There is the function `Sys_Milliseconds`:

    <pre>int	curtime;
    int Sys_Milliseconds (void)
    {
    	static int		base;
    	static qboolean	initialized = false;
    
    	if (!initialized)
    	{	// let base retain 16 bits of effectively random data
    		base = timeGetTime() & 0xffff0000;
    		initialized = true;
    	}
    	curtime = timeGetTime() - base;
    
    	return curtime;
    }

Used in time calculation in the Quake 2 main game loop implementation:

//...
    oldtime = Sys_Milliseconds();
    //...
    while (1) {
    		//...
    
    		while (PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE)) {
    			if (!GetMessage(&msg, NULL, 0, 0))
    				Com_Quit();
    			sys_msg_time = msg.time;
    			TranslateMessage(&msg);
    			DispatchMessage(&msg);
    		}
    
    		do {
    			newtime = Sys_Milliseconds();    			
    			time = newtime - oldtime;
    		} while (time < 1);
    //...
    }

I'm wondering about the usage of the `Sys_Milliseconds` at all. What's the point in `base = timeGetTime() & 0xffff0000` line? Why are they applying the 0xffff0000 mask on the retrieved time? Why not just use the `timeGetTime` function directly:

//...
    oldtime = timeGetTime();
    //...
    while (1) {
    		//...
    
    		while (PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE)) {
    			if (!GetMessage(&msg, NULL, 0, 0))
    				Com_Quit();
    			sys_msg_time = msg.time;
    			TranslateMessage(&msg);
    			DispatchMessage(&msg);
    		}
    
    		do {
    			newtime = timeGetTime();    			
    			time = newtime - oldtime;
    		} while (time < 1);
    //...
    }

Re: Game loop and time measurement.

Mircea Neacsu4-Jun-22 7:47

Mircea Neacsu

4-Jun-22 7:47

Member 15212768 wrote:
What's the point in `base = timeGetTime() & 0xffff0000` line?

To avoid being too close to rollover point. From "timeGetTime function | Microsoft Docs"[^]:

Quote:
The return value wraps around to 0 every 2^32 milliseconds, which is about 49.71 days. This can cause problems in code that directly uses the timeGetTime return value in computations, particularly where the value is used to control code execution. You should always use the difference between two timeGetTime return values in computations.

Mircea

Re: Game loop and time measurement.

Calin Negru4-Jun-22 10:43

College Project Visual Enhancement

4-Jun-22 10:43

Thanks to parallel processing these days you can feed in your game loop a constant value as time variable. (there is no fluctuation between frames as far as time is concerned). You should care about Frame Rate Independent movement only if you`re developing a game meant to hit the store shelf.

modified 5-Jun-22 2:07am.

Tomás Temperley2-Jun-22 15:31

Tomás Temperley

2-Jun-22 15:31

Hello!, this is my first post on this forum and i'm trying to understand how this works, so if this is not the proper way of asking for help or this is in the wrong subforum just let me know please!

I'm currently studying App Development, and as sort of a "final project" to pass the course, me and my group have to make a proyect that tracks both users and their data consumption.
Since we're restricted to using codeblocks and c language, I wanted to get some insight on how to improve the visual aspect of the cmd, and user experience overall.
I havent found many content of this kind online so any tutorial or explainatory about this subject would be very helpfull, since we havent been taught too much about this side of the coding, and I think this will be a great adition to the proyect, and learning experience overall.

Thanks!

Re: College Project Visual Enhancement

Richard MacCutchan2-Jun-22 21:48