C :: Do Loop Does Not Exit On Keyword
Jun 30, 2014
for starters i hope this question wasn't posted yet.i want to write a small program that askes the user what he wants to do , and then executes the comand in system . But for some reason it doesn't quit on the key word this is the code:
Code:
#include <stdio.h>
/*a simple interaction programme that schow the system options*/
#define systemt "x1b[32m" /*changes the color to green for system output*/
#define user "x1b[0m" /*changes the color to white for user input*/
int main() {
[Code]...
Is there something wrong white the code or does the system bock me from reusing the choise string. i'll inculde the original c file as well
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Oct 28, 2014
So I have been assigned a program that counts keystrokes, alphabetical characters, and vowels. I have the program working as desired but I just can't figure out how to make it end upon ONLY the "return" key being pressed.
Code:
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
int main ( void ) {
[Code] .....
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Jan 26, 2014
In c# extending the class and implementing an interface is done by : symbol.. But c# has extend keyword. What is the use of extend keyword in c#?
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Jan 6, 2014
have a look at the following code :
class Base
{
public:
virtual ~Base()
{
cout << "Calling ~Base()" << endl;
[Code]...
Now this program produces the following result:
Calling ~Derived()
Calling ~Base()
i was reading online and got stuck here. i am unable to understand why 'calling ~Base()' is been printed here? when we reached delete pbase; in int main() it goes to Base class first and finds that its destructor is virtual so it goes to Derive class and finds another destructor and executes it but why does it prints ~Base() in any case?
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Feb 19, 2014
How to put virtual keyword in the function of the base class. Will the function still be over-written properly? What will happen if I
(1) call function from base class pointer
(2) call function from derived class pointer
(3) call function from derived class object
If the virtual keyword is present, the over-written version will be called in all cases, am I mistaken?
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Feb 14, 2014
One thing make me consider:
FistClass F1 = new FistClass ();
FistClass F2 = F1;
second line why i dont need to firstly create instance for F2 and then make reference betwwen to classes like:
FistClass F1 = new FistClass ();
FistClass F2 = new FistClass ();
F2 = F1;
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Sep 24, 2014
I'm trying to read a C code, but there are functions including CLASS word at the titles of functions. Is it a correct implementation?
For example: double CLASS getreal (int type)
What is the meaning of CLASS in titles of functions in C? I could not find such an usage in my C book?
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Aug 18, 2014
I was trying to make a tic tac toe game where the user can play against the computer
It s in borland c++ and not in c++ 11 so i wanted to convert it into c++11. My program shows error since there is nothing called conio.h in c++11. Hence I want to know if there is any alternate keyword gor the function getch() so that i could ask the user to press [ENTER].
Code:
#include<process.h>
#include<stdlib.h>
#include<string.h>
#include<iostream.h>
#include<conio.h>
int usbox,i,j,nandu=0,result,cusb,cobox,r,d;
int playl=0;
char copybox[10];
[Code] ....
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Apr 13, 2013
how can I make a class non inheritable,,, without using keyword "final" ?
class A
{
//
};
A obj; // No error
class B : public A
{
//
}; // error
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Jun 24, 2014
Is the bool keyword in C exactly like the boolean keyword in Java? why this code is getting an 'unknown type error' when I initiialze looping.
#include <stdio.h>
#include <stdlib.h>
int main()
[Code].....
If I am completely using the boolean concept wrong in C, should I just use break statements instead?
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Oct 11, 2014
In C++ by FLTK, to define a circle we use some code like this:
Circle c(Point(x,y), r);
And we can using vector_ref put and save them in a vector, like:
Vector_ref<Circle> vc;
vc.push_back(new Circle(Point(x,y),r));
Ok, those were about Circle and no problem till now!
Triangle can be defined like this for using in codes:
Graph_lib::polyline poly;
poly.add(Point(x1,y1),r1);
poly.add(Point(x2,y2),r2);
poly.add(Point(x3,y3),r3);
and this is a vector to saving them:
Vector_ref<Graph_lib::Polygon> vp;
The problem is that how to save/put triangles/polylines into that vp vector using new keyword like the circle does?
My sig: Save Cobani.
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Jan 30, 2014
I think there is no always need of keyword extern in order to declare variables globally. Is it right?
For example I can declare a variable globally in one file and use it in some other provided that I have included the last one file ( that has the declaration of the variable of course) and compile these files together :
gcc -c f1.c f2.c for example
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Nov 8, 2014
I'm working on a program that reads in a .txt file and searches through the text for a keyword. If it gets a hit on the keyword, the line number where the keyword is located and the line that contains the keyword is printed out. What I have now doesn't catch every occurance of the keyword "a".
Code:
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv) {
[Code]......
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Apr 25, 2014
I am reading a file whick looks like following:
Code:
10 = NAND(1, 3)
11 = NAND(3, 6, 5)
15 = NAND(9, 6, 2, 8)
Problem: I have to find the word "NAND" and then find the numbers inside the brackets because they are the inputs to that NAND gate. I have written a code below but that code can detect the fixed number of inputs. I need a code which can detect any number of inputs (whether 2 inputs or more than two). But i don't understand how do i do that?
My code:
Code:
string input_str ("INPUT"), output_str ("OUTPUT"), nand_str("NAND");
while (getline( input_file, line ))
{
std::size_t guard_found = line.find(guard_str);
[Code].....
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Jun 4, 2014
Not sure what am doing wrong on this program, trying to use atoi to hit 'Z' to exit from the console:
<
#include "stdafx.h"
#include <iostream>
using namespace std;
#include <cstring>
#include <cstdlib>
int _tmain(int argc, _TCHAR* argv[])//main program begins here.
[Code] .....
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Feb 4, 2015
I've been reading my code for the past 3 days and I cannot get 0 to exit the program.
#include <iostream>
#include <cctype>
#include <cstring>
#include <cstdlib>
#include <fstream>
using namespace std;
size_t dub_count = 0;
size_t op_count = 0;
[Code] .....
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Aug 19, 2013
I am working on a project with rf2500 radio sensors and a state machine handles the whole fucntion of the sensor.. I have this while statement
Code:
while(state!=STATE_STATENINETYFIVE){
__bis_SR_register(LPM3_bits + GIE);
__no_operation();
}
which stop the sleep mode of the CPU every time the STATE_STATENINETYFIVE comes up. I want to make it like this
Code:
while((state!=STATE_ABRRECEIVE)||(state!=STATE_STATENINETYFIVE)){
__bis_SR_register(LPM3_bits + GIE);
__no_operation();
}
So if STATE_ABRRECEIVE or STATE_STATENINETYFIVE comes up exit the while too.
I read some previous post about and I thought to change the logical OR || with AND && but din't work for me... state is type of u_int8_t. Is it a logical error???
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Oct 25, 2014
I'm trying to make a very simple reaction game where a random number flickers on the screen for a fraction of a second and the user has to then enter the number before another comes on the screen after a random amount of time. However I dont know how i would make it so that the user cannot enter anything after a certain amount of time has passed, below is my code?
Also FYI, clock_start is at 5100 because by the time the program actually gets to scanning in the first number the time is at an absolute minimum of 5050 milliseconds however obviously this is an impossible number to reach due to processing, my machine clocks in at 5080.
Code:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <windows.h>
int main(void){
[Code]...
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Sep 1, 2014
I have a function which sometime takes more than 24 hours to run. So I want a code which will check the time and exit the function if the function executin is not successful and return to main function.
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May 11, 2014
I was writing a program and it started crashing on exit (segment fault), after the 'return 0' in main(). I figure it's an std destructor.
I started with the program I was writing and just stripped out as much as I could, while making sure the crash persisted. If I remove any of the remaining code the crash disappears, even the seemly unrelated or scoped code.
#include <iostream>
#include <fstream>
#include <condition_variable>
#include <mutex>
#include <thread>
/* Call stack results:
[Code] ....
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May 1, 2014
This program I'm working on just exits unexpectedly right after outputting "Expression?"
int main(void) {
provideHelpIfNecessary();
while(true){
cout << "Expression? ";
[Code] ....
And I'm not allowed to change anything in main().
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Feb 20, 2013
I need to create a command where the user inputs a character and it'll exit out the program rather than executing any of the other code.
For example :
If I wanted to do like
char key;
if (key == D || key == d)
{
}
What would I need to put in between those brackets under the if statement to allow the user to enter the letter D and it would close out the program?
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Feb 4, 2014
I have a SDI application. I created a method OnClose to handle ON_WM_CLOSE of CMainFrm. This onclose() function calls a method in cmyview.cpp. Here, I created a thread that calls global function and from this function it calls another function in cmyview.cpp. At certain condition my application should close at here, I used postmessgae(WM_CLOSE (or) WM_DESTROY). I am having an error as object reference not set on postmessage(WM_CLOSE) it is going to afxwin2.inl page where exception occurs.
Below is code snippetHere, either j or k will only be true depneds on user input)
MainFrm.cpp:
void CMainFrame::OnClose()
{
CMyView* pview = (CMyView*)((CFrameWnd*)AfxGetMainWnd())->GetActiveView();
pview->method1();
}
[Code]...
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May 19, 2013
How to write a simple script to convert F to C. That was easy enough once I read about how C treats the math of 5/9 being less then 1 thus converts to 0. Fixed that issue and the code works great.
I find it a useful tool and would like to, way outside of the scope of the homework mind you, figure out a way to get the script to restart if a [Yy] answer is provided at the end of the script. All other responses result in return(0).
I only have limited knowledge in BASH scripting. In BASH i would have just placed the int main(void) {foo} into a single function then created a simple if/then test after the function is called.
Reading up on functions in C, they do not work in the same way I would like to treat them from BASH. understandable this is not BASH.
then i started looking into do/while loops. On an other forum someone pointed out the possibility of using fgets as part of the challenge response. Now when I try to compile the code im getting an odd result. for some reason the compiler seems to think that my character string(or is it an array) is an integer...
Code:
/* 5. Write a program to convert a temperature in degrees Fahrenheit to degrees Celsius. *///##########################################################
// Created by Raymond L. Brunkow
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 or version 3 of the
// license, at your option.
//
[Code] ....
//above is were the homework ends, below is what im trying to do now.
/* Prompt for new input */
printf("
Would you like to enter a new temperature [Y]es or [N]o? ");
fgets( BUFFER, sizeof(BUFFER), stdin );
}
while ( sscanf( BUFFER, "%1s%*1s", ANS ) != 1 || strchr( "YyNn", *ANS ) == NULL );
return(0);
}
This results in the following error:
Code:
$ gcc -o hw_1_5.v2 hw_1_5.v2.c
hw_1_5.v2.c: In function "main":
hw_1_5.v2.c:52:
warning: passing argument 1 of "fgets" makes pointer from integer without a cast There is no integer there to be passed.
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Sep 9, 2014
// clang++ -g -std=c++11 main.cpp -pthread
#include <iostream>
#include <thread>
#include <unistd.h>
void thread1(void) {
while(1)
[code]....
Thread 1 does some background work, and thread2 is waiting for the user's input. If I join thread1 then the app can never exit. If I neither join nor detach thread1 then I get "terminate called without an active exception Aborted" which is not a good thing to have. If I do detach on thread1 does thread1 ever terminate? If not, how to terminate it? Also, how do I check if it's terminated or not?
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Sep 8, 2014
Code:
// clang++ -g -std=c++11 main.cpp -pthread
#include <iostream>
#include <thread>
#include <unistd.h>
void thread1(void) {
while(1) {
int i = 88 * 2;
[Code]...
Thread1 does some background work, and thread2 is waiting for the user's input.
If I join thread1 then the app can never exit. If I neither join nor detach thread1 then I get "terminate called without an active exception Aborted" which is not a good thing to have.
If I do detach on thread1 does thread1 ever terminate?
If not, how to terminate it?
Also, how do I check if it's terminated or not? -- I realize it's platform specific, I am on Linux.
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