C/C++ :: Operating System Written Can't Print Out Lines?
Nov 12, 2014
I'm taking an operating systems class and I'm trying to write a script that would execute a program in Simple OS.I"m not sure if this is the right place for this because although the entire OS is written in C, "asm" are assembly language code. Anyway when I run the OS in virutal box and try to run a program, I get a "Fatal Execption" in a loop until the entire OS crashes. So then I try to debug my code BUT when I add printf statements and try to run the code again I don't get to the "fatal execption" and the entire OS just crashes. 1) why can't I add print lines? 2) what's going on with the fatal execption?
////////////////////////////////////////////////////////
// Loads program and executes it in user mode
//
#include "kernel_only.h"
Write a program that prompts the user for the name of a file. Then it opens the file, and counts the number of words and lines in the file, and prints out those counts.
I think I possibly could somehow use a counter to increment using getLIne() until getLine() returns NULL, but the problem is, I'm worried if I try that, a file that looks like this:
Bla bla bla bla bla lkfdljkfaklafdskjladsjkdfkjlkdfjdfshafdsjkjrerjkkjfaddjkfsafkjdjakdfsjkasfjkjkfdskjldfjkfjkdjfkdsakdjfkjfdkjdfskjfdsk jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjdfkerea blkjadkjlfdskjldfkjlfdkjfdjkdfsjkldfskljfksfdljfd
Only register four lines and not get the one after the fourth line.
Im trying to figure out how to print a random number of asterisks on two separate lines at the same time. So every time you press a key it prints a different amount of random number of integers between1 and 10 until one of the lines reaches 70. I have the code to do one line but can't figure out how to do two at once.
#include <stdio.h> #include <time.h> #define MINR 1 #define MAXR 70 #define MINM 1 #define MAXM 10 int main (void)
how to ask the user to input operating symbols like "+","-","*" and then use it to operate on the numbers. The user should be asked to input the symbols not like this
I am working on extending an application that features a (rather old) plugin system. The plugin system is designed to work on x86 only, but support any and all compilers on windows, linux and also OSX.
My goals are now to
1) extend the plugin framework in a backwards compatible way 2) port it elegantly to x64
So far so good.
The plugin subsystem essentially exports a bunch of SDK function like this:
Code: extern "C" CDECL int somefunc(int a, int b);
Which can be used by the plugin, and expect the plugin to export some function in return. When a struct is supposed to be send to the plugin, the syntax of the system goes like this:
Code: extern "C" CDECL int RequestStructField(int field, int structhandle);
So the struct isnt handed over via a pointer, but every field has to be requested individually! From what I can tell from the comments, the developer was afraid there might be problems exchanging structs between different compilers, alignment and all.
I would like to tear down this limitation, and pass pointers to structs to plugin directly. Or better: allow the plugin to give me a pointer to an empty struct which i subsequently fill.
However, i have no control over the compiler or language used to write the plugins. Quiet some plugins are written in Delphi, some even in MASM ... both would have to support this way of passing structs.
the question is: does that work?
I have looked at other plugin systems, but they either use entirely different ways (XPCOM) or are limited to a single platform or compiler.
Some of them have a note stating that the plugin must be compiled with "byte-aligned" structs.
x86 and x64 plugins are two different stories, x64 version of the app does NOT have load x86 plugins. I dont expect there to be too man problems (right?). But we'll see, i guess.
i want to know how to copy data from already written text on console?
i am actually making a program that reads texts already printed over console so i want to capture that data again but i must not have a copy version of every thing behind the scenes i.e. in the background. I need to know how to capture data or amount of some data from console output? for example:
[console started]
It's imaginative console for the purpose of understanding.
I will make a very impressive program which will wow! you and to my instructor. |
[/console ended]
Now i have no copy of any data printed on console/command prompt or whatever you say it. My question is how can i copy following strings from console?
1) It's imaginative console for the purpose of understanding.
2) It's imaginative console for the purpose of understanding.
I will make a very impressive program which will wow! you and to my instructor.
3) very impressive program
4) understanding.
I will make
NOTE: Small bold '|' is my most recent cursor position on cmd.
Moreover in case you need about my IDE, i am using : Windows 7 Ultimate Service Pack 1. Microsoft Visual Studio 2013 Ultimate. Architecture 64bit.
Here is a working C++ program and its output that reads the names of a certain number of functions whose names are written in a disk file that provides the control parameters in a near-real time fashion. Based on this information, the program calls those functions whose names were given in this text file as parameters. The method I have used is to build a map of functions that connects the names of the functions to the actual functions. Once this map is created, then it is very easy to iterate in such a way that only those selected functions are called.
So far this is working well, and it makes the logic of the code easier because ultimately there will be a large inventory of functions (probably hundreds of functions), and this way of pre-building a map of functions avoids writing hundreds of if statements in the code. Of course, pre-building this reusable map in the background is still equivalent to writing that many if statements, but at least it makes the code very compact and much more automatic, since it is done only once.
But I now have a related question: In this case (when the selected subset of functions to call is given as incoming data as in this example), does C++ make it possible to avoid using maps of functions, by directly applying the string variable that holds the name of the function in order to call the original function immediately For instance, if a string variable s = "MyFunction", then is there a more direct way of using this string as if it were the actual function whose name is spelled exactly in that way? This would make the code even more compact.
Here is the sample test code for the map of functions, and its output:
First of all here is the text file "FileForNamesOfFunctions.TXT" that contains the part of the "data", which is the set of functions select from from the inventory and only call these:
Code: function2 function3 function5 And here is the C++ code that uses this "data":
i cant display the data written to this file in a switch statement (case 2) what am i doing wrong..the file data is being written into the text file but i cant display it
I've found that with streamwriter(sw) the data isn't displayed with the written to document until you either leave scope or use sw.close I'd prefer to keep sw open as I will be writing to the file in and out, sometimes very frequently, but would also prefer the data to be viewed in real time. Is there an efficient way of going about this?
I've written a simple program, which asks the user to respond to a YES or NO question using the character Y/y for YES and the character N/n for NO. The foundation of this program is based around several IF statements implemented to aid in finding the ASCII value of the character entered before invoking the corresponding cout statement that informs the user which character they entered. My Question: How should a program be written to deal with ignoring case sensitivity in regards to the users' input?
Here is my amateurish attempt,
Code: #include <iostream> using namespace std; int main()
[Code] .....
The following are IF statements written for the program to determine whether the user answered YES or NO. The program then performs the cout statement that contains the corresponding character to the ASCII value found.
I'm writing a program that writes to a report in a text file. It uses a struct but with no array. How can I write this so that the report comes out as it should because as of now after i removed the brackets from record which is the variable of the struct my report isn't printing right.
I am trying to write a client/server application that takes input to an array of structures from the user,stores the data in a shared memory segment and then writes the same to a file when I close the application. How do I get started? And how do I ensure that the server stores the data correctly? Also, the server needs to be a concurrent server that accepts connections from multiple clients.
User enters sentence "The Smiths have two daughters, three sons, two cats and one dog." (The numbers may change depending on what the user chooses to enter. He told us the range would be from zero to nine.) and we have to convert the written numbers within the sentence into actual decimal numbers and print out the new sentence. Ex. The Smiths have 2 daughters, 3 sons...etc.
I have written the following bit of code which reads the string and finds all the "written numbers" but I am not sure how to proceed from there. I am stuck on how to print out the new sentence with the converted numbers as my professor mentioned something about creating the new string using dynamic memory allocation.
Code: #include <stdio.h>#include <string.h> int main () { char A[100]; int length = 0; int i;
I am making a program where the user enters numbers into an array and then a number,x. The array is sorted, then x is inserted into the appropriate place. I wrote my selection sort
Code:
void Sort(int ary[], int size) { int temp; int smallest; int current; int move; }
[code]....
put it wont print the numbers sorted when I use my print function, just the unsorted numbers.
Well, I have a .txt file that contains, together with a few characters, columns of values that I want to save in different files like is written in the program (file 1, file2, file3 - a with x, b with y, c with z). BUT, I don't want the values from the lines with the saying "interpolated_vector" to be printed in any of the three files.
What I have is the code below, that has the code that creates the three new files with the columns of values that I want. It is working fine!
Code:
#include <malloc.h> #include <stdio.h> #include <stdlib.h> int i, count; double *a, *b, *c; double *x, *y, *z; char tag[5][255];
[Code]...
I've tried and tried, but couldn't make it work properly. I could only erase one line with "interpolated_vector" using fgets, but all the other lines below this were printed into the three new files (file1, file2, file3).
I want to write a function called DrawLineSegments.This function must change the color of lines at every corner where the corner angle is greater than 60 deg (Assume that there is a function called checkangle). The color sequence must be black, red, green, blue, and repeat this sequence after the fourth color.
How I would go about counting lines from a file at the same time as extracting words? I need to know the line number to output what line the word is misspelled on. I tried getline and using sstreams but I could not get it to work.
