[c] Forum Topics

Can you help me for the following problem: Implementation of a program in C that solves the problem of competition between the four processes that share the source of the network card with the semaphore method

I had to write a program that finds out whether a matrix is Skew-symmetric matrix or not...well my code is a disaster I seek help in this matter. In which way can I write this code to make it eficient,short and smart? this is my code (yet again it;s a …

Hi, I've been trying to learn what pointers are and how they function, and I now finally understand most of it. However, I don't understand the assignment of strings to a char *, and what the values they have mean. I wrote a small program to learn: [CODE]#include <stdio.h> #include …

I am working to take c code from an academic paper and edit. I am studying cryptographic algorithms. I have ran the following code, but I am having a little difficulty understanding two things. First, the program uses unsigned long ints. When they are added or subtracted, I don't get …

hi , I was trying to open a file using fopen() method. It's not opening all the time. some time it opens but the other time its getting crashed.... FILE* tmpfile = fopen(xxxxxx, "r") this is the code i am using.... and every time the value of xxxx is coming …

Hello! I have a problem. I can't use scanf() to set a value of the second member of the person struct. Why? I get an error that tells me "bad access". [CODE]int main(int argc, const char * argv[]) { struct Adress{ char *street; char *postal; int zip; }; struct Person{ …

[CODE]#include<stdio.h> //#include<conio.h> //#include<string.h> #include<string.h> //#include<iostream.h> int main() { char al[28],b[104]; int i=0; int t,k=0; // b[0]='A'; scanf("%d\n",&t); while(t--) { // scanf("%s",b); gets(b); gets(al); //gets(al); //printf("%s",b); //puts(al); // scanf("%s",al); // for(k=0;c1!='\n';k++) // { // scanf("%c",&c1); // // b[k]=c1; // cin>>c1; // b[k]=c1; // } // printf("hello"); // puts(b); // gets(b); // …

Hello...just started learning C and i'm trying to write a program that solves quadratic equations...but every time i compile and run it and enter the 3 variables it crashes. I kept on looking but didn't find anything wrong with it...help? :P [CODE]#include <stdio.h> main(){ int a,b,c; float x1,x2; printf("Please enter …

Hi Programmers, Please help me, i was wondering on how to create a simple phone book program using struct array to insert a new contact, update an existing contact, delete an existing contact and to display the contact information

I have a C-code written in turbo C. I want to make a standard exe file that can easily run on any other PC as well which doesn't have TC installed. I have to provide my client simply an exe file which continuously monitors the serial com port for some …

I read through all previous post regarding quicksort on a linked list. The trouble I am having is using a random element, it seems all the other post are using the first or middle element where I want to use a random element for the pivot. in anycase here is …

I've been trying to figure out whats wrong here, but I just can't wrap my head around it. My compiler outputs the following when I attempt to compile it. [CODE] z:\Desktop\tmp\proj4>cl proj4_linkedlist.c Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 16.00.40219.01 for 80x86 Copyright (C) Microsoft Corporation. All rights reserved. proj4_linkedlist.c …

Please hep me with this problem: I am having a problem with string handling using c language. This is actually an assignment. Here's how the whole program must work: 1. User must input a [B]valid password[/B] 2. Once the user inputted a valid password, it will access to an employee's …

I need help fixing this one error with my code. Below Im going to upload a piece of the code which im having problems with and the output error . [CODE]int main() { int vals[100]; fstream file; string line = "----------------------------------------------------\n"; string msg2 = " Please select an option from …

Recently I started learning c and was experimenting with arrays and passing them between functions. Now I have written a simple piece of code which has two functions one for generating random numbers and putting them in an array of size 50 and one function to display the contents of …

[CODE]#include<stdio.h> #include<conio.h> int main(){ float Area; float r,h; #define pi 3.41; printf("enter the radius of the circle in centimeters\n"); scanf("%f",&r); printf("enter the height of the cilinder in centimeters\n"); scanf("%f",&h); Area=(pi*r*r)+(pi*r*h); printf("THE AREA OF THE CILINDER IS:%f",&Area); return 0; getch(); } [/CODE]

how can i go back to the previous line if user enters a wrong input, im using C programming

So this program is supposed to take in a sentence and output it with correct spacing and capitalization. -For example if I entered: heY, How are You doing? -the output should be: Hey, how are you doing? The program runs fine, I just cannot get it to output. [CODE]#include <iostream> …

hi everybody! :) I have 4 tables in my mysql database as user car_description techniqual_description saled_serial_numbers In user table user_name is the primary key. In car_description there is car_id as primary key and serial_number as foreign key which is primary key in table saled_serial number and user_name as foreign key …

I am kinda new to world of c programming, and i have been assigned a problem that is written as follows: Write a procedure that counts the number or words in a string. Write a program to test your new procedure. I am kinda lost on this completely. Any help …

Hi All, I have read that the system call "execlp" will take the first arguement as the file name(or path), second arguement as the command and all others are arguements to the command terminated by NULL. i have written below program. [CODE] #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <sys/types.h> …

Hello everybody, I am trying to write a program consisting of two parts: 1. It lists of letters before and after a certain letter (if the user requested 2 letters regarding 'e', it would be cd and fg) 2. count the number of letters in each word of a sentence …

Hello I'm working on a project, and I have the following classes: [LIST] [*]Loader - This loads the contents of the text file [*]Matrix - This processes the data that has been loaded [/LIST] Now I'm using association, Loader -> Matrix In my matrix class I have a method that …

I'm trying to improve the validity checks in my program, but no matter what I do, I can't seem to come up with one that catches the following: 1) If you input "enter" "enter" the program reads it as a valid anagram. 2) if you input all number "33467" "22113" …

I have an array of structures: [CODE]typedef struct { char name[20]; int ID; int status; } seat;[/CODE] Then, basically, I'm trying to print out the list of empty seats in a reservation system. [CODE]void listEmpty(seat plane[MAXCAP]) { int i; for(i = 0; i < MAXCAP; i++) { if(plane[i].status == 1) …

Greetings, this is my first post here but I will try to do it correctly. I know this specific question is a common one, but I am not looking for someone to do it for me, I just need someone to help me out a little. I understand the basics …

i m trying 2 find all primes between 2 nos using sieve. but somehow only 2 is being set as prime, pls help me in finding the problem [CODE] #include<stdio.h>//1==t for prime #include<stdlib.h> #define MAX_LIMIT 100 char flags[MAX_LIMIT+100]; void set_seive(void) { /*setting of flags for prime nos. by sieve of …

Hi everyone, I'm currently working on a cross-platform project to copy data from the computer onto a USB drive quickly. [B]Main problem: EOF in the middle of the file[/B] It's going good so far, but I stumbled across a problem in my copy_file function: [CODE]int copy_file(char *source_path, char *destination_path) { …

I've read many threads on how to remove a new line character '\n' using fgets()-- however, how would one go about removing a new line character simply by using getchar() ?

Good day, can you give me some sample program that hold string in 3 dimensional array.. because our instructor didn't expound the discussion about multidimensional array then is it useful in our final project this semester..Hoping for reply Thank You

[code]main() { int a=5; a=++a + ++a; printf("%d",a); }[/code] the output is 14..how come?

So the project is to write a program (for a beginners C class) that compares 2 words and see if there anagrams of each other. I'm about halfway through the program and it was working fine until i tried to add the IF STATEMENTS with isalpha. What I'm trying to …

Please help to make a code of the josephus problem in C using the circular linked list.

When my os starts and i log in, the Network Manager displays a list of available networks. How can I code a C program to get a list of avaialble networks. Arp requests? What is the protocol?

Hi All, Why my QueueUserWorkItem is not at all working. My code is here: [CODE] typedef struct { PCHAR URL[MAX_URL] ; PCHAR DestinationPath ; }MAINDATA, *PMAINDATA ; int main(int argc, char * argv[]) { PMAINDATA pData ; BOOL bQuwi ; DWORD dwIndex ; PCHAR pURL ; pData = (PMAINDATA)malloc(sizeof(MAINDATA)) ; …

[CODE]#include<stdio.h> #include<string.h> void main() { char str[20],cmp[20]; int x; printf("enter the string : "); gets(str); printf("enter the string 2 : "); gets(cmp); x=strcmp(str,cmp); printf("%d",x); } [/CODE] my doubt is how strcmp returns an integer ??how will it take the words

i found this code in a book. i am finding it confusing. [code] #include<stdio.h> int main() { int arr[3]={2,3,4}; char *p; p = (char*)arr; // line A p = (char*)((int*)p); printf("%d",*p); p= (char*)(p+1); //line B printf("%d\n",*p); return 0; } [/code] the answer is: 2 0 but i cant figure out …

I'm trying to design Programmable Logical Array using c language. Due to lack of time I downloaded code for tabulation from internet. Now I have modified it to return f and f' in a character array. It works fine for some functions. But it shows memory allocation problem for some …

[CODE] sem_t w,r,s1,s2,s3; pthread_mutex_t m; int main(int argc, char* argv[]) { mutex and semaphores initialization ..... call threads.... wait until finish and cancel threads... clean threads and semaphores [I]exit;[/I] } void *reader(void *argv) { while(TRUE) { sem_wait(&r); sem_wait(&s1); pthread_mutex_lock(&m); ... read data..... pthread_mutex_unlock(&m); sem_post(&s1); sem_post(&w); } printf("Done read\n"); sem_post(&extra2); pthread_exit(NULL); …

[CODE=c]int OperateGumBallMachine(void){ int total = 0; char input = getchar(); RefillGumBallMachine(); for(input; input != 'x'; input = getchar()){ if(gMachine.iNumBlueGumBalls + gMachine.iNumGreenGumBalls + gMachine.iNumRedGumBalls == 0){ RefillGumBallMachine(); } switch(input){ case 'n': total += NICKLE; if(total >= QUARTER){ total -= QUARTER; DeliverGumBall(); printf("Your change is %d cents\n", total); total = 0; } …

I have some code in C++ that uses an std::vector of std::strings to store an array of strings. I need to convert it into C. I thought that I would just create c versions of the functions I need (vector.back,vector.push_back,string.operator+=) but am getting lost in the double pointers. Can anybody …

If I mprotect a segment with PROT_NONE and if a SIGSEGV occurs due to a write which gets handled by sigaction with sa_sigaction, We will be able to find the address where the fault occurs using siginfo_t's si_addr. Is there a way to know the data that was tried to …

This version1 of the code is a recursive function to print n to 0 values, but there is no return statement, is it using the return value of printf The version 2 of the code prints from 0 to n,and it worked even if we remove the return keyword as …

I am trying to write this code, but I am having problem with using floating point in the while. The code works, but when I input the number, I get some strange result. What's wrong? [CODE]#include <stdio.h> #include <stdlib.h> int main(int argc, char *argv[]) { int hourWorked; double hourlyRate; double …

I wanted to create a simple table by printing lines in between my values with a header at the top and my numbers left justified. However, when I get to a ten digit number or larger, my code seems to break and my count variable goes to zero as far …

[CODE]#include <stdio.h> #include <string.h> int main() { int count = 0; char *doc; FILE *inp; printf("Enter the file name: "); scanf("%s", doc); inp=fopen(doc, "r"); while((doc = fgetc(doc)) != EOF) { if (doc == ' ') count++; } fclose(doc); printf("%s contains %d words\n",doc,count); return 0; } [/CODE] So basically I'm a …

Hi everybody. I'm trying to write the program that will read the file and delete blank spaces ONLY after the text. here is the text : [CODE]serg@serg-PORTEGE-Z835:~$ cat sample.txt Now is the [/CODE] here is the the same in hex: [CODE]serg@serg-PORTEGE-Z835:~$ od -x sample.txt 0000000 2020 2020 2020 2020 2020 …

Hi everybody. I'm new in C and would like to know how to delete last elements in the array? lets say I have array arr = {1,2,3,4,5} and whant to delet last two elements. is it possible to do?

I have a problem with sockets. I am using this code in java as the client: [CODE] class Javaclient { private static DataInputStream input; private static PrintStream output; public static void main(String argv[]) throws Exception { int PortNumber = 4321; String line; BufferedReader in; Socket MyClient = null; try { …

Hello all.... Sorry if this is extremely simple and stupid but I was taking a look at the Forgers32 manuals just to have a poke at the win32 api. I was able to get his first example working to pop up a basic window but for some reason the title …