[c] Forum Topics

in our college we have a repeated C aptitude question... which goes like this.... [code] int i=5 printf("%d %d %d", i--,i,i++) [/code] and the answer given to us was 5,6,5.... when asked it was said that the compiler evaluates printf from right to left...... can somebody throw some light on …

what is local variable ???? what is it function for ???

hey everyone Well currently I'm on a very long holiday and I'm trying not to waste my time doing nothing . So can any one tell me where I can get some tasks or anything to tell me what to implement ?? so that I can learn new things in …

How to implement sizeof api. Means sizeof is already there but i do not want to use that. Major question is .... If i want to use size of int. than i can get by pointer but do not know in the case of array of int. I think that …

void quick_sort (int *a, int n) { if (n < 2) return; int p = a[n / 2]; int *l = a; int *r = a + n - 1; while (l <= r) { while (*l < p) l++; while (*r > p) r--; if (l <= r) { …

hey starting data structers through pointers , i don't know how to reverse a singly linklist? pls help

I made the following functions for deleting a node of a singly linked list. 1. Can these functions be improved furthur? 2. Is it necessary to free the memory of the node that is deleted? nodep deleteByValue(nodep p, int value) { nodep temp = p; if(temp->data == value) return temp->next; …

need help !!!! anyone know how to draw a christmas tree in c program with 3 for loop ????????????

Why does the following snippet produces different result than expected? #include <stdio.h> int main() { int i = 5; printf("%d %d %d", i++, i++, ++i); getchar(); } I compiled and run this code with Visual C++ 2010 and it produces the output 7 6 8 instead of 7 6 6 …

I am wrote a program that generates 20 random numbers from 1-99 and put them into an array. I am trying to sort them with a bucket sort, but I can't figure out how to do it. I have searched google and yahoo for information but everything I find just …

Hi everyone. I wrote the following code: if the number entered is even ie if n=6 , the column of # should be at the 3rd column (ie 6/2) if the number is odd ie if the number is 9, then the column of # should be at the 5th …

Pascals Triangle

hi i am programming for about 4 years and i want to learn how to make a operating system. for ex window, mac or unix. And i am think of storing it on a disk. I have no idea how to get started. can any one tell me the steps? …

Hi Everyone, Could any one provide some complex questions in C Shell Scripting as i need to conduct lab exam in scripting in 2 weeks, i have searched in google but i found only very small programs so could anyone provide some advanced shell scripting questions so that i could …

For my OS lab we have linux at college and the question is to find the factors of a number and pass it use pipe function from child to main process. I googled up the syntax of pipe and I find it difficult to understand the idea. You need a …

My Ubuntu version is 12.04. I'm simply trying to include GL/glu.h in my program, but I get the error: `fatal error: GL/glu.h: No such file or directory` I include it like this: `#include <GL/glu.h>` I have libgl1-mesa-glx-dbg, libgl1-mesa-dev, mesa-common-dev all installed.

Hi everyone, I was wondering if anyone could help - I'm trying to split up a char* that contains a string, something like "*Stephen*10:11:00*02/07/2012*Hi there" I'm trying to split it up so it gets the position of the first * then the second, and stores whats between them in name …

Hi, Anyone suggest/Explain code optimization, time complexity of program. I came across Big O(n), Big O(...). can anyone explain what these means and how to find these for programs. -- Thanks in advance

To Check Wether the 3 Points are Collinear or Not.

Hi, I'm trying to make a simple applet that will display battery status using gtk+ . For that purpose I have written code given below. It continously check for battery status using acpi command and display it. Do you think that I have done things in proper way? I want …

Wether Given three sides a,b,c Form a Triangle or Not

To Find the Prime Factors of Given Number

To Check Whether the Given Point P is inside a Triangle or Not..

i want to append a node in the linked list when i append this as struct node*p; p=NULL; append(p,1); where function is declared as append(struct node*q int num) i append three node, after this i call the function for counting the node, i get the total no node is 0, …

I have this code, but when i type in one comand and then the next comand it does doe the comand i type in but the first comand i typed in. * I think it is becuase i dont clean my vector string, if so how do i clean it. …

this program is to find the largest palindrome of 3 digit numbers.this code is workig for two digit numbers but it is not working for 3 digit numbers. `` #include<stdio.h> #include<conio.h> #include<math.h> void main() { int i,j,con=0; long int num=0,res=0; clrscr(); for(i=999;i>900;i--) { for(j=999;j>i;j--) { num=(i*j); con=pal(num); if(con==0&&num>=res) res=num; } …

Hi, I am running Ubuntu 12 on Virtual box and I am using GCC to compile this simple C program that has simple OpenMp pragmas : #include <stdio.h> #include <omp.h> #define MAX 10000000000 void main() { unsigned long long i,j,k,l; int threadnumber; #pragma omp parallel shared(i,j,k,l) { threadnumber = omp_get_thread_num(); …

Hey there, I'm having issues with a custom string tokenizer I'm using for an assignment. I've looked around and haven't managed to find anything that really answers my question, so here goes nothing. Whenever I run the program and it runs the tokenizer, I get a seg fault. I'm fairly …

what is comparision of linklist? when i read this question , arises two option 1.either compare value of each element. 2.just compare the length of both the link list. pls help which one is right approach to solve the question.??

hello friends... **1**. struct node *p; p=malloc(sizeof(struct node)); **2**. struct node *p; p=malloc(sizeof(struct node *)); what is the difference between 1 and 2 code :) pls help

hello friends, i have some problem with the concept of singly link list,,, don't know how to read it backward pls help

hello!! i was working on a small software a few days back which allows a user to login through the interfaceand see the topics inside the program. But how toavoid mis use of it??? if a person gives the software to some one else giving his user name and password …

Hey, Is there any difference between the 2 syntax, ie, str = "This is a test"; and strcpy(str,"This is a test"); I think, both of them, malloc some random 200 addresses, and give the starting location of the 200 chunk to the pointer variable 'ptr'. #include<stdio.h> char* str; int main(void) …

*i like to study c programming from its basis to full., any website for c tutorial with simple and full contents? i search in google but no get a good site.*

void insertion_sort(int *a, int n) { int for(i=1;i<n;i++) { value=a[i]; for(j=i;j>0 && value<a[j-1];j--) a[j]=a[j-1]; a[j]=value; } } can anyone pls explain me the flow of this code... i am having confusion in understanding the flow..

Hey, Is there a way to know the contents at address 6295600(say) in C ? I don't want to do using a pointer, that is, something like printf("%d",*p); int a = 5; p = &a; and address of a = 6295600. I want to be able to do something like, …

How do I print out the address a pointer is holding. Currently I'm using the code pasted below. But I'm getting this error. Error: t.c:13:2: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 2 has type ‘char *’ [-Wformat] Code: #include<stdio.h> #include<malloc.h> #include<string.h> #include<stdlib.h> char* str; int …

Inspired by some C and C++ threads regarding finding a specific pattern in a file.

void selection_sort (int *a, int n) { int i, j, m, t; for (i = 0; i < n; i++) { for (j = i, m = i; j < n; j++) { if (a[j] < a[m]) m = j; } t = a[i]; a[i] = a[m]; a[m] = t; …

**Bold Text Here* what is the code for performing mathematic calculation based on BODMAS rule in C*(such as 6+6/2=9) ,any suggestion ,plz??

hello friends, i have read a question about pointers and seems totally new concept for me .. how would you find out if one of the pointers in a linked list is corrupted or not? pointer is corrupted ??,, don't understand :( pls help your friend : sparsh

hello friends, i m doing programming in vc++. but while making a basic program of link list facing a problem. when i try to add aaloc.h file it turns into atlalloc.h. there is no file as alloc.h. #include <stdio.h> #include <atlalloc.h> struct node{ int data; struct node *link; }; void …

Hey I am trying to find a way for the user(not the programmer) to determine how many decimal places a number will print out to. I have tried pointers, precision mods and even a sub program to bypass my lack of knowledge in this area. Any help would be greatly …

#include<stdio.h> #include<string.h> void recurse(char [],const char *); int main() { char *charset="abcdefghij"; recurse("",charset); } void recurse(char str[],const char *charset) { int len; len=strlen(str); strcat(str,charset[len+1]); if(len<strlen(charset)) recurse(str,charset); printf("%s",str); } Like the question says, what is wrong here? This is the logic of my program 1. Keep a string called charset which …

Am I freeing and declaring this 2d array correctly? int **ratings; ratings = (int**)malloc(sizeof(int *) * (numCouples*2)); for(i=0; i<numCouples*2*numCouples;i++) ratings[i] = (int*)malloc(sizeof(int) * numCouples); //Data is read into each array position for(i=0; i<numCouples*2;i++) for(j=0;j<numCouples;j++){ fscanf(ifp, "%d", &ratings[i][j]); //printf("%d",ratings[i][j]); } for(i=0;i<(numCouples*2);i++) free(ratings[i]); free(ratings); Thanks Drew

Hi their, I am learning C and a bit stuck on pointer to strings(I now they dont really exist in c but yeah) which i saw in the absolute guide to c programmig book. I am wondering why this code below doesnt work? If you could answer this question it …

Help me plz #include <stdio.h> int main ( int argc, char *argv[] ) { if ( argc != 2 ) { printf( "usage: %s filename", argv[0] ); } else { FILE *file = fopen( argv[1], "r" ); if ( file == 0 ) { printf( "Could not open file\n" ); …

Hi, # Problem and Background # I'm trying to compile a program that uses some legacy c code generated using the f2c translator (*version of May 1991 13:06:06*). *decide.c* is the source that contains the translated fortran to c code and *f2c.c* is the header file. Durring compilation I get …

Hi, Can i ask some help what is the best editor to use in learning C language.... By the way which is which language, should or i must to learn C or C++ ?. Thank you in advance.

I want to make a simulation of logic circuits using basic logic gates in C.User will determine the types of inputs, and the gates.I want to design the circuit as a result.And simulation that produces output according to input values​​.But I can't do connections between gates.Can you give me advice …