15,555 Topics
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| | Hi, I want to take a command with its options as input and execute it with one of the exec() functions. My approach is to take input first and put it in an array by dividing with string tokenizer. Then I call execvp() which takes the array including the command … |
| | I'm relearning (OK, "learning" would be a better term since I never really understood it the first time) piping. My end goal is to execute some shell commands like "ls", get the results into another variable, and do some stuff with it. I imagine I'll end up using commands like … |
| | For this content of the file/stdin: [CODE] a 3 W 10 A 100 , 10 k 7 . 3 I 13 [/CODE] I have written the following code [CODE] while (k-- > 0) { scanf(" %c %d",&c, &p); printf("c: %d p: %d\n",c,p); } [/CODE] if I change the format string …  |
| | When you have a function and need to scan for 2 different numbers, should the scanf be in the function or in the main() and why? |
| | Could someone explain where and when you would use << and >>. I read these 2 articles but don't really understand them. [url]http://en.wikipedia.org/wiki/Operators_in_C_and_C%2B%2B[/url] [url]http://en.wikipedia.org/wiki/Arithmetic_shift[/url]  |
| | With my code below how would I either ignore or remove decimal numbers? I tried typecasting it but that messed up my code. I can't think of any way to make a loop to accept only integers either :(. I don't understand why the scanf is accepting decimal numbers when … |
| | Hi all, I have to make a function which take as parameter two arrays and merge in one new. For example int array1[][] = {{1 , 2, 3, 4}, {2, 3, 4, 5}}; int array2[][] = {{5 , 6, 7, 8}, {6, 7, 8, 9}}; To take as result arraynew[][] …  |
| | Can someone tell me why my compiler won't compile this code and how to fix it? [CODE]void gcd(int x, int y) { if (x > y) { int c; while(1) { c = x % y; return y; x = y; y = c; } if (y > x) { … |
| | I'm new here so please bare with me if this is the wrong forum (sorry if it is). I put it here because I believe you can contruct a kernel in c right? I've downloaded the linux kernel and thats full of c source files. Anyway, i've been using windows … |
| | Hey, my friend and I made this website: [url]http://www.letslearncpp.forumstech.com/[/url]. This website is complete with text and video tutorials made by my friend and I. Please visit this website and join it if you want to. Thank you. |
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| | [b]Split from - [url]http://www.daniweb.com/forums/thread118867.html[/url] [/b] [code] int main() { int i , parent_id , ans ; parent_id = getpid() ; for ( i = 1 ; i <= 5 ; i++ ) { if ( getpid() == parent_id ) { ans = fork() ; wait() ; } if ( ans …  |
| | I need to parse a file line by line and check if the line is in a valid BNF format and print it out if it is. Below is my BNF grammar: <line> ::= <program names><spaces><uids><spaces><dest IPs><spaces><ports> <spaces> ::= <blank character> | <blank character><spaces> <blank character> ::= ' ' | …  |
| | Good day. I need help on a program that I'm working on. It's supposed to take the strings in input.txt and put the odd numbered lines to odd.txt and the even ones to even.txt. here's the code I have made so far... [CODE] #include<stdio.h> #include<stdlib.h> #define p printf #define s … |
| | Hello, I'm trying to split a string into 4 separate strings using a delimiter "\n" The initial string is: "/usr/bin/ssh \n * \n 147.188.195.15, 147.188.193.15, 147.188.193.16 \n 22" I would like it to be split up into four different char's so that char *programnames = "/usr/bin/ssh \n" char *uids = … |
| | Here is the output for the following code. Can someone help me put the five prods on rows and sales reps on columns w a few changes??? Enter seller's code (-1 to exit): 2 Enter product code: 2 Enter sold for seller 2, product 2: 2 Enter sellers code (-1 … |
| | [code=c] int main(int argc, char* argv[]) { int a=3,b=2,c; a=a==b==0; printf("%d\n",a); return 1; } [/code] I cannot understand why this code gives 1 as the answer. According to me , this should be the order of evaluation b==0, which gives false & the expression becomes a=a==0 this should again give … |
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| | A program that handles either piped input (command/prog | your_prog) or file redirected (your_prog < file_name) input. Determine whether such input exists before issuing a stdin read so that the program does not go into a "waiting for input" state. Written in/for the XP environment. |
| | two static arrays size 10 need to be copied to an empty target array size 20. like this: you copy from the first array the nums till arr1[i] = 0 then you switch to the second array and copy to the nums till arr2[i] = 0. then you switch back, … |
| | Iam a freshmen and we're given a task to program a calendar using turbo C and does'nt exceed line 54 and some texts are with specific colors.(red) for the days under sunday,(light gray)for the month.... I will really appreciate your help thanks....... Here's the format: ex: enter month:1 january 2004 …  |
| | I have gotten my program to the point that it allows me to enter the data I want to enter. However, I do not know how to get the program to loop back correctly and ask for salesperson number and stop the loop when I enter -1. Help![CODE] #include <stdio.h> …  |
| | deleting string... example: deleting... enter string: the quick brown fox and the lazy dog. enter string to delete: the([I]the first one[/I]) new string: quick brown fox and the lazy dog.  |
| | Hello all, I have a program that creates an array of structs. It is consistently exhibiting 1 of 2 problems and I can't figure out exactly what is wrong, but the problems seem related to each other. Problem 1: For some reason the category member of the mediaItem struct fails … |
| | Hi, Im trying 2 write the contents of a input file to an output file in reverse order using file I/O in C. Is there a more efficient way 2 do it? [CODE] int main() { FILE *fp1,*fp2; char ch,arr[100]; int i=0; if( (fp1 = fopen("input.txt","r")) == NULL ) { … |
| | Hello, I am attempting to rewrite a program in c. Here is what I have so far. Thanks in advance for assistance. [CODE]#include <stdio.h> void sales[ salesPerson ][ product ] += value; int main() { const int PEOPLE = 5, PRODUCTS = 6; double sales[ PEOPLE ][ PRODUCTS ] = … |
| | I am unable to print out the error message when there is no input. I've tried different methods for it, but I can't get it to work. What am I missing? print should be: p2 invalid input but I get: p2 segmentation fault when I do this with an int … |
| | I have been trying to get the day of the year into an int(0-365). I have tried the time.h library and did int tm_yday but it returned an incorrect number. I am using Linux. G++(gcc) compiler. Thanks for the help. |
| | Hey all, I'm writing a program in C++ for a contest. The code executes no problem on my computer at school that I'm writing it on. I get all the correct answers. When I upload it however, it keeps on saying "runtime error (SIGSEGV)" Please Help!! here's the link to … |
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