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  • Dynamic allocation in C

    - by Kerby82
    I'm writing a program and I have the following problem: char *tmp; sprintf (tmp,"%ld",(long)time_stamp_for_file_name); Could someone explain how much memory allocate for the string tmp. How many chars are a long variable? Thank you, I would appreciate also a link to an exahustive resource on this kind of information. Thank you

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  • problem with script

    - by lego69
    I'm workin on C-Shell, can somebody help me find the bug, my script: #! /bin/tcsh -f cut -d" " -f2 ${1} | ./rankHelper script rankHelper: #! /bin/tcsh -f set line = ($<) while(${#line} != 0) cat $line set line = ($<) end file lines from which the data was sent: 053-3787837 038280083 052-3436363 012345678 053-3232287 038280083 054-3923898 033333333 052-2222333 012345678 052-1111111 012390387 I run it using: > ./rank lines why do I receive only one number 038280083 I thought cut must cut 2 field from all rows... thanks in advance for any help I expect to see second field from all rows from lines

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  • conversions in C++

    - by lego69
    I have this snippet of the code: header class A { private: int player; public: A(int initPlayer = 0); A(const A&); A& operator=(const A&); ~A(); void foo() const; friend A& operator=(A& i, const A& member); }; operator= A& operator=(A& i, const A& member){ i(member.player); return i; } and I have row in my code: i = *pa1; A *pa1 = new A(a2); at the beginning i was int how can I fix it, thanks in advance I have an error must be non-static function

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  • Why fork() before setsid()

    - by corentin.kerisit
    Why fork() before setsid() to daemonize a process ? Basically, if I want to detach a process from its controlling terminal and make it a process group leader : I use setsid(). Doing this without forking before doesn't work. Why ? Thanks :)

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  • Reading file into array

    - by Asmsycool
    Hello, I have these a file in a c program which consist of a string and 4 doubles and 2 integer in one line and there is a total of 28 lines, i want to read this file and load the data into an array. can someone help me solve this.

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  • How does ruby allow a method and a Class with the same name?

    - by Daniel Beardsley
    I happened to be working on a Singleton class in ruby and just remembered the way it works in factory_girl. They worked it out so you can use both the long way Factory.create(...) and the short way Factory(...) I thought about it and was curious to see how they made the class Factory also behave like a method. They simply used Factory twice like so: def Factory (args) ... end class Factory ... end My Question is: How does ruby accomplish this? and Is there danger in using this seemingly quirky pattern?

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  • transferring parameters in C++

    - by lego69
    hello, can I have this snippet of the code: C *pa1 = new C(c2); and I transfer it to another function: foo(pa1); what exactly do I transfer actual pointer or its copy, thanks in advance and can somebody give some info about in which cases info is copied, and in which I transfer actual pointer

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  • question about copy constructor

    - by lego69
    I have this class: class A { private: int player; public: A(int initPlayer = 0); A(const A&); A& operator=(const A&); ~A(); void foo() const; }; and I have function which contains this row: A *pa1 = new A(a2); can somebody please explain what exactly is going on, when I call A(a2) compiler calls copy constructor or constructor, thanks in advance

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  • Pin Control in HCS12

    - by Brian Lindsey
    A HCS12 microcontroller I had to buy for a class I had recently taken has 40 pins on the back side of it. The class was merely about computer organization, and so unfortunately, we never had a chance to cover all the capabilities of the chip itself. Now that the class is over, I have been thinking about using the to familiarize myself with the assembly language. I haven't found any sources that cover pin control and was wondering if anyone could possibly provide me with a hands-on pin tutorial.

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  • from string to integer (scripts)

    - by lego69
    I have this snippet of the code: set calls = `cut -d" " -f2 ${2} | grep -c "$numbers"` set messages = `cut -d" " -f2 ${3} | grep -c "$numbers"` @ popularity = (calls * 3) + messages and error @ expression syntax what does it mean? grep -c returns number, am I wrong, thanks in advance in $numbers I have list of numbers, 2 and 3 parameters also contain numbers

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  • Many network adapters at machine, need to find one that is used for traffic in Windows (from .net)

    - by viko
    My application use Web-service. I'm control from what workstation was request and for this send MAC-Address how parameter of all methods. But then I start testing application in real, I found workstations which have many network adapters - Ethernet, Wireless, Bluetooth. When I get MAC-address using next code: var networkAdapters = NetworkInterface.GetAllNetworkInterfaces(); if (networkAdapters == null || networkAdapters.Length == 0) return string.Empty; string address = string.Empty; foreach (var adapter in networkAdapters) { var a = adapter.GetPhysicalAddress(); if (a != null && a.ToString() != string.Empty) { address = a.ToString(); break; } } return address; Sometimes Web-service receive from workstation different MAC-Addresses, but I want get always only one MAC-address. Please, help me.

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  • Minimum range of 3 sets

    - by user343882
    We have three sets S1, S2, S3. I need to find x,y,z such that x E S1 y E S2 z E S3 let min denote the minimum value out of x,y,z let max denote the maximum value out of x,y,z The range denoted by max-min should be the MINIMUM possible value

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