Beginners - C++ Forum - September 2009 (Page 4)

why isnt this string of code working

cout << "The absolute value of\t" << a << "is\t %lf", fabs (a); a is the variable

[2 replies] Last: Kind of a mix of Python and C you've got there... (by Duthomhas)

How does std::map construct complex objects?

How does std::map construct complex objects if no constructor is written for it? class Complex{ float a,b,c; }; void main(){ map<int,Complex> Tes...

[3 replies] Last: It will. If you do something like: int a; , then a is not initial... (by firedraco)

by beginner at programming

learn C++

Where is he best place i can learn in depth C++.

[1 reply] : In your comfy chair at home, front of your computer... If you are a... (by R0mai)

by meesa

C++ Detect Buffer Overrun

So here is what I have: The user enters a number into an int. Now, I've solved if the user enters a character first, however, if there is a number first, I c...

[8 replies] Last: Okay, I got a solution. I added a boolian, and set it to false. Then,... (by meesa)

by Qwerty2

What can C++ do?

How powerful is C++? Can C++ do everything other languages can do? Thanks!

[12 replies] Last: You need a text book for sure, but learning it yourself IS going to be... (by isthan)

by stormqueen1990

Dynamic allocation issue using ANSI C

Hi all, I'm trying to dynamically allocate a triple-dimension array, but I'm getting a runtime error exactly in the point I make the allocation, but I don't kn...

[3 replies] Last: Use of the %i format specifier is POSIX, not C. http://linux.die.net/... (by Duthomhas)

by robezy

Problem with using maps..

I'm solving one of the problems in UVa Online Judge. Problem statement below. A common typing error is to place your hands on the keyboard one row to the ...

[1 reply] : Use std::getline(). std::cin >> explicitly ignores whitespace. Another... (by helios)

by AR Khan

Data Record

Hi, Suggestions required... I want to build a program in which i enter some data and after some period i want to read same information by entering the date. Ho...

[3 replies] Last: Do you want to write the data a file? If so, have a look at std::fstr... (by kbw)

by happiness

cannot identify this error msg

#include<iostream> #include<string> using namespace std; class Person { public: string name,id; virtual string getRole()=0; string role; ...

[1 reply] : your Student constructor in line 43 is not defined. just add {} instea... (by hamsterman)

by cstroh

craps game

i have to create a craps game and i have looked at other code for it but mine doesn't need a betting system in it. this is what i have so far and it is sayi...

[2 replies] Last: Hi, this should work. #include <iostream> #include <ctime> #incl... (by bluezor)

by mhdbashir

How to calculate factorial of double variable (e.g. 3.2!)

How to calculate factorial of double variable (e.g. 3.2!)? I tried to write the following function but it gave me wrong answer! void factNumber(double nu...

[1 reply] : The formula n!=n*(n-1)*(n-2)*...*1 only applies when n is a natural nu... (by helios)

by Warrior2089

The this pointer

Does anyone know what the this pointer is used for in C++? I'm learning about it but I can't seem to find a true purpose to it. I'd imagine I would just call ...

[2 replies] Last: In many cases, though, it is necessary, especially when dealing with... (by Duthomhas)

by orangorangan

a strange occurance while using fstream

i just give a part of the program i have write: f.open(mhs.txt, ios::in | ios::out); int i=0; char c ; do{ f.seekg((MAX_LINE+1) * i++); f.read(c, strl...

[3 replies] Last: @screw thx for your advice! (by orangorangan)

by res

parsing a txt file

hi. im a beginner on c++.(This is not a schoolassignment im doing this for my own amusement.) I want to read a text file,and try to extract certain parts of it ...

[1 reply] : Use the Xerces XML library to handle your file. http://xerces.apach... (by Duthomhas)

by claud75

How to reduce fractions

So far im getting my fraction to equal a number. Code: if ((aFraction.numerator/aFraction.denominator) > 1) calculation9= aFraction.numerator/aFraction.d...

[3 replies] Last: I got it now! Thank you very much :) this is what i ended up with ... (by claud75)

by aladar04

Can't reverse the inputted characters

Sample Output: Type word(s): hello The reverse is 'olleh'. The problem is, I can't get it reversed. Please help... Here is my code... #include <stdio....

[3 replies] Last: thanks you very much screw!... (by aladar04)

by claud75

if/else statements

For a project we are doing in class it involves fractions and since im begging im a little confused on the if/else statements. What im basicly trying to make it...

[1 reply] : nvm i figured it out now, thank you anyway :). (by claud75)

by Triryche

Recursive Quick Sort (Brain Exploded!!)

I am studying a recursive quick sort algorithm by C.A.R. Hoare. (a classic I presume). The code appears to be working properly. I totally get the concept o...

[7 replies] Last: Sorry, I didn't understand you.. :) (by screw)

by a9642

Best way to draw a pixel

I've been programming in high level interpreted languages for a long time now, and am trying to get into C++. The problem I'm running into now is that I can't f...

[6 replies] Last: I don't think I've ever seen a drawing library that didn't let you set... (by jRaskell)

by aladar04

my simple calculator loops but it doesn't display the answer

hi! I'm just a beginner. Can you help me out with this simple calculator? Here's my code. Thanks in advance! I was thinking if there is a problem with my usa...

[2 replies] Last: thanks guestgulkan (by aladar04)

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Beginners - September 2009 (Page 4)