General C++ Programming - C++ Forum

how to find the no of digits after decimal point exactly

//c++ code int nocheck1(float e) { float q; int count1=0; q=e; while(q!=(int(q))) { count1++; q=q*10; } //cout<<count1; return count1; } this code will prov...

[6 replies] Last: I'll just leave this here: https://gist.github.com/Helios-vmg/abd9ef11... (by helios)

by GerardG

if statements on parts of a string

Hi, can someone help, I want to write "if statements" on parts of a string and I am not having any success. Here is some sample code to show you what i mean. T...

[3 replies] Last: Perfect, thanks FurryGuy. Sorry about the lack of code tags (by GerardG)

by TheBeardedQuack

Templates and lambdas, "incomplete type is not allowed" and

Right, it's been a while since I've done anything in C++ so if it's something really stupid gimme a break :) Also I've never really used lambdas either so same ...

[5 replies] Last: Okay I'll apologise for that as I moved the templates above and it's f... (by TheBeardedQuack)

by pacman169

Error

Getting this error here: warning: incompatible integer to pointer conversion passing 'int' to parameter of type 'char *' [-Wint-conversion] ...

[7 replies] Last: Your original code was recursive; this too is recursive (it uses your ... (by JLBorges)

by momalle

Taylor Series Lab

Having some trouble starting this in c++ language Consider the problem of approximating ln(1.9) with ten digits of accuracy, using either of the follow...

[1 reply] : 1. In series (A) use -0.9 . In series (B) use 0.9/2.9 . (by skaa)

by AcarX

How to read from a file with hex address

I need to read an entry from a packed file by it's hex address but i'm not sure how to approach this. Here's how an entry from reference file looks like: fi...

[4 replies] Last: Thanks for help. (by AcarX)

by nbt

Initialization via constructor

Hi! I am learning about classes right now and I am getting used to initializing data members like this: class Cat{ public: Cat(int age){itsAge = ...

[2 replies] Last: Perfect, got it. Many thanks. (by nbt)

by leourb

Sorting half of vector - Syntax

Hi everyone. I have read on my book that to sort an half of a vector I can write sort(v.begin(),v.begin()+v.size()) It is a bit unclear. v.begin() poi...

[2 replies] Last: I missed the parenthesis, sorry! Anyway in page 676 of C++ Programmi... (by leourb)

by technologist

q: abt static-cast function

Below code - simply experimenting with it to learn more abt static cast functions. THe purpose of the code was to show type conversion. What I don't understand ...

[6 replies] Last: > error redeclaration Don't redeclare; reuse the same variable. int... (by JLBorges)

by LASims

Type cast issue

unsigned long mSecDay = 0; double secondsOfYear = 0.0; mSecDay = 52575812; secondsOfYear = (double)(mSecDay) / 1000.0; in the debugger it shows answer a...

[5 replies] Last: Another alternative is to use rationals instead of floats. The only pr... (by helios)

by mahmoud2592

Reading from file input problem !!

i face a problem when i read input from a file, so what is the solution of this problem ? the input format is ---> 4 4 1 2 3 4 5 6 7 8 #include <iostream> #...

[5 replies] Last: thank you LB (by mahmoud2592)

by techishawn

closed (1,2)

closed

[30 replies] Last: thanks , may i check how do i print out the array after this as size i... (by techishawn)

by akash16

Virtual Pointer for Virtual table

Is virtual pointer inherits to derived class? I tried this and got the ans that 'yes'. Pleas check following example: class ClassABC { public: ClassABC...

[13 replies] Last: Right......... (by akash16)

by yj1214

How does native window api display graphics?

How does qui libraries like win32, cocoa and other libraries draw their graphics? (like buttons, background etc.) Do they use OpenGL?

[1 reply] : Search keywords: Graphics Device Interface (GDI), Quartz, DirectX. (by keskiverto)

by LB

MSVC chokes on template metaprograms

I'm getting an error in Visual Studio but not GCC or Clang. I have already tried my best to reduce the complexity of the code, but it is quite complicated becau...

[2 replies] Last: It's supposed to connect real C++ member functions to an ancient C lib... (by LB)

by mnm71

How convert vector 2D to char array??

I want to convert vector<vector<unsigned char> > v to char a and then convert char a to string ?? how can do this in c or c++??tank you...

[19 replies] Last: @JLBorges yeeeeeeeeeeeeeeeees tank you very very much it is work.... (by mnm71)

by newby13

whitespaces are killing me...

I've been working on this all night and for some reason I can't seem to get the output to come out right. here is my code: #include "stdafx.h" #include <iost...

[7 replies] Last: I can't believe I missed that all this time... missing one = :( <pick... (by newby13)

by hahacprog

Copy elements of pointer.

I tried to understand pointers and I cant figure out how to copy the elements of the array that the pointer point to. int main(){ char a = {'a', 'b...

[5 replies] Last: Hi, Array should be of size 4 at line number 4. For your que : "is th... (by akash16)

by hahacprog

Segmentation fault

Hi, I try to run this code and i got segmentation fault. #include <iostream> #include <string.h> #include <string.h> using namespace std; string sf(...

[2 replies] Last: so as you point out about the return. i modified my codes and it works... (by hahacprog)

by leourb

Operations between two classes

I have wrote two template classes: Vectors.h #include "std_lib_facilities.h" #include "Numbers.h" #ifndef Vector_Advanced_Vectors_h #define Vector_Advanced_V...

[6 replies] Last: Yep it was.. I have done! Thank you for your advices LB :) (by leourb)

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General C++ Programming - August 2015 (Page 4)