[c++] Forum Topics

#include<iostream> using namespace std; class Singleton { static Singleton * s; Singleton() { } public: ~Singleton() { s = NULL; } static Singleton * getInstance(); void print() { cout<<this<<endl; } }; Singleton* Singleton::s=NULL; Singleton* Singleton::getInstance() { if(s == NULL) { s = new Singleton(); } return s; } int main() …

I am trying to write a program that takes unlimited input of names using dynamic memory and stop when the first character is the enter key. i tried, but i am unable to do it. #include "ReadString" void main() { const int NumNames(20); char **pNames; pNames=new char [NumNames++]; for (i=more;i<NumNames;i++) …

Good day. I was surprised to see that there are no members on objects declared as IFSTREAM and OFSTREAM. I have this code; ifstream indata; ofstream outdata; indata.open(""); outdata.open(""); It can't seem to recognize the member "open". Why is that? Any solution?

Hey, guys. Find the sum of all the primes below 2000000. My code: *main.cpp* #include <iostream> #include <vector> #include <cmath> #include "Sieve.h" using namespace std; typedef unsigned long long int ulli; ulli Sum = 0; ulli Sum_of_Primes(vector<bool>, ulli&); ulli Sum_of_Primes(vector<bool> Primes, ulli& Sum) { for(ulli a = 2; a < …

How can I declare a name in a c++ program?

from MSDN: https://msdn.microsoft.com/en-us/library/windows/desktop/dd145213%28v=vs.85%29.aspx "An application returns zero if it processes this message." see these code on my label control: case WM_PAINT: { PAINTSTRUCT test; BeginPaint(inst->hwnd, &test); image imglabel(inst->imgtest.width(),inst->imgtest.height()); brush brshbackcolor(inst->clrBackColor); imglabel.Backcolor=inst->clrBackColor; brush brshTransparent; FillRect(imglabel,&test.rcPaint,brshbackcolor); if(inst->imgtest.haveimage()) DrawHICONtoHDC(imglabel, inst->imgtest); imglabel.DrawText(inst->strCaption); pen penColor(1,2,RGB(0,255,0)); penColor.ToDC(imglabel); imglabel.DrawRectangle(10,10,10,10); pen penColor2(1,2,RGB(255,0,0)); penColor2.ToDC(imglabel); imglabel.DrawLine(0,0,20,20); pen penColor3(1,2,RGB(0,0,255)); penColor3.ToDC(imglabel); //brshTransparent.ToDC(imglabel); …

Hi guys, I just found out that setw is not recognized in Netbeans C++ with Cygwin even when IOMANIP is included in my program. Is there anything I can do for this? I need to format the output of my program, thanks.

My code is working almost the way I need it to. However, when I run the program I am getting this Welcome to Johnny's Restaurant Bacon and Egg $2.45 Muffin $1.98 Coffee $0.50 Tax $0.25 Amount Due $5.18 When I want to get this: Welcome to Johnny's Restaurant 1 Bacon …

# Im a beginer in programing language, i just started programing using turbo c++ , however every time i download a c++ software from net it turns out to viral and it doesnt work properly. please kindly send me a link from which i can install turbo c++ as soon …

Hi, I managed to change a cursor in C++ windows console size using the function HANDLE output = GetStdHandle(STD_OUTPUT_HANDLE); CONSOLE_CURSOR_INFO cz; cz.dwSize =100; cz.bVisible =TRUE; SetConsoleCursorInfo(output, &cz); But I'm having a hard time to make the cursor not to blink. I couldn't find any function in MSDN to do that. …

Hey, guys. A Pythagorean triplet is a set of three natural numbers, a < b < c, for which, a² + b² = c². For example, 3² + 4² = 9 + 16 = 25 = 5². There exists exactly one Pythagorean triplet for which a + b + c …

HI everyone, I need help in c++. Problem : I want to write a program that calculate x digits of pi. Like if my input is 3 output should like this 3,14 or this 3,145 if my input is 10 output should like this 3,14529xxx or lik this 3,14529xxxx. I …

Hi all, This is something very basic i know. I just wanted to avoid some confusion. What is the difference between char *names[100]; and char names[100]; This is what i know char names[100]; - its just a character array which can hold 99 characters and the last one will be …

If i have an array of names char *names[100]; (stored as pointers to strings), how to find the name that appears the most times in the array and how many times it appears. (a) if only one “mode” (b) multiple “modes” I'm thinking of implementing something similar to selection sort …

Hello, guys. How would I deal with a variable that needs to be biggers than an unsigned long long integer? Thank you.

Hello, guys. This challenge asks us to find the 10001-th prime. Here's my code: // A reasonable approximation is to say that the n-th prime is such that p(n) = n*(log n + log*(log n) - 1). // With that in mind, we can say that the 10001-th prime is …

HELLO everyone i have a problem with which link is here can anyone help me please http://acm.epoka.edu.al:8080/en/problem-pid-c50f?ps=1&smt=a&smpwid=0

This is what I have so far #include <iostream> #include <iomanip> using namespace std; const int NUM_SECTIONS = 3, NUM_ROWS = 5, NUM_COL = 9; int main() { int seatTable[NUM_SECTIONS][NUM_ROWS][NUM_COL] = { { { 100, 100, 100, 100, 100, 100, 100, 100, }, {100, 100, 100, 100, 100, 100, 100, …

I've just started learning C++ on Linux. I have written a very small program which compiles but I get run time errors everytime I run it. The code is shown below: #include<iostream> int DoubleOf(int n); int main() { std::cout << "Double of 5 is " << DoubleOf(5); return 0; } …

how do you write a c++program using the do while and while do loop to list prime numbers between one and thirty

Hi guys I am really having trouble on what to do with my program. We are asked to make a cashier's program and I don't know how to do the the Receipt... I don't know what to do in the order part... how about if the customer will order 3 …

Write a program to check the password is too strong or strong or weak & also check the password is validate or not.. you can use code of c/c++ and you want ....

Write a program that accepts three values from a user and print the two highest value and thier sum.

OK, so I've asked a question like this before and I thought I understood the answer (solved) but I am having problems again and I still do not understand why. I am compiling with MinGW. Here's the code: string filename="D:/__GNU analyze/test/bin/Debug/_ClusterFormat/Test2.6d .txt"; fstream file, file2; string cluster="frame"; string line; Matrix …

I have this in a code: ` int load_snapshot(char *fname, int files) { FILE *fd; char buf[200]; int i, j, k, dummy, ntot_withmasses; int t, n, off, pc, pc_new, pc_sph; #define SKIP fread(&dummy, sizeof(dummy), 1, fd); for(i = 0, pc = 1; i < files; i++, pc = pc_new) { …

plz some one explain in details this code : we have array of 9 cells and 0 present empty locations we want solution of this array (no number will be repeated) also if there is any way to call this functions in main so as the program runs succesfully plz …

Hey guys im having a problem in structures.. i dont know how to initialize a an array of 10 contact instances.. plz help me out. this is my question statement.. "Declare a structure Contact that has a name, address, mobile number. Now create and (hardcoded) initialize an array of 10 …

hi i have a unknown string in c++ containing "\n" "\t" etc. say; string unknown1="\n\t\n\t\n\n\n\n\n"; now I want to print "\n\t\n\t\n\n\n\n\n" to the screen explcitly other than a bunch of empty spaces.... how should I do that? remember that I don't know what is in unknown1...

I have downloaded the program from here http://www.tightvnc.com version 2.7.10 and compiled successfully using visual studio 2013. One is the tvn server and other is the viewer. We connected successfully the server and viewer using my friend’s laptop pair with server and client interaction. When the application runs all the …