C++ :: Fastest Way To Calculate Fibonacci
Apr 1, 2013What is the most efficient way to calculate Fibonacci. Is it recursion with memorization, is it iteration or is there another approach?
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C++ :: Calculate The Nth Number In Fibonacci Sequence
Feb 28, 2013I was trying to create a code to calculate the nth number in a Fibonacci sequence, when the nth number is entered interactively.
View 4 Replies View RelatedC/C++ :: Fastest / Most Efficient Way To Add Two Fractions
Jul 12, 2012I have to write a function
struct rNumber add(rNumber a ,rNumber b);
which adds two rational numbers in following representation :
rNumber := s*(n/d)* 2^e
struct rNumber{
_byte_t s; // sign (do not consider for this question)
uint n; //numerator
uint d;// denominator
short e;//exponent
}
If the exponents of both numbers are not equal, then they have to be made equal in order to add them. This can be made in 4 ways : increase or decrease the n or d of both numbers.
But if we decrease the denominator of a number (a.d =1) by shifting it for example 1 bit to the right, we get 0 which leads to INFINITY for the fraction. In another case decreasing the numerator would lead the n to be 0 which meanse the whole fraction is then 0.
According to this, in worst case, all 4 cases has to be checked for the right result.
So far the UNDERFLOW of n or d is considered. If we try to increase the value of n or d, then OVERFLOW may also occur.
The very first, intuitive solution would be iteratively increase/decrease one of the terms and to check if the change leads to ZERO or INFINITY.
C++ :: Fastest Way Of Passing Data To A Class
Apr 25, 2013I'm currently building a new data structures that will be used in monte carlo generators (and so will be constructed several million times) and I'm wondering what's the best way (computer-speed-wise) to pass the data to the constructor. I am currently doing it using references and passing arrays as pointers like this:
Code:
class particle{
public:
particle(double *ar,int &id):IDup(id){
for (int i=0;i<5;++i)
Pup[i]=ar[i];
}
int IDup;
double Pup[5];
};
I'm assuming that since using references has no need to create a temporary memory slot it's more efficient .....
As for the arrays: is there a way for me to pass them as reference as well? (not using c++11), I'm using arrays instead of vectors as much as I can because I assume that vectors, being more advanced data structures, would take more time to create.
C :: Fastest Way To Check If Bytes Contained In Array Are All X00
Nov 30, 2014I'll process the raw content of a stream which obviously will be loaded one chunk at a time into an buffer.I need to check if every chunk content is x00 filled. If it is, I'll increase the blank chunks counter of 1.On your personal opinion, which is the fastest an less cycles consuming manner to achieve such result?
I was wondering this: is it possible to make an instant XOR of all the buffer content to check if it does return 0 ?the only way is it to cycle through all the bytes and compare each one of them with 0?
C++ :: Absolute Fastest Container To Lookup Names
Jan 9, 2013Names are std::string no more than 3 characters in length. What built in container or boost container is fastest at finding a name (Key) in it's container.
Finding a name.
At the name will be a value double.
I need the most efficient at finding and finding/updating the value. Forget out inserts and deletes.
C :: Fastest Way Of Changing Elements In Array Of Characters For Encode
Feb 15, 2014I am wonder what is the fastest way of changing elements in array of characters for encode purpose, here is simple example presenting an idea:
Code:
char *a = "123456789":
char b[] = "ABCDEFGHI";
int 1;
for (i=0;i<strlen(a);i++) {
b[i] = a[i];
}
Is this approach better or worse than bit manipulation ?
C++ :: Fastest Comparison Algorithm Based On A Predefined Container?
Sep 3, 2014Suppose you have defined a container of elements and you want do define a comparison function between elements based on the ordering of the elements in that container. What algorithm for the comparison would be the most efficient?
Example:
master = {tom, sam, mary, sally, bert, frank}
subset = {bert, sam, mary, tom}
goal: change subset to {tom, sam, mary, bert}
My current idea is to simply iterate from the beginning of the container, and whichever of the two elements is found first is the lesser (assuming the second is not the same as the first). It seems kind of naïve though. Any better performing algorithm? This is what I have so far:
#include <iostream>
#include <iterator>
#include <list>
#include <vector>
#include <stdexcept>
#include <algorithm>
[code]....
Would perhaps forcing the container to have a random access iterator, like vector, and then writing a specialized comparison function based on that perform even faster? Or perhaps force the container to be a map to integers, and compare the elements by comparing the integer mapped values?
C :: FIbonacci Sequence With Formatting
Sep 2, 2014I made a fibonacci series with label above it now how to put the label after the first layer because as you can see in the screenshot the label is continuous.
View 2 Replies View RelatedC/C++ :: Pi Approximation With Fibonacci Series?
Oct 11, 2014I can't seem to get the math portion right. It is supposed to approximate pi using (sigma,i=-1 to infinity)(-1)^(i+1)(4/(2i-1))=4(terms of pi). And what I have does some math but it is incorrect because I get a negative value for pi and one that is entirely too large at that. The precision is also to be at 20 decimal places. I also need it to end immediately after if I get an invalid input, but I can't seem to get it to end after trying a few different things it will say that it is an invalid number, but will continue to run the math loop. I also need the final cout to print all the terms that is multiplied by 4.
[code]#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
int main() {
int nterm, numerator;
double sum = 0.0;
const int upperBound = nterm * 2;
cout<<"This program approximates pi using an n-term series expansion. "<<endl;
[code]....
C/C++ :: How To Do Fibonacci Sequence Program
May 5, 2014Q) How to do nested loops?
Q) How to do Array?
Q) How to do Fibonacci sequence?
C++ :: Sequence Of Fibonacci Number
Feb 16, 2014The next code is right. I mean it works. It gives the sequence of fibonaci numbers ...
Code:
#include <iostream>
#include <iomanip>
using namespace std;
int fibo(int pos) {
if(!pos)return 0;
if(pos==1)return 1;
[Code] .....
But.... when I change the lines:
Code:
int r1=fibo(pos1);
int r2=fibo(pos2);
int r=r1+r2;
For the lines:
Code:
int r=fibo(pos1)+fibo(pos2);
It doesn't work right. Apparently it should work the same.
C :: Change Prototype For Generate Fibonacci
Apr 12, 2014I have written this bit of code for the Fibonacci sequence.
Code:
9 int size=0;
10 int fib[DWORD];
11
}
[code].....
I have tried quite few things and I am trying to change the prototype for generate Fibonacci to... int* generateFibonacci(size). I have been trying to use calloc inside generateFibonacci and then declare a pointer in main that points at the address of the pointer that generateFibonacci returns.
C++ :: Program To Display First 40 Fibonacci Numbers
Feb 25, 2014Write a program that displays the first 40 Fibonacci numbers. A Fibonacci number is created by add the previous two, with the first two always being 0 and 1. A partial sequence is as follows:
0, 1, 1, 2, 3, 5, 8, 13, 21,….
Your table must display 6 numbers per row and use a spacing of 10 for each number. Don’t forget to include the header file “iomanip” at the top and use “setw()”. You will need to turn in an algorithm, source code and output.
Here is what i have but i get errors!
#include <iostream>
using namespace std; {
int FirstNumber = 0;
int SecondNumber = 1;
int NumberOfNumbers = 2;
int NewNumber;
[Code] .....
C/C++ :: Fibonacci Number Sequence Implementation?
Jun 19, 2013I need to implement the fibonacci number sequence. Here is an example output of the program:
Server:Waiting for connection
Server:Receive connection from client
Client:10
Server:Print 10 Fibonacci
Server:1 1 2 3 5 8 13 21 34 54
Client:1 1 2 3 5 8 13 21 34 54
if Client send value of 5, the output would be 1 1 2 3 5
C++ :: Create Fibonacci Sequence With Some User Inputs
Aug 26, 2013I'm trying to make a fibonacci sequence with some user inputs. I'm using arrays for this, the user inputs are for the Nth term and the starting number (as in the number in front of 0).
My problem is that when the program runs it's an infinite loop which constantly prints the starting number. Which, I think, means that my WHILE loop isn't coming to an end and my 'count' variable isn't increasing.
#include <iostream>
using namespace std;
int main() {
int start;
int term;
cout << "Input a starting number for the sequence: ";
cin >> start;
cout << "
Enter the Nth term for the sequence to reach: ";
[code].....
C++ :: Store 100th Fibonacci Number Into A Variable?
Feb 24, 2013Is it even possible to store the 100th Fibonacci number (beginning with the numbers 1 and 1) into a variable? I know the number is pretty huge, and wondered if there is a data type to hold a number that big.
View 6 Replies View RelatedC/C++ :: Reverse Fibonacci Sequence - N Number In Series
Sep 3, 2014When ever I enter a value higher than 10, my out put looks like this
How many numbers are in the Fibonacci Series? 20
0 0 0 0 0 0
0 0 0 0 34 21
13 8 5 3 2 1
1 0
Press any key to continue . . .
This is what I got when I entered the value 20.
As you can see, it will only display up to the 10 term of the Fibonacci sequence
I'm trying to get the output to look like this:
4181 2584 1597 987 610 377
233 144 89 55 34 21
13 8 5 3 2 1
1 0
Here is my code:
#include <iostream>
#include <iomanip>
using namespace std;
#define SIZE 20
void Fibonacci( int );
int main( ) {
cout << "How many numbers are in the Fibonacci Series? ";
[code].....
C# :: Fibonacci Series - Adding Value In Array Inside While Loop
May 27, 2014I am making a program to run Fibonacci series. I have created 2 array.
1)- 1st array holds only 0, 1
2)- 2nd array holds other values eg: 1, 2, 3, 5..........etc
I am using while loop to get the febonacci series and storing it in a 2nd array called int[] numbers.
After getting value using while loop, I am joing both the arrays using int[] final = arr.Concat(number).ToArray();
At last, I have used foreach loop to add the febonacci series into the listbox.
The problem I have is that, I cannot able to concat both the arrays. I tried to assign number array at the top of the while loop. so that number variable will be accessible outside the while loop. But I am getting a error.
See the code below
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
[Code] .....
C/C++ :: Write A Function Fibonacci That Takes Int Indicating Length
Sep 2, 2014We have to write a function named fibonacci that takes an int indicating the length of the series and then store it in an array of size 20 printing the sequence from largest to smallest. Here is the small bit i have so far:
#include <iostream>
#include <iomanip>
using namespace std;
void Fibonacci( int );
int main( ) {
[Code] ....
I just need something to get me on the right track.
C++ :: User Input Number And Then Computer Calculates It For Fibonacci Series
Mar 15, 2013I was asked to write a code that has the user input a number and then the computer calculates it for the Fibonacci series. The output should be separated by commas and a period should follow the last number. Ex. 1,2,3,4,5. <---period
I can't seem to get the period at the end. I have the commas and everything else. Here is my code:
#include "stdafx.h"
#include <iostream>
using namespace std;
int main() {
double num;
cout << "How many Fibonacci numbers do you want to display?";
[Code] ....
C++ :: Program To Display All Fibonacci Numbers And 21st Digit Using Array
Mar 7, 2013Create a program that display all the fibonacci numbers and display the 21st digit using array.
Here's my code:
#include <iostream>
using namespace std;
int main () {
cout<<" This program shows a series of fibonacci numbers
"<<endl;
[Code] ....
C :: Calculate Approximate Value Of E
Jul 12, 2013I'm trying to write a program to calculate an approximate value of e using the formula e = 1 + 1/1! + 1/2! + ....... 1/n!...However, I'm always getting nearly 2.291481 as answer.Here is my code :
Code:
//Approximate the value of e
#include <stdio.h>
int main(void) {
int n, j;
printf("Please enter value of n : ");
scanf("%d", &n);
[code]....
I know I'm not supposed to use system("PAUSE"), but this is self-study.
C++ :: Program To Calculate BMI
Oct 7, 2013I'm trying to successfully run a program that calculates your BMI but, although it runs, it is not giving the the correct math. Instead, it gives me the number i've submitted as my weight as an answer. I'm using Visual Studio 2008 and the formula: weight / (height/100)*2
Here is my code
#include <iostream>
#include <cmath>
using namespace std;
int main() {
int weight;
int height;
double BMI;
[Code] ....
C++ :: Calculate Something More Than A Var Can Handle?
Jan 1, 2013Let's say I want to calculate something like PI using some algorithm, but with the number of digits I want to.
View 1 Replies View RelatedC/C++ :: Calculate Sum Of Every Digit
Nov 22, 2014I want calculate sum of every digit in my zip code so I wrote implementation function like that but, it shows "0" as answers, then I realize it should be call first, I add correctionDigitOf() in to constructor "Zipcode::Zipcode" then My zipcode are all "0' after I do this .....
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <ctime>
#include <cmath>
using namespace std;
class Zipcode {
[Code] ....