C++ factorial program give infinity for any number greater than 2 -

-

so it's 5:00 a.m. , confused , frustrated hell. i've created program before can't understand going on.

i've created simple factorial program , have double checked logic, every time enter number greater 2 program goes loop printing out "inf". can't see wrong program itself. :(

#include <iostream>  using namespace std;  int main() {     double usernumber = 0;     double = 1;      cout << "this program calculate factorial of number enter.\nplease enter number now: ";     cin >> usernumber;      ( = 1; < usernumber; i++ ) {         usernumber *= i;         cout << usernumber; }      cout << "\n\nthe factorial " << usernumber << "." << endl;      return 0; }

it works 1 , 2:

enter image description here

but 3 or greater....

enter image description here

i haven't created c++ program in while can't life of me see wrong. super obvious syntax error, or computer breaking down on me?

edit: changed numbers double int , got:

enter image description here

i still don't understand why doing this. don't see problem loop, or else...

argh. smashes head desk

change

for ( = 1; < usernumber; i++ ) {

to

for ( = usernumber - 1; > 1; --i ) {

note code changes usernumber in loop body, loop terminate if usernumber overflows.


Comments

Post a Comment

Popular posts from this blog

windows - Single EXE to Install Python Standalone Executable for Easy Distribution -

-
i used pyinstaller create standalone exe file pyqt project. did not use single file option because exe created single file option takes long open. therefore, pyinstaller created dist folder contains bunch of files including program.exe file. create setup.exe file place contents of dist folder in program directory , create shortcut in start menu , on desktop. want super simple user. maybe setup.exe files when download program cnet. found inno-setup, looks promising. however, not know if there special considerations because program standalone program create python/pyqt program. thanks! have experience task? there program using task not know about? inno-setup or nsis easiest use. tell them files include , put them , create nice installer you. wrote short tutorial on experiences using innosetup might find helpful: http://www.blog.pythonlibrary.org/2008/08/27/packaging-wxpymail-for-distribution/ note tutorial based around wxpython app wrote, concepts same.
Read more

c# - Access objects in UserControl from MainWindow in WPF -

-
i have simple xaml, how can change text property of textblock in usercontrol1 mainwindow ? <window x:class="refactorxaml.mainwindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:refactorxaml="clr-namespace:refactorxaml" title="mainwindow" height="350" width="525"> <grid> <grid.rowdefinitions> <rowdefinition height="100"></rowdefinition> <rowdefinition height="100"></rowdefinition> </grid.rowdefinitions> <grid> <refactorxaml:usercontrol1></refactorxaml:usercontrol1> </grid> <grid grid.row="1"> <button>change text</button> </grid> </grid> </window> <usercon...
Read more

javascript - How to name a jQuery function to make a browser's back button work? -

-
i'm trying write function ajaxyfy web site, works perfect, except function button. that's have now: function loading() { if (typeof history.pushstate !== "undefined") { var historycount = 0; $('.menu-item, .logo').on('click','a',function(e){ e.preventdefault(); $(this).data('clicked', true); if ($(this).is('.logo a')) { var homepage = $(this).attr('href'); function1(homepage); history.pushstate(null, null, homepage); } else if ($(this).is('.projects a')) { var projects = $(this).attr('href'); function2(projects); history.pushstate(null, null, projects); } else { var pages = $(this).attr('href'); function3(pages); history.pushstate(null, null, pages); ...
Read more