Counting the number of decimal places in pascal -


i started studying pascal , have pascal program homework. made don't know how count number of decimal places in real number (the number of digit after ".").

i need format real number (like write(real:0:dec) dec number of decimal digit don't know how know). i'd because don't want in scientific notation or many unnecessary zeros.

for example if real number 1.51 (x) , write writeln(x:0:4); or writeln(format('%*.*f', [0, 4, x])); show 1.5100 want 1.51; , if number 1.513436, show 1.5134 . make writeln(x:0:dec); makes dec number of decimal digits of x.

the format() function used in situations this. 

writeln(format('%*.*f', [0, dec, your_real_number]));

*.* interpreted total_characters.decimal_digits. passing 0 first means width adjusted according how large real is. number of decimals can variable (dec), can adjust specification.

update:

you mention want exact representation of float respect number of decimals.

as mentioned in comment, floating point values not have finite number of decimals. , decimal fractions cannot represented binary type.

there libraries can handle floating point values of arbitrary size. see tbigfloat example. there formatting routine can strip redundant zeroes decimal float.

still, there possibility remove trailing zeroes using general format specifier:

writeln(format('%g',[your_real_number]));

you can specify width , number of significant digits well.


Comments

Post a Comment

Popular posts from this blog

jquery - How can I dynamically add a browser tab? -

since using iframes house external pages are, accounts "not preferred method" , disallowed sites (flickr, one), want dynamically generate browser tabs. e.g., when user submits form, want dynamically generate tab on browser in response submitted. e.g., might want add new tab url like: http://www.bigsurgarrapata.com/contact how in jquery? you want form target attribute action attribute. http://www.w3schools.com/tags/att_form_target.asp browsers have ultimate control on result of target attribute open new tab value of _blank. <form action="contact_submit.php" target="_blank" method="post">
Read more

node.js - Getting the socket id,user id pair of a logged in user(s) -

i have web application done using node js , in it,i have authentication system requires users log in before can access pages. have 2 pages,the homepage , updates page. from read docs,a new socket id issued when user opens tab in browser. me being admin,i know socket id of logged in user , more so,the socket id,logged in user id pair logged in users. what method can use socket id,logged in user id pair make sure broadcast realtime info users online?.
Read more

keyboard - C++ GetAsyncKeyState alternative -

i using windows.h library's getasynckeystate function define key pushed on keyboard . here program returns int value of pushed key example. #include <iostream> #include <windows.h> using namespace std; int main (){ char i; for(i=8;i<190;i++){ if(getasynckeystate(i)== -32767){ cout<<int (i)<<endl; } } return 0; } but trying make opengl simple game , function appeared slow . there function not need cycle 180 times , if statement . thanks you're trying make opengl game, you're going use glfw. if that's case can away using glfwgetkey() such: if (glfwgetkey(glfw_key_up) == glfw_press) {...} if (glfwgetkey(glfw_key_down) == glfw_press) {...} that method nicely explained in tutorial 6 opengl-tutorial.org . should start first tutorial of beginners tutorials , later intermediate tutorials . if you're going make win32 window can listen wm_keydown or wm_keyup messages , virtua
Read more