Help in n factorial!!!

Hello,

Please help me in this question :

"Write a program that reads a nonnegative integer and computes and prints its factorial."

I don't understand the question and even internet doesn't help me either.

Please anyone help me before 11/4/2011.

Answer 1

[rana ali]

n=input('the value of n: ');
f=1;
for i=1:n
f=f*i;
end
disp('factorial is')
disp(f)

[John D'Errico]

I deleted your virtual duplicate (OTHER) answer. In the future, if you want to modify an answer, then edit it.

[Walter Roberson]

For 23, this code produces 25852016738884978212864 instead of the correct 25852016738884976640000

Answer 2

[Matt Fig]

What do you mean you don't understand the question? I find this very difficult to believe. You know what it is to write a program, right? You know what it is to compute something, then print it? Even if you don't know what a factorial is, the internet surely could help. Here:

FACTORIAL

Please think it through, do some research, then clarify what you don't understand. Folks here are glad to help when the asker (especially a homework doing asker) puts out some effort and keeps the topic to specific MATLAB questions.

[Dungun_Ganu]

Right,

I found it in internet and programmed it like this :

n=5;
factorial=1;
for i=1:1:n
 factorial=factorial*i;
end

After that, I run it and computed ">> factorial",

The output gave ;

factorial =

120

Just like it's theory, 5!=120.

Is it correct the way I programmed it?

By the way, sorry for my poor grammar since I'm not English's native speaker.

[Matt Fig]

Your code looks good, and Walter points out the infeasibility of fulfilling the requirements as written (or at least as relayed).

I would also point out that naming your M-file FACTORIAL will mask the built-in MATLAB function by the same name.

Answer 3

[Walter Roberson]

Although your proposed code looks good, you will find that it does not produce correct answers for n=18 or above. Your program is required to handle all non-negative integers, not just 1 to 17. You might perhaps be able to negotiate that your program does not have to handle any integers greater than about 10^308.

You are, though, going to run in to considerable difficulties long before that -- for example, (2^27)! is approximately 8.35*10^1032606161 and there aren't enough elementary particles in the Universe to be able to write that number out exactly.

Answer 4

[Mohammed Ali]

Write a program to calculate the factorial N!: a. N!=1, N=0 b. N!=N*(N‐1)*(N‐2)...*3*2*1, N>0

n=input('enter n:')
fact=1
if(n==0)
    fact=1
    for i=n:1:-1
        fact=fact*i
    end
end

[Image Analyst]

Nope, that won't do it. Did you actually try it?

It's even wrong in more ways than one.

Answer 5

[duoduo chen]

n=input('Enter the value of n:');
factorial=1;
if n<0
    fprintf('Error!\n');
elseif n==0
    factorial=1;
    fprintf('factorial=%d\n',factorial);
else 
    for ii=1:n
        factorial=factorial*ii;
    end
    disp(['factorial=' int2str(factorial)]);
end

[Walter Roberson]

What does your code have to say about 23 factorial?

[Stephen23]

Note that the elseif n==0 section is entirely superfluous.

You can start the loop iterations from 2 rather than 1.

As mentioned by Loginatorist eight years ago, the name factorial should be avoided.

[YILMAZ TUNAHAN YILMAZ]

dayı adamsın 3 saattir bununla uğraşıyoruz kralsın bitanesin

Answer 6

[Lawrence Liu]

function val=factorial(n) 
if (n==0)
    val=1; 
else 
    val=n*factorial(n-1);
end
end

[Walter Roberson]

This will fail when n exceeds 50, giving an error about recursion limit.

It will, as indicated in other responses, start producing incorrect answers long before that.

It will run indefinitely when asked to process a negative input.