While or for loop?

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Mark Coughlin 2020-4-30

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编辑： Mehmed Saad 2020-4-30

Hi, I want to write a script which will evaluate the lowest factorial which is greater than the user's input, and I am unsure of whether to use a while or a for loop to execute this. Any help is always much appreciated! This is my code so far:

num=input('Enter a number: ');
n=0;
while (true)
    n=n+1;
    f(1i)=factorial(n);
    if f(1i)>num
        formatSpec='The factorial greater than %d is %d';
        fprintf(formatSpec,num,f);
    else
        continue
    end
end

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Guillaume 2020-4-30

Typically, you'd use a while loop if you don't know in advance how many times you're going to loop, and a for loop if you do. Therefore in your case, a while loop would be more appropriate.

However, note that you can always convert one to the other.

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采纳的回答

Mehmed Saad 2020-4-30

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Use while loop
instead of using if else and continue break in while(true), add condition in while loop
Print after the while loop ends

PS: you need a break condition for a while(true) type loop otherwise it will continue runing forever

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Mark Coughlin 2020-4-30

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Thankyou very much Mehmed, your explanation was extremely informative and helpful. I realise the solution is a lot simplier than I initally thought. I got the code working.

num=input('Enter a number: ');
n=1;
while (f<=num)
    n=n+1;
    f=factorial(n);
end
formatSpec='The factorial greater than %d is %d';
fprintf(formatSpec,num,f); 