How do I print a sentence "Hello world!" n number of times?

n is the value you would enter to display it that number of times, for example:

n = 3

the answer would be

1) Hello world!
2) Hello world!
3) Hello world!

Thanks

[James Tursa]

Please post what you have done so far and we can comment on it and make suggestions.

[Star Strider]

You already mentioned the functions you need in your tags.

[patty]

I tried this

n = input('Enter a number:');
for sentence = n:1
   n = fprintf('%d. Hello world!', n);
    disp(n:1)
end

I'm new to matlab so I was hoping someone could help me figure it out. thanks

Answer 1

[James Tursa]

Since you posted your code I will make some corrections for you:

n = input('Enter a number:');
for sentence = 1:n  % have the indexing go from 1 to n, not reverse
    fprintf('%d. Hello world!\n', sentence); % print the index, and a newline \n
end

The fprintf will print out your line. You don't need the extra disp.

Answer 2

[Siyanda]

n = input('Enter a number:');
for sentence = 1:n
    n = fprintf('%d. Hello world!', n);
    disp(n:1)
end

//Is correct

[Walter Roberson]

The result of fprintf() is the number of bytes written by fprintf(). As long as n is a numeric value, that number of bytes will be greater than 1.

disp(n:1) then asks to display a vector of numbers starting from n and counting upwards by 1 with final value no greater than 1. As we have shown, n will almost certainly be greater than 1, so that vector will start from a number greater than 1 and will end at 1 -- so it will generate the empty vector. As a result, the disp(n:1) will display the empty vector.

Now, you have

n = fprintf('%d. Hello world!', n);

which is replacing n with the number of bytes printed by fprintf(). The next iteration, n will have been replaced and so it will display the updated value of n ... and then will replace n with the updated number of bytes printed. There will probably be a couple of iterations before it gets to a steady state and the number of bytes printed matches the existing value of n.

[Walter Roberson]

%n = input('Enter a number:');
n = 5;
for sentence = 1:n
    n = fprintf('%d. Hello world!', n);
    disp(n:1)
end

5. Hello world!15. Hello world!16. Hello world!16. Hello world!16. Hello world!

Everything appears on one line because no \n format specification was given in the fprintf()