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

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patty
patty 2015-4-29
评论： Walter Roberson 2025-2-6
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
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patty
patty 2015-4-29
编辑：James Tursa 2015-4-29
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

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James Tursa
James Tursa 2015-4-29
编辑：James Tursa 2015-4-29
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.

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Siyanda
Siyanda 2025-2-6
编辑：Walter Roberson 2025-2-6
n = input('Enter a number:');
for sentence = 1:n
n = fprintf('%d. Hello world!', n);
disp(n:1)
end
//Is correct
  2 个评论
Walter Roberson
Walter Roberson 2025-2-6
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
Walter Roberson 2025-2-6
Ran in:
%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()

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