matlab loops break and continue commands

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Alinetin 2020-4-9

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https://ww2.mathworks.cn/matlabcentral/answers/516646-matlab-loops-break-and-continue-commands

评论： Walter Roberson 2020-4-9

In number theory, a semi-perfect number is a positive integer number that is equal to the sum of its largest three positive divisors, excluding the number itself. For example; 18 is a semiperfect number, the positive divisors of this number are 1,2,3,6,9,18, and the sum of the three largest integer divisors (excluding the number itself) is 3 + 6 + 9 = 18. Write a MATLAB program that checks whether a given number is semi-perfect number.

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Ameer Hamza 2020-4-9

This seems like a homework question. What have you already tried?

mehmet kiraccakali 2020-4-9

编辑：mehmet kiraccakali 2020-4-9

在 MATLAB Online 中打开

n=input('Enter a number ');
sum=0;
for i=n-1:-1:1
    if mod(n,i)==0
  sum=sum+i;
    end
end
  if sum==n
      fprintf('%d is a semi-perfect number \n',n);
  else
      fprintf('%d is not a semi-perfect number \n',n);
  end

I couldn't solve this question either, I tried to make the solution above. but i don't know how to find the three biggest divisors.

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回答（1 个）

Peng Li 2020-4-9

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https://ww2.mathworks.cn/matlabcentral/answers/516646-matlab-loops-break-and-continue-commands#answer_425071

在 MATLAB Online 中打开

You are almost there. Just need a seperate counter that force the loop to break if it accumulates to 3.

n   = input('Enter a number ');
sum = 0;
ind = 0;
for i = n-1:-1:1
    if mod(n, i) == 0
        sum = sum + i;
        ind = ind + 1;
        
        if ind == 3
            break;
        end
    end
end
if sum == n
    fprintf('%d is a semi-perfect number \n',n);
else
    fprintf('%d is not a semi-perfect number \n',n);
end