matlab loops break and continue commands

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Alinetin
Alinetin on 9 Apr 2020
Commented: Walter Roberson on 9 Apr 2020
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.
  2 Comments
mehmet kiraccakali
mehmet kiraccakali on 9 Apr 2020
Edited: mehmet kiraccakali on 9 Apr 2020
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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Answers (1)

Peng Li
Peng Li on 9 Apr 2020
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
  7 Comments
Walter Roberson
Walter Roberson on 9 Apr 2020
sum of its largest three positive divisors
That is why 3 was chosen to compare against.
ind is being used to count how many factors have been found so far.

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