Simple program but wrong output

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Dave Mosooka
Dave Mosooka 2016-12-15
回答： Walter Roberson 2016-12-15
My program gets three unique points (positive integers) and should rearrange them so they are in order from point 1 to 3 but when I print the variables at the end they are sometimes not in order. My code is pretty straight forward and I think it's obvious what I am trying to do but I must be doing something wrong here?
%get unique points
point1 = randomPoint();
point2 = point1;
point3 = point1;
while point1 == point2
point2 = randomPoint();
end
while point1 == point3 || point2 == point3
point3 = randomPoint();
end
%check ordering
if point1 > point2
temp = point1;
point1 = point2;
point2 = temp;
end
if point2 > point3
temp = point2;
point2 = point3;
point3 = temp;
end
display(point1);
display(point2);
display(point3);
-
function [point] = randomPoint()
%get random points
point = 0; %1, 4, 7, 10, 13, 16, 19, 22, 25, 28
while mod(point, 3) ~= 1 %fall on start of fsm state
point = randi([1,28]);
end
end
Example output: >> run main
point1 =
13
point2 =
10
point3 =
19

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采纳的回答

Walter Roberson
Walter Roberson 2016-12-15
After you swap point 3 down to point 2, you need to figure out whether it then needs to be swapped down to point 1. Consider for example, [6 5 4] then your first operation would swap to [5 6 4] and your second operation would swap that to [5 4 6] but you need to compare that 5 and 4.

更多回答（1 个）

David Barry
David Barry 2016-12-15
Instead of:
%check ordering
if point1 > point2
temp = point1;
point1 = point2;
point2 = temp;
end
if point2 > point3
temp = point2;
point2 = point3;
point3 = temp;
end
Try something like:
sortedPoints = sort([point1, point2, point3]);
point1 = sortedPoints(1);
point2 = sortedPoints(2);
point3 = sortedPoints(3);

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