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How do I find the last number that added up to or over 10000?

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Collin Kerr
Collin Kerr 2016-3-31
评论： Star Strider 2016-3-31
x = 1;
while x<10000
x = x + 2;
end
disp(x)

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回答（1 个）

Star Strider
Star Strider 2016-3-31
Well, you’re summing ‘x’ so you’re also using it as a counter.
The obvious answer is ...
x
  2 个评论
Collin Kerr
Collin Kerr 2016-3-31
编辑：Collin Kerr 2016-3-31
Using this code it tells me x is 10001, what im trying to figure out is, how do I tell matlab to pinpoint what the last number was that added up to 10001. Or if I wanted to ask it what was the number that added up x to 501. It starts of 1 + 3 + 5 + 7, which adds up to 16 so 7 was the number that added to 16.
Star Strider
Star Strider 2016-3-31
For that, you need to add a counter that increments after the addition:
x = 1;
k = 0;
while x<10000
x = x + 2;
k = k + 1;
end
Here, ‘k’ is the number of iterations.
To find the last value of ‘x’, you need to add a summing variable (here ‘s’) and test for it:
x = 1;
s = 0;
k = 0;
while s<10000
x = x + 2;
s = s + x;
k = k + 1;
end
So now, ‘s’ is the sum, ‘x’ is the last number added, and ‘k’ is the number if iterations.

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