How to format fprintf with 2 decimals

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JGraf
JGraf 2017-2-24
评论： JGraf 2017-2-24
HI, I have looked at other examples of fprintf, but my formatting on fare(4,75) is off and I am not sure why? fare(4,44) output is correct. Fare (4,75) should be 2.20 (80% of the full fare for 4 miles at 0.80* 2.75) Maybe I have just been looking at this for too long to figure it out.
>> fare(4,44) 2.75 >> fare(4,74) 2.754.00 >>
function price = fare(d, a)
if d <= 1 price2 = 2;
else
price2 = fprintf('%.2f',2 + (min(9, d-1) * 0.25) + (max(0, d-10) * 0.10));
end
if 18 >= a || a >= 60
price2 = fprintf('%.2f',price2*0.80);
end
  2 个评论
Adam
Adam 2017-2-24
You haven't said what output you are looking for, you also didn't include the output for fare(4,75) in your question or what is wrong about it.
JGraf
JGraf 2017-2-24
Sorry,
The first one is correct. fare(4,44) = 2.75. The second one is wrong. Ideally it should 80% of the full price, so 2.20

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采纳的回答

Jan
Jan 2017-2-24
编辑：Jan 2017-2-24
If d > 1 you run this:
price2 = fprintf('%.2f',2 + (min(9, d-1) * 0.25) + (max(0, d-10) * 0.10))
fprintf writes the output to the command window and replies the number of written characters, which is 4: '2.75' .
Do not change the type of the variables during the code. Better perform all calculations with numbers at first and display it once at the end:
function price = fare(d, a)
if d <= 1
price2 = 2;
else
price2 = 2 + (min(9, d-1) * 0.25) + (max(0, d-10) * 0.10);
end
if 18 >= a || a >= 60
price2 = price2 * 0.80;
end
fprintf('%.2f', price2);
end

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