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I wrote a code for determining the volume need for each stage of a rocket

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clear;clc
%create the statement
radius1=16.5;height1=138.0;radius2=16.5;height2=81.5;radius=30.8;height3=61.6;
height=input('Enter a value for height');
volume=(height)
if height<=138
volume=(pi*height*radius1^2)
disp(volume)
elseif height<=219.5
volume=(pi*height1*radius1^2+pi*(138-height)*radius2^2)
disp(volume)
elseif height<=281.1
volume=(pi*height1*radius1^2+pi*(138-height)*radius2^2+pi*(219.5-height)*radius3^2)
disp(volume)
else height>281.1
disp(-1)
end
I run it through the checker and the code is still wrong when I run it through the grader. What might I be doing wrong in writing my code. I gave the height and radius in each stage above and I am using the volume formula for a cylinder.

Answers (1)

Youssef  Khmou
Youssef Khmou on 28 Jul 2013
Steven, The error i can see is that the volume is negative, because you substract the height from 138 & 219.5 while its the reverse, try this version :
clear;
radius1=16.5; height1=138.0;
radius2=16.5; height2=81.5;
radius3=30.8; height3=61.6;
height=input('Enter a value for height:\n');
if height<=138
volume=(pi*height*radius1^2);
elseif (height>138) && (height<=219.5)
volume=(pi*height1*radius1^2+pi*(height-138.00)*radius2^2);
elseif (height>219.5)&&(height<=281.1)
volume=(pi*height1*radius1^2) + (pi*(height-138.00)*radius2^2) + ...
(pi*(height-219.5)*radius3^2);
elseif height>281.1
error(' Maximum height exceeded hmax=281.1');
end
fprintf(' Volume=%.2f m^3\n',volume);
  1 Comment
dpb
dpb on 28 Jul 2013
I'd preferred the hint version for HW problems instead of just doing it for the poster...but that's me.

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