# it won't run as it keeps showing illegal use of the word else

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Eti Rastogi on 14 Sep 2020
Answered: Ayush Gupta on 17 Sep 2020
tank_diameter = 4.1; % Diameter of the tank [meters]
total_tank_length = 20.5; % total length of the tank [meters]
fluid_height_increment = 0.25; % increments for fluid height [meters]
safety_percent = 0.8; % safety percent [decimal]
%% ____________________
%% CALCULATIONS
tank_radius = tank_diameter/2; % finding tank radius
Length_cylindrical_section = (total_tank_length - (2*tank_radius)); % finding length of cylindrical section
% using variables A, B and C to calculate the total tank volume
A = ((pi*(tank_diameter)^2) *((3*tank_radius) - tank_diameter)/3);
B = ((tank_radius)^2) * (acos((tank_radius -tank_diameter)/tank_radius));
C = (tank_radius) - (tank_diameter)*(sqrt((2*tank_radius*tank_diameter)- (tank_diameter)^2));
tank_volume = A+Length_cylindrical_section*(B-C);
% using fluid heights to find total volume tolerance
fluid_height1 = tank_radius + (0.5*fluid_height_increment);
fluid_height2 = tank_radius - (0.5*fluid_height_increment);
v_tol = (tank_volume * (fluid_height1)) - (tank_volume * (fluid_height2));
for fluid_height = 0
A = ((pi*(fluid_height)^2) *((3*tank_radius) - fluid_height)/3);
B = ((tank_radius)^2) * (acos((tank_radius - fluid_height)/tank_radius));
C = (tank_radius) - (fluid_height)*(sqrt((2*tank_radius*fluid_height)- (fluid_height)^2));
fluid_volume = A+Length_cylindrical_section*(B-C);
fluid_height1 = tank_radius + (0.5*fluid_height_increment);
fluid_height2 = tank_radius - (0.5*fluid_height_increment);
v_tol = (fluid_volume * (fluid_height1)) - (fluid_volume * (fluid_height2));
Number_loops =0;
while fluid_volume <= (tank_volume - v_tol )
Fluid_height = fluid_height + fluid_height_increment;
Number_loops = Number_loops +1;
else Number_loops = Number_loops +1;
fprintf('The final fluid volume is %.2f m^3. /n' , fluid_volume);
end
disp('The number of iterations are %.0f' , Number_loops);
disp('The safe fill volume is %.2f m^3.' , v_tol);
disp('The final fluid volume is %.2f m^3.' , fluid_volume);
plot (fluid_volume ,fluid_height);
xlabel = 'Fluid Height [m]';
ylabel = 'Fluid Volume [m^3]' ;
title = ' Fluid Volume vs Fluid Height';
end
##### 3 CommentsShow 2 older commentsHide 2 older comments
Eti Rastogi on 14 Sep 2020
sorry about that and thank u

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### Answers (1)

Ayush Gupta on 17 Sep 2020
The problem here is with the syntax of while loop, where else is being used inside while loop without using if first. Read about the documentation of while loop and how to use it, here. Refer to the following code on the changes to make:
while fluid_volume <= (tank_volume - v_tol )
Fluid_height = fluid_height + fluid_height_increment;
Number_loops = Number_loops +1;
%else Number_loops = Number_loops +1;
%fprintf('The final fluid volume is %.2f m^3. /n' , fluid_volume);
end
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