Question

Please show in MATLAB code using if and else statements if necessary

Write a program in a script file that converts a quantity of energy given in units of either J (Joules), Btu, or (ft-lb) to the equivalent quantity in different units specified by the user. The program asks the user to enter the quantity of energy, its current units, and the new desired units. The output is the quantity of power in the new units using the fprintf command.
Conversion factors are: 1

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Homework Answers

Answer #1

Matlab code

============================================================================================

energy=input('enter the quantity of energy: ');

u1=input('enter current unit of enenry (Joules), (Btu), or (ft-lb) ','s');

u2=input('enter new desired units(Joules), (Btu), or (ft-lb) ','s');

%input unit is Joules
if(strcmpi(u1,'Joules'))
if(strcmpi(u2,'Btu'))
output=energy*9.478*10^-4;
elseif(strcmpi(u2,'ft-lb'))
output=energy*0.7376;
end
elseif(strcmpi(u1,'Btu')) %input unit is Btu
if(strcmpi(u2,'Joules'))
output=energy* 1055.05585262;
elseif(strcmpi(u2,'ft-lb'))
joules=energy* 1055.05585262;
output=joules*0.7376;
end
elseif(strcmpi(u1,'ft-lb')) %input unit is ft-lb
if(strcmpi(u2,'Joules'))
output=energy*1.35582;
elseif(strcmpi(u2,'Btu'))
joules=energy*1.35582;
output=joules*9.478*10^-4;
end
end

fprintf('energy in %s is %f\n',u2,output);

============================================================================================

Output

MAILAB R2018a PUE ISH Lng h Find Files Compare ▼ Print Run Sect on Go To, Comment % SFnd▼ Naw Cpen Save Breakpoints Run Run and Adance Run and Indent Aavance Current Foilder Editer-CAUsersikaialleergy.corvertum Name Narne Value 3000 406 58+03 3.8551 L-lb Rtu joules=는nergy 1055.05535262; output-joules*.7376 H İ .dnx cnergy oules eclipse 囝 」.idlerc 20- end .matplutlib Mendeley Desktop outputzenergy 1.35582; QWelbEnginePracess E İ .tooling joules-energy1.35582: vscode output-ioules 9.47810-4 3D Objects and ansel Contacts Desktop 2-end 29 30- tprintt{ , energy in %s is trn,,u2, output); Downloads Command Window Favorites Links >> eeryy_convert enter the quantity of energy: 1500 enter current unit ot enenry oules) Btu,or tc-lb) Joules enter new desired units(Joules), 1Btu), or (ft lb》 Btu anergy in Bt .421700 >> eeryy_convert enter the quantity of energy:6 enter current unit ot enenry oules), Btu,or (tc-lb) Btu antor new desired units (Joulos), Btu, or (fs-lb Joulos anergy in Joles is 6330.335116 >> eeryy_convert enter the quantity of energy: 3000 enter current unit ot enenry oules), Btu,or (tc-lb) it-lb antor now desired units (Joulos), Btu, or (ft-lb Btu anergy in Ptu in 3.855139 Music Pictures Rcaming Saved Games Searches Select file tc view details onpt Ln 35 Coll 1105 AM O Type here to search ^ 1 d. ENG 26-03-2019

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Answer 1

Matlab code

============================================================================================

energy=input('enter the quantity of energy: ');

u1=input('enter current unit of enenry (Joules), (Btu), or (ft-lb) ','s');

u2=input('enter new desired units(Joules), (Btu), or (ft-lb) ','s');

%input unit is Joules
if(strcmpi(u1,'Joules'))
if(strcmpi(u2,'Btu'))
output=energy*9.478*10^-4;
elseif(strcmpi(u2,'ft-lb'))
output=energy*0.7376;
end
elseif(strcmpi(u1,'Btu')) %input unit is Btu
if(strcmpi(u2,'Joules'))
output=energy* 1055.05585262;
elseif(strcmpi(u2,'ft-lb'))
joules=energy* 1055.05585262;
output=joules*0.7376;
end
elseif(strcmpi(u1,'ft-lb')) %input unit is ft-lb
if(strcmpi(u2,'Joules'))
output=energy*1.35582;
elseif(strcmpi(u2,'Btu'))
joules=energy*1.35582;
output=joules*9.478*10^-4;
end
end

fprintf('energy in %s is %f\n',u2,output);

============================================================================================

Output

MAILAB R2018a PUE ISH Lng h Find Files Compare ▼ Print Run Sect on Go To, Comment % SFnd▼ Naw Cpen Save Breakpoints Run Run and Adance Run and Indent Aavance Current Foilder Editer-CAUsersikaialleergy.corvertum Name Narne Value 3000 406 58+03 3.8551 L-lb Rtu joules=는nergy 1055.05535262; output-joules*.7376 H İ .dnx cnergy oules eclipse 囝 」.idlerc 20- end .matplutlib Mendeley Desktop outputzenergy 1.35582; QWelbEnginePracess E İ .tooling joules-energy1.35582: vscode output-ioules 9.47810-4 3D Objects and ansel Contacts Desktop 2-end 29 30- tprintt{ , energy in %s is trn,,u2, output); Downloads Command Window Favorites Links >> eeryy_convert enter the quantity of energy: 1500 enter current unit ot enenry oules) Btu,or tc-lb) Joules enter new desired units(Joules), 1Btu), or (ft lb》 Btu anergy in Bt .421700 >> eeryy_convert enter the quantity of energy:6 enter current unit ot enenry oules), Btu,or (tc-lb) Btu antor new desired units (Joulos), Btu, or (fs-lb Joulos anergy in Joles is 6330.335116 >> eeryy_convert enter the quantity of energy: 3000 enter current unit ot enenry oules), Btu,or (tc-lb) it-lb antor now desired units (Joulos), Btu, or (ft-lb Btu anergy in Ptu in 3.855139 Music Pictures Rcaming Saved Games Searches Select file tc view details onpt Ln 35 Coll 1105 AM O Type here to search ^ 1 d. ENG 26-03-2019