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Need a better solution than "try-catch" statement to find an intentional error in input arguments

1 次查看（过去 30 天）
DJ V
DJ V 2016-11-29
关闭： MATLAB Answer Bot 2021-8-20
I know there are a lot of handy matlab functions that do what I must program, but I'm not allowed to use them. I need to be able to detect if the user enters the wrong data to the following. One of the test statements is:
y = day_diff(12,3,[3 4],5)
This obviously produces an error and my attempt to use "try-catch" in the code doesn't work. Does anyone have any ideas about how to catch this?
My code is:
function days= day_diff(M1,D1,M2,D2)
if nargin('day_diff') >4
days=-1;
return;
end
if D1<1 ||D2 <1
days = -1;
return;
end
try a = (M1 - floor(M1));
catch days =-1;
return;
end
try b = (M2 - floor(M2));
catch days = -1;
return;
end
try c = (D1 - floor(D1));
catch days =-1;
return;
end
try d = (D2 - floor(D2));
catch days = -1;
return;
end
if a ~=0 || b~=0
days =-1;
return;
end
if c ~=0 ||d~=0
days =-1;
return;
end
if isa(M1,'double') ~=1 || isa(D1,'double') ~=1 || isa(M2,'double') ~=1 || isa(M2,'double')~=1;
days = -1
return;
end
if M2 <1||M2 >12
days = -1;
return;
end
if M2 == 2 && D2 >28 || D2<1
days = -1;
return;
elseif (M2 == 4 || M2==6||M2==9||M2==11) && (D2>30 ||D2<1)
days = -1
return;
elseif D2 >31||D2<1
days = -1;
return;
end
if M1 <1||M1 >12
days = -1;
return;
end
if M1 == 2 && D1>28 || D1<1
days = -1;
return;
elseif M1 == 4 || M1==6||M1==9||M1==11 && D1>30 ||D1<1
days = -1
return;
elseif D1 >31||D1<1
days = -1;
return;
end
if M2<M1
M = M1;
M1 = M2;
M2 = M;
D = D1;
D1 = D2;
D2 = D;
end
if M1<M2
count=M1;
total=0;
if count<M2
if count==4 ||count==6||count==9||count==11
length=30;
elseif count==2
length = 28;
else
length=31;
end
total=total+length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
elseif count==2
length = 28;
else
length = 31;
end
total = total +length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
elseif count==2
length = 28;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
elseif count==2
length = 28;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
elseif count==2
length = 28;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
elseif count==2
length = 28;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
elseif count==2
length = 28;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
elseif count==2
length = 28;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
elseif count==2
length = 28;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
elseif count==2
length = 28;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
elseif count==2
length = 28;
else
length = 31;
end
total = total + length;
end
count = count +1;
if count <M2
if count ==4||count==6||count==9||count==11
length = 30;
elseif count==2
length = 28;
else
length = 31;
end
total = total + length;
end
end
if M1==M2 && D1==D2
days=0;
return;
end
if M1==M2 && D2>=D1
days= D2-D1;
end
if M1==M2 &&D1>=D2
days = D1-D2
end
if M1+1==M2
if M1 ==4||M1==6||M1==9||M1==11
length=30;
elseif M1==2
length = 28;
else
length=31;
end
days=length-D1+D2;
return;
end
if round(M2+1)==round(M1)
if M1 ==4||M1==6||M1==9||M1==11
length=30;
elseif M1==2
length = 28;
else
length=31;
end
days=length-D2+D1;
end
if round(M1+1)==round(M2)
if M1 ==4||M1==6||M1==9||M1==11
length=30;
elseif M1==2
length = 28;
else
length=31;
end
days=length-D1+D1;
return;
end
if M2>M1 && M1+1 ~=M2
days=total-D1+D2;
end
  4 个评论
显示 2更早的评论
KSSV
KSSV 2016-11-29
I would prefer, running the code without try and catch; let the matlab stop and show me the error, so that I can change my code.
Walter Roberson
Walter Roberson 2016-11-29
This is a school assignment where the programmer is responsible for detecting all possible errors and handling them smoothly. try/catch can be appropriate in some cases, especially if the programmer is forbidden from using some constructs that might allow the problems to be avoided.

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