While loop with if function

2021 1 30
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更新时间：2021 2 2
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Hi, need some help on whie loop and if function.
E.g,
Amount =$1-500
type = a or b
How should I write in mathlab, if I wan if the amount between 1-500 and if the type is "a" then show the 'a" result else showing "b" result. And after that will ask whether user want to continue the process or not.

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Walter Roberson
Walter Roberson 2021-1-30

0 个投票

if 1 <= amount & amount <= 500 & strcmp(type, 'a')

9 个评论
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Ken L
Ken L 2021-1-30
Thanks Walter, what if in the end I need to ask whether user whether wan to continue input or not, may I know how to do it?
eg,
After the function and showed out the result, I will ask a question that whether user want to continur or not, if 'Y' then continue to input, and if 'N' then exit.
Walter Roberson
Walter Roberson 2021-1-30
want_to_continue = input('Would you like to continue? Y|[N] ', 's');
and now you can strcmp() or strcmpi()
Ken L
Ken L 2021-1-31
Thanks Walter, will try it out.
Walter Roberson
Walter Roberson 2021-2-1
while true
if strcmpi(purchase_type, "D") && purchase_amount >= 0 && purchase_amount <=250
discount = 0.95;
net_amount = purchase_amount*discount;
break;
elseif strcmpi(purchase_type, "D") || strcmpi(purchase_type, "L")
discount = 0.9;
net_amount = purchase_amount*discount;
break
else
purchase_type = input("Enter type of purchase (L for type L/ D for Type D):","s");
end
end
Ken L
Ken L 2021-2-1
Hi Walter, thanks for your quick response, I had tried your code and its working perfectly, may I have 1 more question. If I want to ask user input after every result was printed out, may I know where should I add into?
E.g,
result:
name: jamal
address: USA
net amount: 100
Do you wish to continue?: (userinput) if yes then continue the loop, if no then exit.
Walter Roberson
Walter Roberson 2021-2-1
while true
do all you stuff
cont = input('Do you wish to continue?: (userinput) if yes then continue the loop, if no then exit. ', 's')
if ~strcpmi(cont, 'y') && ~strcmpi(cont, 'yes')
break;
end
end
This considers anything other than y or yes to be no.
Ken L
Ken L 2021-2-1
Hi Walter, the following is my code, and it worked great for now, but I still have no idea where should I input the question once the result is printed out. Because each time it prined out then just stop.
clc;
clear;
name = input("Enter name:","s");
address = input("Enter address:","s");
purchase_amount = input("Enter amount of purchase:");
purchase_type = input("Enter type of purchase (L for type L/ D for type D):","s");
while true
if strcmpi(purchase_type, "D") && purchase_amount >= 0 && purchase_amount <= 250
discount = 0.95;
net_amount = purchase_amount*discount;
break
elseif strcmpi(purchase_type, "D") && purchase_amount >= 251 && purchase_amount <= 570
discount = 0.924;
net_amount = purchase_amount*discount;
break
elseif strcmpi(purchase_type, "D") || strcmpi(purchase_type, "L")&& purchase_amount >= 0 && purchase_amount <= 250
discount = 1;
net_amount = purchase_amount*discount;
break
elseif strcmpi(purchase_type, "D") || strcmpi(purchase_type, "L")&& purchase_amount >= 251 && purchase_amount <= 570
discount = 0.95;
net_amount = purchase_amount*discount;
break;
else
fprintf ("Invalid type.\n")
prompt = input("Do you wish to continue to purchase (Y for Yes/ N for No):","s");
if strcmpi(prompt, "Y") == true
name = input("Enter name:","s");
address = input("Enter address:","s");
purchase_amount = input("Enter amount of purchase:");
purchase_type = input("Enter type of purchase (L for type/ D for typed):","s");
else
fprintf ("Goodbye.\n")
end
end
end
fprintf("Name: %s\n",name);
fprintf("Address: %s\n",address);
fprintf("Net Amount: $%d\n",net_amount);
Walter Roberson
Walter Roberson 2021-2-1
while true
name = input("Enter name:","s");
address = input("Enter address:","s");
purchase_amount = input("Enter amount of purchase:");
purchase_type = input("Enter type of purchase (L for type L/ D for type D):","s");
fail = false;
if strcmpi(purchase_type, "D") && purchase_amount >= 0 && purchase_amount <= 250
discount = 0.95;
net_amount = purchase_amount*discount;
elseif strcmpi(purchase_type, "D") && purchase_amount >= 251 && purchase_amount <= 570
discount = 0.924;
net_amount = purchase_amount*discount;
elseif strcmpi(purchase_type, "D") || strcmpi(purchase_type, "L")&& purchase_amount >= 0 && purchase_amount <= 250
discount = 1;
net_amount = purchase_amount*discount;
elseif strcmpi(purchase_type, "D") || strcmpi(purchase_type, "L")&& purchase_amount >= 251 && purchase_amount <= 570
discount = 0.95;
net_amount = purchase_amount*discount;
else
fprintf ("Invalid type.\n")
fail = true;
end
if ~fail
fprintf("Name: %s\n",name);
fprintf("Address: %s\n",address);
fprintf("Net Amount: $%d\n",net_amount);
end
prompt = input("Do you wish to continue to purchase (Y for Yes/ N for No):","s");
if ~strcmpi(prompt, 'Y')
break;
end
end
fprintf("Goodbye.\n");
Ken L
Ken L 2021-2-2
Hi Walter, thank you very much, the code worked perfectly, really appreciate your help.

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