Question

MATLAB QUESTION

8) Create a program that first prompts the user to enter any two numbers. Then prompt the user again to input as many numbers as they choose. Stop the program by inputting-1. Then, display the largest number and second largest number in the command window once the user kills the program. The built-in max function cannot be used. The figure below is an example of what the command window should look like when the code is ran. First enter two numbers x (1) and (2) 1 2 Now enter as many numbers as you'd like, enter -1 to kill program 6 3 5 -1 The largest number is: 6 The second largest number is: 5

Answer 1

In the question, whether to take the -1 as a element of array or not is not mentioned. So I consider the both cases.

Not considering the -1 as an element in the array x:

x=[];
fprintf('First enter two numbers x(1) and x(2)\n');

x(1) =input('');

x(2) = input('');

fprintf('Now enter as many numbers as you''d like, enter -1 to kill program.\n');

i=2;
while ~(x(i)==-1)
    i=i+1;
    x(i) = input('');
end

len = length(x)-1;
x=x(1:len);

for i=1:len
    for j=1:len-i
        if x(j)>x(j+1)
            dup=x(j);
            x(j)=x(j+1);
            x(j+1)=dup;
        end
    end
end

fprintf('The largest number is: %d\n',x(end));
fprintf('The second largest number is: %d\n',x(end-1));

We make use of bubble sorting operation to sort the array. So the largest and second largest number lies at the end , and second last of the array.

Considering -1 as a input:

x=[];
fprintf('First enter two numbers x(1) and x(2)\n');

x(1) =input('');

x(2) = input('');

fprintf('Now enter as many numbers as you''d like, enter -1 to kill program.\n');

i=2;
while ~(x(i)==-1)
    i=i+1;
    x(i) = input('');
end
len=length(x);

for i=1:len
    for j=1:len-i
        if x(j)>x(j+1)
            dup=x(j);
            x(j)=x(j+1);
            x(j+1)=dup;
        end
    end
end

fprintf('The largest number is: %d\n',x(end));
fprintf('The second largest number is: %d\n',x(end-1));

Although output is not effected by this. Output is common for both the cases.

Some results of the above code.

Hope you got the answer. If you have any doubts regarding this answer please try to comment, I will help you with that.

Thank you and don't forget to upvote the answer.