Write an if statement inside of a while loop to check for a positive, negative, or zero number entered by the user. Stop if the user enters zero.

Question

Mark Dillon 2015-7-14

0
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回答： bio lim 2015-7-14

• Start with an if statement: Write a script that first asks the user for a number (using the input command). Then, using an if statement, print out if this number is positive, negative or zero. Test your script a few times to make sure it does the right thing for all three cases.

• Now move your if statement and put it in a for loop that asks the user for input 10 times so you don’t have to keep calling the script by hand. Remember that control-c in the command window will stop the loop.

• Now change the for loop to a while loop that stops when the user inputs zero. What should your stopping condition be?

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Answer 1

bio lim 2015-7-14

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1.

 prompt = 'Insert a number: ';
 x = input(prompt);
 if x < 0 
    fprintf('Your input is negative number %f.\n', x);
 end
 if x >= 0
    fprintf('Your input is positive number %f.\n', x);
    if x == 0
        fprintf('The number you inserted is zero.\n')
    end
 end