input

Prompt for user input

Usage

input(prompt)

a = input(prompt)

• When the function is executed, the user is prompted to enter a one-line expression in the Console. The program is paused until the user has input an expression.
• The argument prompt should be a character array, which will be shown to the user as prompt message.
• The expression entered by the user are evaluated. ⚠️ The expression must return a value and must not run a script.
• If the user enters an empty expression or whitespaces, an empty array is returned.
• The output argument a stores the value obtained by evaluating the expression entered by the user.

input(prompt, 's')

a = input(prompt, 's')

• The expression input by the user is not evaluated, and is returned as a character array stored in a.
• The second input argument should always be the character 's'.
• The input prompt should be a character array, which will be shown to the user as prompt message.
• If user enters an empty expression or whitespaces, an empty array is returned.

Examples

• The user is asked to entered a number, which will then be assigned to the variable num and displayed in the console.

Input

num=input('Pls enter a number:');
disp('The number is:')
disp(num)

Output

% Output
Pls enter a number:

1;

The number is:

 1.000

• The user input is returned as the character array fact and is then displayed using disp().

Input

fact=input('Pls tell me a fact:','s');
disp(['You have told me: ' fact])

Output

Pls tell me a fact:

The sky is blue

You have told me: The sky is blue

• The user is asked to enter a number, and then told to confirm the input. If the input is 20, then the user is right.

Input

while true
    age=input('Guess my age');
    disp(['You have entered ' num2str(age)]);
    confirm=input('Confirm? [true/false]');
    if confirm
        if age == 20
            disp('Great! You are right')
        else
            disp('Sorry. You are wrong')
        end
        break
    end
end

Output

Guess my age

20;

You have entered 20.00

Confirm? [true/false]

true;

Great! You are right

• The user is asked to enter an expression, which is then evaluated.

Input

a=input('Enter an expression:');
disp(['the result is ' num2str(a)])

Output

Enter an expression:

1+3/4;

the result is 1.750