if an answer is equall to 0 return a message that says "invalid year"" in matlab

You can use an if statement to check if the answer is equal to 0 and return a message using string manipulation in MATLAB. Here's an example code block:

main.m
answer = 0;

if answer == 0
    message = "invalid year";
    disp(message);
end
81 chars
7 lines

In this code, we first set the variable answer to 0. The if statement checks if answer is equal to 0 using the logical operator ==. If this condition is true, we set the variable message to the string "invalid year". Finally, we display the message using the built-in disp() function.

You can modify the code to use your desired value for answer instead of 0. You can also customize the message to better suit your needs.