If statements and strcmp function

Question

Spaceman 2024-3-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2097091-if-statements-and-strcmp-function

评论： Spaceman 2024-3-21

Given: strcmp = matching case, strcmpi=ignoring case

Find: Prompt user to enter an angle; prompt user to determine if the angle was provided in degrees or radians; write an if statement that calculates the sine of the angle using the sin function if the units were in radians or sind if the units were degrees.

Issue: I created a flow chart, wrote my code, but it's not giving me what I want, grrrrr. Shows the same output for degrees and radians.

My solution:

angle=input('Enter an angle: ');
units=input('Is it in degrees or radians? ','s');
if sin(angle) % if 45 degrees should be 0.0123413415 radians
    fprintf('The sine of your angle is %3.1f %s.\n',sin(angle),units)
elseif sind(angle) % if 45 degrees should be sqrt(2)/2=0.7071
    fprintf('The sine of your angle is %3.1f %s.\n',sind(angle),units)
end

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Answer 1

Hassaan 2024-3-21

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2097091-if-statements-and-strcmp-function#answer_1428771

在 MATLAB Online 中打开

angle = input('Enter an angle: ');
units = input('Is it in degrees or radians? ', 's');
% Normalize the case of the user input for units to ensure case-insensitive comparison
units = lower(units); 
% Compare the input string for units and compute the sine accordingly
if strcmp(units, 'radians')
    % User specified radians, use sin function
    result = sin(angle);
    fprintf('The sine of your angle in radians is %.4f.\n', result);
elseif strcmp(units, 'degrees')
    % User specified degrees, use sind function
    result = sind(angle);
    fprintf('The sine of your angle in degrees is %.4f.\n', result);
else
    % Handle unexpected unit input
    fprintf('Unknown units. Please specify "degrees" or "radians".\n');
end

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Spaceman 2024-3-21

Eureka! I especially like how you normalized with the lower function so that it wasn't going to be messed up by capitalizing something on accident and also including the else line to handle unexpected unit input, like someone entering fart instead of degrees. Thank you.

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