Switch Case or if-else?
显示 更早的评论
Hello,
I'm writing a script which calculates a value of "R" which is then compared to several inequality limits. The limits are:
R <= 1.2
1.2 < R <= 1.45
1.45 < R <= 1.66
1.66 < R <= 1.93
R > 1.93
Once R satisfies the conditional statement a subroutine is prompted and 1 of 5 subsequent scripts is run.
Is switch case or if-else better for this?
采纳的回答
Atsushi Ueno
2021-5-21
Switch statement cannot judge the range of R. It may be possible but it must be very tricky.
- A case_expression cannot include relational operators such as < or > for comparison against the switch_expression. To test for inequality, use if, elseif, else statements.
if (R <= 1.2)
disp('if-else condition 1');
elseif (R <= 1.45)
disp('if-else condition 2');
elseif (R <= 1.66)
disp('if-else condition 3');
elseif (R <= 1.93)
disp('if-else condition 4');
else % R > 1.93
disp('if-else condition 5');
end
I would use this method.
index = find(R <= [1.2 1.45 1.66 1.93 inf], 1, 'first');
disp(['if-else condition ' num2str(index)]);
4 个评论
Sean Rubino
2021-5-21
Sean Rubino
2021-5-21
Atsushi Ueno
2021-5-21
Thank you.
I don't know what script you are writing is. Is it MATLAB function? or other language script?
Please show something about what you are writing, at least interface...
Sean Rubino
2021-5-21
更多回答（2 个）
Dyuman Joshi
2021-5-21
2 个投票
if-else would be better in this case because you have a range of values of R (a variable).
switch is useful when you have descrete values of a variable.
Stephen23
2023-7-18
"Switch statement cannot judge the range of R. It may be possible but it must be very tricky."
switch true
case R <= 1.2
disp('condition 1');
case R <= 1.45
disp('condition 2');
case R <= 1.66
disp('condition 3');
case R <= 1.93
disp('condition 4');
otherwise % R > 1.93
disp('condition 5');
end
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