Using while statements to create a loop if a value entered is not correct

Question

Cizzxr 2021-2-12

0
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https://ww2.mathworks.cn/matlabcentral/answers/743967-using-while-statements-to-create-a-loop-if-a-value-entered-is-not-correct

回答： Walter Roberson 2021-2-13

So im writing a code right now which prompts the user to enter the a number from 1-3. ive created a while statement which creates a loop and prompts them to type the value in again untill its either 1 2 or 3. However when i run the code and type in 2 for example, which is a correct number, its staying in the loop as if ive entered a wrong number. The only number which gets me out of the loop is when i use the number one. I feel like my while statement is incorrect, Here is the code: (ignore the MaxT and MinT)

case 1
        MaxT = 0; MinT = 0;
        disp('You have chosen average time to complete')
        prompt = ['Please type which cube you would like\n<strong>Option 1:' ...
            '</strong>2x2\n<strong>Option 2:</strong>3x3\n<strong>Option 3:</strong>4x4'];
        cube_choice_avg_time = input(prompt);
        
        while cube_choice_avg_time ~= 1;2;3;
            prompt = ['You need to enter a value of 1,2 or 3\nPlease type ' ...
                'which cube you would like\n<strong>Option 1:</strong>2x2\n<strong>Option 2:' ...
                '</strong>3x3\n<strong>Option 3:</strong>4x4'];
        cube_choice_avg_time = input(prompt);
        end
        
        if  cube_choice_avg_time == 1
            Full_cube_data = xlsread("Full_Cube_data.xlsx");
            specific_data = Full_cube_data(73:108);
            Avg = mean(specific_data);
            disp(['Average Time (s) = ', num2str(Avg)])
            
        elseif cube_choice_avg_time == 2
            Full_cube_data = xlsread("Full_Cube_data.xlsx");
            specific_data = Full_cube_data(37:72);
            Avg = mean(specific_data);
            disp(['Average Time (s) = ', num2str(Avg)])
            
        elseif cube_choice_avg_time == 3
            Full_cube_data = xlsread("Full_Cube_data.xlsx");
            specific_data = Full_cube_data(1:36);
            Avg = mean(specific_data);
            disp(['Average Time (s) = ', num2str(Avg)])
                   
        end