make a popup four function calculator in matlab

main.m
function popup_calculator
    % Create figure and UI elements
    fig = uifigure('Position', [100 100 250 300]);
    num_box = uitextarea(fig, 'Value', '0', 'Position', [25 250 200 30]);
    button_1 = uibutton(fig, 'push', 'Position', [25 200 50 50], 'Text', '1', 'ButtonPushedFcn', @(btn,event) num_button(btn, event, num_box));
    button_2 = uibutton(fig, 'push', 'Position', [100 200 50 50], 'Text', '2', 'ButtonPushedFcn', @(btn,event) num_button(btn, event, num_box));
    button_3 = uibutton(fig, 'push', 'Position', [175 200 50 50], 'Text', '3', 'ButtonPushedFcn', @(btn,event) num_button(btn, event, num_box));
    button_4 = uibutton(fig, 'push', 'Position', [25 150 50 50], 'Text', '4', 'ButtonPushedFcn', @(btn,event) num_button(btn, event, num_box));
    button_5 = uibutton(fig, 'push', 'Position', [100 150 50 50], 'Text', '5', 'ButtonPushedFcn', @(btn,event) num_button(btn, event, num_box));
    button_6 = uibutton(fig, 'push', 'Position', [175 150 50 50], 'Text', '6', 'ButtonPushedFcn', @(btn,event) num_button(btn, event, num_box));
    button_7 = uibutton(fig, 'push', 'Position', [25 100 50 50], 'Text', '7', 'ButtonPushedFcn', @(btn,event) num_button(btn, event, num_box));
    button_8 = uibutton(fig, 'push', 'Position', [100 100 50 50], 'Text', '8', 'ButtonPushedFcn', @(btn,event) num_button(btn, event, num_box));
    button_9 = uibutton(fig, 'push', 'Position', [175 100 50 50], 'Text', '9', 'ButtonPushedFcn', @(btn,event) num_button(btn, event, num_box));
    button_0 = uibutton(fig, 'push', 'Position', [100 50 50 50], 'Text', '0', 'ButtonPushedFcn', @(btn,event) num_button(btn, event, num_box));
    button_add = uibutton(fig, 'push', 'Position', [25 50 50 50], 'Text', '+', 'ButtonPushedFcn', @(btn,event) add_button(btn, event, num_box));
    button_sub = uibutton(fig, 'push', 'Position', [175 50 50 50], 'Text', '-', 'ButtonPushedFcn', @(btn,event) sub_button(btn, event, num_box));
    button_mul = uibutton(fig, 'push', 'Position', [25 0 50 50], 'Text', '*', 'ButtonPushedFcn', @(btn,event) mul_button(btn, event, num_box));
    button_div = uibutton(fig, 'push', 'Position', [175 0 50 50], 'Text', '/', 'ButtonPushedFcn', @(btn,event) div_button(btn, event, num_box));
    button_equal = uibutton(fig, 'push', 'Position', [100 0 50 50], 'Text', '=', 'ButtonPushedFcn', @(btn,event) equal_button(btn, event, num_box));
    
    % Callback functions for buttons
    function num_button(~, ~, num_box)
        num_box.Value = strcat(num_box.Value, get(gco, 'Text'));
    end

    function add_button(~, ~, num_box)
        num_box.Value = strcat(num_box.Value, '+');
    end

    function sub_button(~, ~, num_box)
        num_box.Value = strcat(num_box.Value, '-');
    end

    function mul_button(~, ~, num_box)
        num_box.Value = strcat(num_box.Value, '*');
    end

    function div_button(~, ~, num_box)
        num_box.Value = strcat(num_box.Value, '/');
    end

    function equal_button(~, ~, num_box)
        num_box.Value = num2str(eval(num_box.Value));
    end
end
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