Web development

Web development

Please help me formulate code for the following

I have three textboxes.The first two textboxes has to carryout Addition or subtraction of two numbers entered and show the result in the third box as soon we take d cursor out of the textbox in both text boxes. If the user enters +1200 in first text box -600 in second text box It should show +600 in third text box. In this way it should accept "+" for addition and "-_ for subtraction and carryout the operation accordingly. Please help with the code. Thank you

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