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Com o resultado no fim!
<html> <CENTER> <FORM NAME="Calc"> <TABLE BORDER=4 WIDTH="155" bgcolor="green"> <TR> <TD ALIGN="CENTER"> <INPUT TYPE="text" NAME="Input" SIZE="16"> </TD> </TR> <TR> <TD ALIGN="CENTER"> <INPUT TYPE="button" NAME="one" VALUE=" 1 " onClick="Calc.Input.value += '1'"> <INPUT TYPE="button" NAME="two" VALUE=" 2 " onClick="Calc.Input.value += '2'"> <INPUT TYPE="button" NAME="three" VALUE=" 3 " onClick="Calc.Input.value += '3'"> <INPUT TYPE="button" NAME="plus" VALUE=" + " onClick="Calc.Input.value += ' + '"> <BR> <INPUT TYPE="button" NAME="four" VALUE=" 4 " onClick="Calc.Input.value += '4'"> <INPUT TYPE="button" NAME="five" VALUE=" 5 " onClick="Calc.Input.value += '5'"> <INPUT TYPE="button" NAME="six" VALUE=" 6 " onClick="Calc.Input.value += '6'"> <INPUT TYPE="button" NAME="minus" VALUE=" - " onClick="Calc.Input.value += ' - '"> <BR> <INPUT TYPE="button" NAME="seven" VALUE=" 7 " onClick="Calc.Input.value += '7'"> <INPUT TYPE="button" NAME="eight" VALUE=" 8 " onClick="Calc.Input.value += '8'"> <INPUT TYPE="button" NAME="nine" VALUE=" 9 " onClick="Calc.Input.value += '9'"> <INPUT TYPE="button" NAME="times" VALUE=" x " onClick="Calc.Input.value += ' * '"> <BR> <INPUT TYPE="button" NAME="clear" VALUE=" c " onClick="Calc.Input.value = ''"> <INPUT TYPE="button" NAME="zero" VALUE=" 0 " onClick="Calc.Input.value += '0'"> <INPUT TYPE="button" NAME="DoIt" VALUE=" = " onClick="Calc.Input.value = eval(Calc.Input.value)"> <INPUT TYPE="button" NAME="div" VALUE=" / " onClick="Calc.Input.value += ' / '"> </TD> </TR> </TABLE> </FORM> </CENTER> </html>
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Ficaria assim: