Casa Modelo

<form name="calculator" class="Estilo15" >

Solution<input type="textfield" name="ans" value="">

<br>

<input type="button" value="1" onClick="document.calculator.ans.value+='1'">

<input type="button" value="2" onClick="document.calculator.ans.value+='2'">

<input type="button" value="3" onClick="document.calculator.ans.value+='3'">

<input type="button" value="+" onClick="document.calculator.ans.value+='+'">

<br>

<input type="button" value="4" onClick="document.calculator.ans.value+='4'">

<input type="button" value="5" onClick="document.calculator.ans.value+='5'">

<input type="button" value="6" onClick="document.calculator.ans.value+='6'">

<input type="button" value="-" onClick="document.calculator.ans.value+='-'">

<br>

<input type="button" value="7" onClick="document.calculator.ans.value+='7'">

<input type="button" value="8" onClick="document.calculator.ans.value+='8'">

<input type="button" value="9" onClick="document.calculator.ans.value+='9'">

<input type="button" value="*" onClick="document.calculator.ans.value+='*'">

<br>

<input type="button" value="0" onClick="document.calculator.ans.value+='0'">

<input type="reset" value="Reset">

<input type="button" value="=" onClick="document.calculator.ans.value=eval(document.calculator.ans.value)">

                                                                            </form>