By DoruMolnar on Mar 13, 2016I make an calculator for html:
<html><head></head><body bgcolor="#000000" text="gold"><input type="button" value="-" onclick="document.calculator.ans.value+='-'">
<title>Calculator</title>
<form name="calculator">
<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+='+'">
<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+='-'">
<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+='*'">
<input type="button" value="/" onclick="document.calculator.ans.value+='/'">
<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)">
<br>Solution is <input type="textfield" name="ans" value="">
</form>
</body>
</html>