(JAVASCRIPT) if - else & switch

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	<!doctype html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Untitled Document</title>
	</head>

	<body>
	<script type="text/javascript">
	a = parseInt(prompt("Nhap vao so a: ", " "));
	b = parseInt(prompt("Nhap vao so b: ", " "));
	pt = prompt("Nhap vao phep tinh ma ban muon tinh ( +, -, *, /) ");
	tong=a+b;
	hieu=a-b;
	nhan=a*b;
	chia=a/b;

	/*//xuat ket qua
	if(c == "+")
	document.write("Ket qua " +a+ " " +pt+ " " +b+ " = " +tong);
	else if(c == "-")
	document.write("Ket qua " +a+ " " +pt+ " " +b+ " = " +hieu);
	else if(c == "*")
	document.write("Ket qua " +a+ " " +pt+ " " +b+ " = " +nhan);
	else
	document.write("Ket qua " +a+ " " +pt+ " " +b+ " = " +chia);
	//else if(c!="+" && c!="-" && c!="*" && c!="/");
	//document.write("Ban nhap sai phep tinh roi: ");*/
	switch(pt)
	{
	case "+" : document.write("Ket qua " +a+ " " +pt+ " " +b+ " = " +tong);
	break;
	case "-" : document.write("Ket qua " +a+ " " +pt+ " " +b+ " = " +hieu);
	break;
	case "*" : document.write("Ket qua " +a+ " " +pt+ " " +b+ " = " +nhan);
	break;
	case "/" : if(b==0)
	document.write(alert ("b phải khác không mới tính được"));
	else
	document.write("Ket qua " +a+ " " +pt+ " " +b+ " = " +chia);
	break;
	default: document.write("Ban nhap sai phep tinh.");
	}
	</script>
	</body>
	</html>

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