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eval.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="./eval.js"></script>
<script
src="https://code.jquery.com/jquery-3.2.1.js"
integrity="sha256-DZAnKJ/6XZ9si04Hgrsxu/8s717jcIzLy3oi35EouyE="
crossorigin="anonymous"></script>
</head>
<body>
<script>
exp = {"LETV":[
"x",
{"NUM":[
0
]},
{"LETV":[
"y",
{"NUM":[
1
]},
{"LETV":[
"z",
{"NUM":[
1
]},
{"LETV":[
"k",
{"NUM":[
0
]},
{"LETV":[
"c",
{"NUM":[
0
]},
{"SEQ":[
{"READ":[
"k"
]},
{"WHILE":[
{"EQUAL":[
{"VAR":[
"c"
]},
{"NUM":[
0
]}
]},
{"IF":[
{"LESS":[
{"VAR":[
"z"
]},
{"VAR":[
"k"
]}
]},
{"SEQ":[
{"SEQ":[
{"SEQ":[
{"WRITE":[
{"VAR":[
"z"
]}
]},
{"ASSIGN":[
"x",
{"VAR":[
"y"
]}
]}
]},
{"ASSIGN":[
"y",
{"VAR":[
"z"
]}
]}
]},
{"ASSIGN":[
"z",
{"ADD":[
{"VAR":[
"x"
]},
{"VAR":[
"y"
]}
]}
]}
]},
{"ASSIGN":[
"c",
{"NUM":[
1
]}
]}
]}
]}
]}
]}
]}
]}
]}
]}
result = eval_exp({}, exp);
$("body").text("answer is: " + result);
</script>
</body>
</html>