"function"
Bootstrap 4.0.0 Snippet by lavan

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <!DOCTYPE html> <html> <body> <input type="text" id="fst"> <input type="text" id="sec"> <input type="text" id="thr"> <button type="button" onclick="fun()">Frst click</button> <input type="text" id="1"> <input type="text" id="2"> <input type="text" id="3"> <button type="button" onclick="fun2()">Sec Click</button> <p id="demo"></p> <p id="demo1"></p> <script> function fun(){ var one=document.getElementById('fst').value var two=document.getElementById('sec').value var three=document.getElementById('thr').value document.getElementById('demo'). innerHTML=cal(one,two,three); } function fun2(){ var one=document.getElementById('1').value var two=document.getElementById('2').value var three=document.getElementById('3').value document.getElementById('demo1'). innerHTML=cal(one,two,'','sdsd'); } function cal(one,sec,typ,other){ if(typ=='+'){ return Number(one)+Number(sec); } else if(typ=='-'){ return Number(one)-Number(sec); } else { return 'no matched'+other } } </script> </body> </html>

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