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Bootstrap 4.1.1 Snippet by lavan

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/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="one" placeholder="Type"> <input type="text" id="two" placeholder="Type"> <input type="text" id="three" placeholder="Type"> <button onclick="chk()">Sum</button> <p id="showof"></p> <script> function chk(){ cnd=document.getElementById('one').value cnd1=document.getElementById('two').value cnd2=document.getElementById('three').value lav(); } function lav(){ if(cnd2=='+'){ document.getElementById('showof').innerHTML=Number(cnd)+Number(cnd1) } else if(cnd2=='-'){ document.getElementById('showof').innerHTML=Number(cnd)-Number(cnd1) } else if (cnd2=='%'){ document.getElementById('showof').innerHTML=Number(cnd)/Number(cnd1) } else{ document.getElementById('showof').innerHTML="nothing selected" } } </script> </body> </html>

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