The task is to check whether the number evaluates to infinity or not with the help of JavaScript. Here are a few techniques discussed.
Approach 1: Checking if the number is equal to the Number.POSITIVE_INFINITY or Number.NEGATIVE_INFINITY .
Example: This example uses the approach discussed above.
html
<body style="text-align:center;"> id="body"> <h1 style="color:green;" id="h1"> GeeksForGeeks </h1> <h3> Check if number is Infinity? </h3> <p id="GFG_UP" style="font-size: 15px; font-weight: bold;"> </p> <button onclick="GFG_Fun()"> click here </button> <p id="GFG_DOWN" style="color:green; font-size: 20px; font-weight: bold;"> </p> <script> var up=document.getElementById('GFG_UP'); var down=document.getElementById('GFG_DOWN'); var n=1/0; up.innerHTML="Click on the button to check if"+ " Number evaluates to Infinity.<br> Number = 1/0"; function GFG_Fun() { if(n==Number.POSITIVE_INFINITY||n==Number.NEGATIVE_INFINITY) { down.innerHTML="Infinity"; } else { down.innerHTML="Not Infinity"; } } </script> </body> |
Output:
Approach 2: Using Number.isFinite() method to check if the number is finite or not.
Example: This example uses the approach discussed above.
html
<body style="text-align:center;"> <h1 style="color:green;"> GeeksForGeeks </h1> <h3> Check if number is Infinity? </h3> <p id="GFG_UP" style="font-size: 15px; font-weight: bold;"> </p> <button onclick="GFG_Fun()"> click here </button> <p id="GFG_DOWN" style="color:green; font-size: 20px; font-weight: bold;"> </p> <script> var up=document.getElementById('GFG_UP'); var down=document.getElementById('GFG_DOWN'); var n=1/4; up.innerHTML="Click on the button to check if"+ " Number evaluates to Infinity.<br> Number = 1/4"; function GFG_Fun() { if(!Number.isFinite(n)) { down.innerHTML="Infinity"; } else { down.innerHTML="Not Infinity"; } } </script> </body> |
Output:
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