var weightkg=document.getElementById('weight').value;
var heightinm=document.getElementById('height').value;
function bmival (weightkg,heightinm){
var hout=heightinm*2
var output=weightkg/hout
//make a full number
// var r= Math.trunc(o)
if (output<=18.5){
return document.getElementById('print').innerHTML=`Your BMI is ${output} you are underweight` ;
}
else if(output>18.5 && o<25.5){
return document.getElementById('print').innerHTML=`Your BMI is ${output} You come under fit catogery`;
}
else{
return document.getElementById('print').innerHTML=`Your BMI is ${output} you are overweight and obese`;
}
}
[i am making a bmi cal that take input from user but i am getting a error and don't know what i am doing wrong]
** this is js code and when i run i get a NaN instead of Number **
The values from an input field are strings so you must convert them into numbers
var heightinm = +document.getElementById('height').value; // one way to do it.
The value you get from
var weightkg=document.getElementById('weight').value;
seems to be a string instead of number. You need to convert values to do Math operations on them. NaN tells you output is not a number. Turn your values to number with parseInt method.
var weightkg = parseInt(document.getElementById('weight').value);
or you can just put a "+" to convert a string into number
var weightkg = +document.getElementById('weight').value;
For Example.
const input = document.getElementById('input');
const defaultStringInput = document.getElementById('input').value;
const inputConverted = parseInt(document.getElementById('input').value);
const inputConverted2 = +document.getElementById('input').value;
input.addEventListener('change', () => {
console.log(typeof defaultStringInput); // string
console.log(typeof inputConverted); // number
console.log(typeof inputConverted2); // number
});