task3.js

const calcTemp = ()=>{
    const numberTemp = document.getElementById('temp').value;
    //recieve the type of entered value
    const givenScale = document.getElementById('givenscale').value;
    console.log("Entered temperature : ",numberTemp,givenScale);
    
    // receive the type of value user wants to convert to
    const tempSelected  = document.getElementById('tempscale').value;

    let result = 'To be determined...';

    if(givenScale === 'Choose scale') alert('Please enter the scale for the entered value😶');
    if(tempSelected === 'Choose scale') alert('It seems you forgot to select the scale to convert😕');

    if(givenScale === tempSelected && givenScale !== 'Choose scale'){
        result = numberTemp + tempSelected;
    }

    //kelvin and celcius
    else if(givenScale==='°C' && tempSelected==='K'){
        result = (parseFloat(numberTemp) + 273.15) + ' K';
    }
    else if(givenScale==='K' && tempSelected==='°C'){
        result = (parseFloat(numberTemp) - 273.15) + ' °C';
    }

    //celcius and fahrenheit
    else if(givenScale==='°C' && tempSelected==='°F'){
        result = (9*parseFloat(numberTemp)/5.0 + 32.0 ) + ' °F';
    }
    else if(givenScale==='°F' && tempSelected==='°C'){
        result = ((parseFloat(numberTemp) - 32.0)*5/9.0 ) + ' °C';
    }
    //kelvin and fahrenheit
    else if(givenScale==='K' && tempSelected==='°F'){
        result = (9*(parseFloat(numberTemp) - 273.15)/5.0 + 32.0 ) + ' °F';
    }
    else if(givenScale==='°F' && tempSelected==='K'){
        result = ((parseFloat(numberTemp) - 32.0)*5/9.0 + 273.15) + ' K';
    }

    // print result in innerHTML
    console.log("Converted temperature : ",result);
    document.getElementById('resultContainer').innerHTML = result;
}