How do I use parseFloat in this algorithm?

Question

I created an algorithm that gets a 4-quarter note , which makes an average calculation and shows the result of the approval. For the result of the approval I did as follows .

Result of Approval :

Pass with maximum grade = 10 . Above average approval = 8 to 9 . Approval on average = 7 . Recovery = 6 . Failure = 1 to 5 .

Problem = If the user enters the value 7 in each note the average will be 7 and will show " Pass on average = 7 " However, if you insert the value of 7.3 in each note will show the following message " Failed " in case it was to show " Pass above average ".

Obs ( I know I have to transform something for Parsefloat but I’m not sure where to insert it . )

var s1 = prompt ( " Insira a nota do 1 Bimestre : ") ; 
var s2 = prompt ( " Insira a nota do 2 Bimestre : " ) ; 
var s3 = prompt ( " Insira a nota do 3 Bimestre : " ) ; 
var s4 = prompt ( " Insira a nota do 4 Bimestre : " ) ;


var s1 = Number (s1) ; 
var s2 = Number (s2) ; 
var s3 = Number (s3) ; 
var s4 = Number (s4) ; 

var media = parseFloat (( s1 + s2 + s3 + s4 ) / 4 ); 

if (media ==10)
{
	alert ( "Aprovação com nota maxima! " ) ; 
}  

else if ((media == 8) || ( media == 9 ) )
{
	alert ( " Aprovação acima da  média ! " ) ; 
} 

else if (media == 7) 
{
	alert ( " Aprovação com nota na média! " ) ; 
}

else if ( media == 6 ) 
{
	alert ( "Recuperação ! " ) ; 
}

else 
{
	alert ( " Reprovado ! " ) ; 
}

Answer 1

The problem is that in your ifs you are not covering the values between the notes (such as 7.3). Modifying the checks to the following code your logic should meet the expected:

if (media ==10) {
  alert ( "Aprovação com nota maxima! " ) ;
} else if ( media > 7) {
  alert ( " Aprovação acima da  média ! " ) ;
} else if (media == 7) {
  alert ( " Aprovação com nota na média! " ) ;
} else if ( media == 6 ) {
  alert ( "Recuperação ! " ) ;
} else {
  alert ( " Reprovado ! " ) ;
}

Answer 2

It shall remain so for the operation, the parseFloat goes directly into the variable:

var s1 = prompt("Insira a nota do 1 Bimestre: "); 
var s2 = prompt("Insira a nota do 2 Bimestre: "); 
var s3 = prompt("Insira a nota do 3 Bimestre: "); 
var s4 = prompt("Insira a nota do 4 Bimestre: ");

var s1 = parseFloat(s1); 
var s2 = parseFloat(s2); 
var s3 = parseFloat(s3); 
var s4 = parseFloat(s4); 

var media = (( s1 + s2 + s3 + s4 ) / 4 );

if(media == 10){

  	alert("Aprovação com nota maxima!");

}else if (media > 7) {

  	alert("Aprovação acima da média !");

} else if(media == 7) {

  	alert(" Aprovação com nota na média!");

} else if( media == 6 ) {

  	alert("Recuperação!");

} else{

  	alert("Reprovado!");

}