Can anyone please tell me how it's output is correct!! This is a js project this will count points of every level but how !

Question

function main() {
//take the number of passed levels
var levels = parseInt(readLine(),10);
var points = new Array();

var count = 0;
while(count<levels){
var elem = parseInt(readLine(),10);
points[count] = elem;
count++;
}

var sum = 0;
var i = 0;
while(i < levels){
sum += points[i]
i++;
}
console.log(sum);
}

Answer 1

If input is :
Ex:
3 // (levels)
20 // points[0]
30 //points[1]
40 //points[2]

var sum = 0;
var i = 0;
while(i < levels){ //0<3 is true
sum += points[i] //sum+=20=>0+20=>sum=20
i++; //I=1

In next iteration:
1<3 is true,
sum+=points[1] => sum= 20+30=>sum=50
I++;//I=2

In next iteration:
2<3 is true,
sum+=points[2] => sum= 50+40=>sum=90
I++ //I=3

3<3 is false so here loop stops..
}
console.log(sum); //this will output : 90

Answer 2

Thankyou bro 😊

Answer 3

My difficulty is after variable i can you explain me how this code will sum all the scores

Answer 4

levels input is how many scores do you need to read as input!

Your first while loop is reading scores into points array.

Your second while loop calculates sum of array elements which are scores at each level..
Ex:
3 // levels

20
30
40

20+30+40=90 is the sum

where is your difficulty in understanding code ?
tell that specific part, if still not clear.