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var n;
var arr;
var s = 0;
do
{
write("Enter arr length: ");
n = read();
}
while (n<=0 || isNaN(n));
arr = array(n);
for (var i=0; i<arr.length; i++)
write("Enter arr[" + i + "]: ");
arr[i] = read();
s = s + arr[i];
write("The sum of all elements is " + s);