code
'use strict'
let sum = 0;
let userInput;
let count = 0;
let maxValue = Number.MIN_VALUE;
while(userInput !== null){
userInput = prompt('Dear sir, would you pleaser enter a numer?');
if(userInput === null){
break;
}
if(Number.isNaN(Number(userInput)) || userInput === ''){
alert('I must disagrre, this is not a number.');
}else{
sum += Number(userInput);
count++;
if(maxValue <= Number(userInput)){
maxValue = Number(userInput);
}
}
}
alert(`The sum is ${sum} number of iterations is ${count} the max value is ${maxValue}`);