javascript calculate average based on user input array

Question

javascript calculate average based on user input array

There is a problem that I am trying to solve, but as a beginner it seems quite challenging. Here is the code I have written so far, however, when I run it only one window appears. Any advice or guidance would be greatly appreciated.

var years = prompt("Enter the number of years: "); // Number of years
var rainFall = new ArrayList();

while (years < 1) {

    alert("Invalid. Enter 1 or greater: ");
    years = prompt("Enter a year: ");
}

for (var y = 1; y <= years; y++) {

    for (var m = 1; m <= NUM_MONTHS; m++) {

        alert("Year " + y + ", month " + m + ": ");
        monthRain = prompt("Enter rainfall for a month ");
        rainfall.add(monthRain);
    }
}

alert("\nNumber of months: " + (years * NUM_MONTHS) + "Total rainfall: " + calculateTotalRainfall(rainfall) + " inches" + "Average monthly rainfall: " + calculateAverageRainfall(rainfall) + " inches");

javascript arrays

Answer 1

Answer №1

    Array.prototype.sum = function() {
      var total = 0;
      for(var i in this) {
        var i = parseFloat(this[i]);
        if(i>=0) {
          total += i;
        }
      }
      return total;
    };

    Array.prototype.avg = function() {
      var avg = (this.length>0)? parseFloat(this.sum()/this.length) : 0;
      avg = parseFloat(parseInt(avg*100)/100);
      return avg;
    };

    var years = parseInt(prompt("Enter the number of years: ")); // Number of years

    var rainFall = [];

    while (years < 1) {
      alert("Invalid. Enter 1 or greater: ");
      years = parseInt(prompt("Enter a year: "));
    }

    var NUM_MONTHS = 12;
    for (var y = 1; y <= years; y++) {
      for (var m = 1; m <= NUM_MONTHS; m++) {
        alert("Year " + y + " month " + m + ": ");

        var monthRain = parseFloat(prompt("enter rainfall for a month "));
        if(monthRain>=0) {
          rainFall.push(monthRain);
        }
      }
    }

 if(years<1) years = 0;
 alert("\nNumber of months: " + (years * NUM_MONTHS) + "   Total rainfall: " + rainFall.sum() + " inches" + "   Average monthly rainfall: " + rainFall.avg() + " inches");

OR:

    function sumArray (items) {
      var total = 0;
      for(var i in items) {
        var i = parseFloat(items[i]);
        if(i>=0) {
          total += i;
        }
      }
      return total;
    };

    function avgArray(items) {
      var sum = sumArray(items);
      var avg = (items.length>0)? parseFloat(sum/items.length) : 0;
      avg = parseFloat(parseInt(avg*100)/100);
      return avg;
    };

    var years = parseInt(prompt("Enter the number of years: ")); // Number of years

    var rainFall = [];

    while (years < 1) {
      alert("Invalid. Enter 1 or greater: ");
      years = parseInt(prompt("Enter a year: "));
    }

    var NUM_MONTHS = 12;
    for (var y = 1; y <= years; y++) {
      for (var m = 1; m <= NUM_MONTHS; m++) {
        alert("Year " + y + " month " + m + ": ");

        var monthRain = parseFloat(prompt("enter rainfall for a month "));
        if(monthRain>=0) {
          rainFall.push(monthRain);
        }
      }
    }

 if(years<1) years = 0;
 alert("\nNumber of months: " + (years * NUM_MONTHS) + "   Total rainfall: " + sumArray(rainFall) + " inches" + "   Average monthly rainfall: " + avgArray(rainFall) + " inches");

Answer 2

    Array.prototype.sum = function() {
      var total = 0;
      for(var i in this) {
        var i = parseFloat(this[i]);
        if(i>=0) {
          total += i;
        }
      }
      return total;
    };

    Array.prototype.avg = function() {
      var avg = (this.length>0)? parseFloat(this.sum()/this.length) : 0;
      avg = parseFloat(parseInt(avg*100)/100);
      return avg;
    };

    var years = parseInt(prompt("Enter the number of years: ")); // Number of years

    var rainFall = [];

    while (years < 1) {
      alert("Invalid. Enter 1 or greater: ");
      years = parseInt(prompt("Enter a year: "));
    }

    var NUM_MONTHS = 12;
    for (var y = 1; y <= years; y++) {
      for (var m = 1; m <= NUM_MONTHS; m++) {
        alert("Year " + y + " month " + m + ": ");

        var monthRain = parseFloat(prompt("enter rainfall for a month "));
        if(monthRain>=0) {
          rainFall.push(monthRain);
        }
      }
    }

 if(years<1) years = 0;
 alert("\nNumber of months: " + (years * NUM_MONTHS) + "   Total rainfall: " + rainFall.sum() + " inches" + "   Average monthly rainfall: " + rainFall.avg() + " inches");

OR:

    function sumArray (items) {
      var total = 0;
      for(var i in items) {
        var i = parseFloat(items[i]);
        if(i>=0) {
          total += i;
        }
      }
      return total;
    };

    function avgArray(items) {
      var sum = sumArray(items);
      var avg = (items.length>0)? parseFloat(sum/items.length) : 0;
      avg = parseFloat(parseInt(avg*100)/100);
      return avg;
    };

    var years = parseInt(prompt("Enter the number of years: ")); // Number of years

    var rainFall = [];

    while (years < 1) {
      alert("Invalid. Enter 1 or greater: ");
      years = parseInt(prompt("Enter a year: "));
    }

    var NUM_MONTHS = 12;
    for (var y = 1; y <= years; y++) {
      for (var m = 1; m <= NUM_MONTHS; m++) {
        alert("Year " + y + " month " + m + ": ");

        var monthRain = parseFloat(prompt("enter rainfall for a month "));
        if(monthRain>=0) {
          rainFall.push(monthRain);
        }
      }
    }

 if(years<1) years = 0;
 alert("\nNumber of months: " + (years * NUM_MONTHS) + "   Total rainfall: " + sumArray(rainFall) + " inches" + "   Average monthly rainfall: " + avgArray(rainFall) + " inches");

Answer 3

Answer №2

Consider replacing rainfall.add(monthRain); with rainfall.push(monthRain);

Answer 4

Consider replacing rainfall.add(monthRain); with rainfall.push(monthRain);

Answer 5

Answer №3

It appears that the main issue was the utilization of the Java ArrayList class instead of the JavaScript Array class. Remember, Java and JavaScript are two distinct languages despite their confusingly similar names.

To resolve this, simply switch from using new ArrayList() to new Array(), and change rainfall.add to rainFall.push (be mindful of the change in capitalization as well).

If you have a JavaScript console inspector available (such as the one found in Chrome by pressing ctrl-shift-J), you can identify any JS errors occurring in your code, such as when ArrayList could not be located.

I've made the necessary corrections below and included the absent NUM_MONTHS constant (which I presume was defined elsewhere).

var NUM_MONTHS = 12;
var years= prompt("Enter the number of years: "); // Number of years

// CORRECTION: use "Array" instead of "ArrayList". Alternatively, you can also use "var rainFall = [];", which is another approach I prefer
var rainFall = new Array();

while (years < 1) {
    alert("Invalid. Enter 1 or greater: ");
    years =prompt("Enter a year: ");
}

for (var y = 1; y <= years; y++) {
    for (var m = 1; m <= NUM_MONTHS; m++) {
        alert("Year " + y + " month " + m + ": ");
        monthRain = prompt("enter rainfall for a month ");
        
        // CORRECTION: utilize the "push()" method of Array and maintain camelCase consistency for variable names
        rainFall.push(monthRain);
    }
}

alert("\nNumber of months: " + (years * NUM_MONTHS) + "Total rainfall: " + calculateTotalRainFall(rainFall) + " inches" + "Average monthly rainfall: " + calculateAverageRainFall(rainFall) + " inches");

Answer 6

It appears that the main issue was the utilization of the Java ArrayList class instead of the JavaScript Array class. Remember, Java and JavaScript are two distinct languages despite their confusingly similar names.

To resolve this, simply switch from using new ArrayList() to new Array(), and change rainfall.add to rainFall.push (be mindful of the change in capitalization as well).

If you have a JavaScript console inspector available (such as the one found in Chrome by pressing ctrl-shift-J), you can identify any JS errors occurring in your code, such as when ArrayList could not be located.

I've made the necessary corrections below and included the absent NUM_MONTHS constant (which I presume was defined elsewhere).

var NUM_MONTHS = 12;
var years= prompt("Enter the number of years: "); // Number of years

// CORRECTION: use "Array" instead of "ArrayList". Alternatively, you can also use "var rainFall = [];", which is another approach I prefer
var rainFall = new Array();

while (years < 1) {
    alert("Invalid. Enter 1 or greater: ");
    years =prompt("Enter a year: ");
}

for (var y = 1; y <= years; y++) {
    for (var m = 1; m <= NUM_MONTHS; m++) {
        alert("Year " + y + " month " + m + ": ");
        monthRain = prompt("enter rainfall for a month ");
        
        // CORRECTION: utilize the "push()" method of Array and maintain camelCase consistency for variable names
        rainFall.push(monthRain);
    }
}

alert("\nNumber of months: " + (years * NUM_MONTHS) + "Total rainfall: " + calculateTotalRainFall(rainFall) + " inches" + "Average monthly rainfall: " + calculateAverageRainFall(rainFall) + " inches");

javascript calculate average based on user input array

Answer №1

Answer №2

Answer №3

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