Exercises: for loops

The even/odd reporter

Write a for loop that will iterate from 0 to 20. For each iteration, it will check if the current number is even or odd, and report that to the screen (e.g. "2 is even").

See Solution

for (var i = 0; i <= 20; i++) {
    if (i % 2 === 0) {
        console.log(i + ' is even');
    } else {
        console.log(i + ' is odd');
    }
}

Multiplication Tables

Write a for loop that will iterate from 0 to 10. For each iteration of the for loop, it will multiply the number by 9 and log the result (e.g. "2 * 9 = 18").

Bonus: Use a nested for loop to show the tables for every multiplier from 1 to 10 (100 results total).

See Solution

// Multiplication tables
var multiplier = 9;
for (var i = 0; i <= 10; i++) {
    var result = multiplier * i;
    console.log(multiplier + ' * ' + i + ' = ' + result);
}


for (var multiplier = 0; multiplier <= 10; multiplier++) {
 for (var i = 0; i <= 10; i++) {
   var result = multiplier * i;
   console.log(multiplier + ' * ' + i + ' = ' + result);
 }
}

The Grade Assigner

Check the results of your assignGrade function from the conditionals exercise by logging every value from 60 to 100: your log should show "For 88, you got a B. For 89, you got a B. For 90, you got an A. For 91, you got an A.", etc., logging each grade point in the range.

See Solution

function assignGrade(score) {
    if (score > 90) {
        return 'A';
    } else if (score > 80) {
        return 'B';
    } else if (score > 70) {
        return 'C';
    } else if (score > 65) {
        return 'D';
    } else {
        return 'F';
    }
}

for (var i = 80; i <= 100; i++) {
  console.log('For ' + i + ', you got a ' + assignGrade(i));
}