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/**
 * Question 1
 **/
 function sumNumbers(a, b) {
    var sum = a + b;
    return sum;
 }

/**
 * Question 2
 **/
 function productNumbers(a, b) {
    var sum = a * b;
    return sum;
 }

/**
 * Question 3
 **/
 function sumRangeNumbers(lowest, highest) {
    var sum = 0;
    for(var i = lowest+1; i < highest; i++) {
        sum += i;
    }
    return sum;
 }

/**
 * Question 4
 **/
 function stringPhrase(name) {
    var phrase = "Hi " + name + ", how are you?";
    return phrase;
 }

/**
 * Question 5
 **/
 function stringResponse(question) {
    var response = "Try again";

    if(question === "How are you?") {
        response = "I am fine";
    }
    return response;
 }

/**
 * Question 6
 **/
 function checkIfHigher(a, b) {
    var isHigher = false;

    if(a > b) {
        isHigher = true;
    }
    return isHigher;
 }

/**
 * Question 7
 **/
 function printRange(a, b) {
    var result = "";
    var i = 0;

    if(a < b) {
        for(i = a; i < b+1; i++) {
            result += i + ",";
        }
    }
    else if(a > b) {
        for(i = a; i > b-1; i--) {
            result += i + ",";
        }
    }
    else {
        result = a;
    }

    return result;
 }

/**
 * Question 8
 **/
 function stringRepeat(text, number) {
    var result = '';

    for(var i = 0; i < number; i++) {
        result += text + ",";
    }
    return result;
 }

/**
 * Question 9
 **/
 function calculateInterest(money, years, interest) {
    var result = money, currentInterest = 0;

    for(var i = 0; i < years; i++) {
        currentInterest = (result / 100) * interest;
        result += currentInterest; 
    }
    return result;
 }

/**
 * Question 10
 **/
 function countNumbers(a, b) {
    var counter = 0;

    if(a < b) {
        for(var i = a+1; i < b; i++) {
            counter++;
        }
    }
    else if(a > b) {
        for(var i = a; a > b+1; a--) {
            counter++;
        }
    }
    return counter;
 }

/**
 * Question 11
 **/
 function inRange(value) {
    var isInRange = false;

    if(value > 10 && value < 20) {
        isInRange = true;
    }
    return isInRange;
 }

/**
 * Question 12
 **/
 function fizzBuzz(start, stop) {
    var result = '';

    if(stop <= start) {
        result = 'Stop is lower than start or they are the same. Try again!';
    }
    else {
        for(var i = start; i < stop+1; i++) {
            if(i % 3 === 0 && i % 5 !== 0) {
                result += 'Fizz, ';
            }
            else if(i % 5 === 0 && i % 3 !== 0) {
                result += 'Buzz, ';
            }
            else if(i % 3 === 0 && i % 5 === 0) {
                result += 'Fizz Buzz, '
            }
            else {
                result += i + ', ';
            }
        }
    }
    return result;
 }