# Day 3 - Operators
 

## [Exercise:Solutions](#exercise-solutions)

- ### [Exercise:Level 1](#exercise-level-1)
- ### [Exercise:Level 2](#exercise-level-2)
- ### [Exercise:Level 3](#exercise-level-3) <hr>

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# Exercise Solutions

## Exercise Level 1

1. Declare firstName, lastName, country, city, age, isMarried, year variable and assign value to it and use the typeof operator to check different data types.

```js
let name = "nevzat"
let lastName = "atalay"
let country = "turkey"
let city = "bitlis"
let age = 25
let isMarried = true

console.log(typeof(name),typeof(lastName),typeof(country),typeof(city),typeof(age),typeof(isMarried))
```

2. Check if type of '10' is equal to 10

```js
let number ="10"
console.log(number==10)
```

3. Check if parseInt('9.8') is equal to 10

```js
let number = parseInt(9.8)
console.log(number==10)
```

4. Boolean value is either true or false.
 - Write three JavaScript statement which provide truthy value.
 - Write three JavaScript statement which provide falsy value.

```js
console.log(!!"merhaba")
console.log(!!1)
console.log(!![])

console.log(!!"")
console.log(!!0)
console.log(!!null)
```

5. Figure out the result of the following comparison expression first without using console.log(). After you decide the result confirm it using console.log()

- 4 > 3
- 4 >= 3
- 4 < 3
- 4 <= 3
- 4 == 4
- 4 === 4
- 4 != 4
- 4 !== 4
- 4 != '4'
- 4 == '4'
- 4 === '4'
- Find the length of python and jargon and make a falsy comparison statement.

```js
const arr = [
    4 > 3,
    4 >= 3,
    4 < 3,
    4 <= 3,
    4 == 4,
    4 === 4,
    4 != 4,
    4 !== 4,
    4 != '4',
    4 == '4',
    4 === '4',
    ]
console.log(arr)

let string = "phyton", string1 = "jargon"
console.log(string.length >= string1.length )
```

6. Figure out the result of the following expressions first without using console.log(). After you decide the result confirm it by using console.log()

- 4 > 3 && 10 < 12
- 4 > 3 && 10 > 12
- 4 > 3 || 10 < 12
- 4 > 3 || 10 > 12
- !(4 > 3)
- !(4 < 3)
- !(false)
- !(4 > 3 && 10 < 12)
- !(4 > 3 && 10 > 12)
- !(4 === '4')
- There is no 'on' in both dragon and python


```js
const arr = [
    4 > 3 && 10 < 12,
    4 > 3 && 10 > 12,
    4 > 3 || 10 < 12,
    4 > 3 || 10 > 12,
    !(4 > 3),
    !(4 < 3),
    !(false),
    !(4 > 3 && 10 < 12),
    !(4 > 3 && 10 > 12),
    !(4 === '4')]
    console.log(arr)

let string = "phyton", string1 = "jargon"
console.log(string.includes("on") && string1.includes("on"))
```

7. Use the Date object to do the following activities

- What is the year today?
- What is the month today as a number?
- What is the date today?
- What is the day today as a number?
- What is the hours now?
- What is the minutes now?
- Find out the numbers of seconds elapsed from January 1, 1970 to now.

```js
let now = new Date()

console.log(now.getFullYear())
console.log(now.getMonth()+1)
console.log(now.getDay())
console.log(now.getHours())
console.log(now.getMinutes())
console.log(now.getTime())
```

## Exercise Level 2

1. Write a script that prompt the user to enter base and height of the triangle and calculate an area of a triangle (area = 0.5 x b x h).

```
Enter base: 20
Enter height: 10
The area of the triangle is 100
```

```js
let width =Number(prompt("üçgenin genişligini giriniz"))
let height =Number(prompt("üçgenin yğksekliğini giriniz"))
let area = width*height / 2
console.log(area)
```
2. Write a script that prompt the user to enter side a, side b, and side c of the triangle and and calculate the perimeter of triangle (perimeter = a + b + c)
```
Enter side a: 5
Enter side b: 4
Enter side c: 3
The perimeter of the triangle is 12
```

```js
let width =Number(prompt("üçgenin a kenarını  giriniz"))
let height =Number(prompt("üçgenin yüksekliğini giriniz"))
let widthb = Number(prompt("üçgenin b kenarını giriniz"))
let perimeter = width+height+widthb
console.log(perimeter)
```


3. Get length and width using prompt and calculate an area of rectangle (area = length x width and the perimeter of rectangle (perimeter = 2 x (length + width))

```js
let width = Number(prompt("dikdörtgenin  genişliğini  giriniz"))
let height = Number(prompt("dikdörtgenin yüksekliğini giriniz"))
let perimeter = 2*(width+height) 
console.log(perimeter)
```


4. Get radius using prompt and calculate the area of a circle (area = pi x r x r) and circumference of a circle(c = 2 x pi x r) where pi = 3.14.

```js
let r = 5
let area = Math.PI  *  r**2
console.log(area)
```

5. Calculate the slope, x-intercept and y-intercept of y = 2x -2

```js
let slope = 2 //x in katsayısı egimi verir
let x_intercept = 1
let y_intercept = 2
console.log(`denklemin eğimi ${slope}, x in kesme noktası ${x_intercept}, y nin kesme noktası ${y_intercept} dir`)
```

6. Slope is m = (y2-y1)/(x2-x1). Find the slope between point (2, 2) and point(6,10)

```js
let x1 =2 , x2 = 6
let y1 = 2 ,y2 =10
let slope =( y2 - y1 ) / (x2 - x1)
console.log(slope)

```
7. Compare the slope of above two questions.

```js
let slope1 = 2
let slope2 = 2
console.log(slope1==slope2)
```

8. Calculate the value of y (y = x2 + 6x + 9). Try to use different x values and figure out at what x value y is 0.

```js
let y = (x + 3)**2
let x = [-3,-2,-1,0,1,2,3]
y nin 0 debuggeri için x -3tür
```

9. Writ a script that prompt a user to enter hours and rate per hour. Calculate pay of the person?

```
Enter hours: 40
Enter rate per hour: 28
Your weekly earning is 1120
```

```js
let hours = Number(prompt("günde kaç saat çalışıyorsunuz"))
let workingWage = Number(prompt("saatlik çalışma ücretinizi giriniz"))
let wage = hours*workingWage*30
console.log(`maaşınız ${wage} tl dir`)
```


10. If the length of your name is greater than 7 say, your name is long else say your name is short.

```js
let myName = "nevzat"
if(myName.length > 7){
    console.log("adınız uzundur")
}
else{
    console.log("adınız kıssadır")
}
```

11. Compare your first name length and your family name length and you should get this output.

```
let firstName = 'Asabeneh'
let lastName = 'Yetayeh'
```
```
Your first name, Asabeneh is longer than your family name, Yetayeh
```

```js
let myName = "nevzat"
let myLastName = "talay"
if(myName.length > myLastName.length){
 console.log(`adınız nevzat soyadınız atalaydan daha uzundur`)   
}
else{
    console.log("soyadınız atalay adınız nevzattan daha uzundur")
}
```

12. Declare two variables myAge and yourAge and assign them initial values and myAge and yourAge.

```
let myAge = 250
let yourAge = 25
```
```
I am 225 years older than you.
```

```js
let myAge =25
let yourAge =18
let message = myAge - yourAge > yourAge - myAge ? "ben senden büyüğüm" : "sen benden büyüksün"
console.log(message)
```


13. Using prompt get the year the user was born and if the user is 18 or above allow the user to drive if not tell the user to wait a certain amount of years.

```
Enter birth year: 1995
You are 25. You are old enough to drive

Enter birth year: 2005
You are 15. You will be allowed to drive after 3 years.
```

```js
let birtYear = Number(prompt("doğum yılınızı giriniz"))
let now = new Date()
let year = now.getFullYear()
let age = year - birtYear
if(age >=18){
    console.log("ehliyet sınavına başvuru yapabilirsiniz")
}
else{
    console.log(`ehliyet sınavına başvuru yapabilmeniz için ${18-age} yıl beklemeniz gerekmektedir`)
}
```

14. Write a script that prompt the user to enter number of years. Calculate the number of seconds a person can live. Assume some one lives just hundred years

```
Enter number of years you live: 100
You lived 3153600000 seconds.
```

```js
let age = Number(prompt("kaç yaşındasınız"))
let lastSecond = age*365*24*60*60
let remainingSeconds = (100*365*24*60*60) - (lastSecond)
console.log(`en fazla ${remainingSeconds} saniye ömrÜn kaldı WAKW UP`)
```


15. Create a human readable time format using the Date time object
```
- YYYY-MM-DD HH:mm
- DD-MM-YYYY HH:mm
- DD/MM/YYYY HH:mm
```
```js
let now = new Date()

let year = now.getFullYear()
let mount = now.getMonth()
let day = now.getDay()
let hours = now.getHours()
let minuts = now.getMinutes()

console.log(`${year}-${mount}-${day}           ${hours} : ${minuts}`)
console.log(`${day}-${mount}-${year}           ${hours} : ${minuts}`)
console.log(`${year} / ${mount} / ${day}       ${hours} : ${minuts}`)
```
## Exercise Level 3

1. Create a human readable time format using the Date time object. The hour and the minute should be all the time two digits(7 hours should be 07 and 5 minutes should be 05 )
```
- YYY-MM-DD HH:mm eg. 20120-01-02 07:05
```

```js
let now = new Date()

let year = now.getFullYear()
let mount = String(now.getMonth()+1).padStart(2,'0')
let day = String(now.getDate() ).padStart(2,'0')
let hour = String(now.getHours()).padStart(2,'0')
let minut = String(now.getMinutes()).padStart(2,'0')
console.log(`${day} / ${mount} / ${year} ${hour} : ${minut}`)

```

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