Numbers

Question 1

What are the possible simple arithmetic operation we can do with PHP?

Answer 1

$a + $b
$a - $b

$a * $b
$a / $b

$a % $b

Question 2

How do you do the assignment and operation at the same time?

Answer 2

para decir $a = $a + $b
$a += $b

Question 3

Which ones are the incremental operators?

Answer 3

$a++

++$a

Question 4

Which ones are the decrement operators?

Answer 4

$a–

–$a

Question 5

How do you convert a string into number?

Answer 5

if I have $strnum=’12’

floatval($strnum)

o

intval($strnum)

Question 6

Which ones are the most common number functions?

Answer 6

1. abs(-15)
2. paw(2,3)
3. sqrt(16)
4. max(2,3)
5. min(2,3)
6. round(2.6) => 3
   round(2.4) => 2
7. floor(2.6) => 6
8. ceil(2.4) => 3

Question 7

How do you get the absolute number?

Answer 7

abs(-15)

Question 8

How do you get a number elevated to another number?

Answer 8

pow(2,3)

=> me daria 8 porque es 222

Question 9

Como obtengo la raiz cuadrada de un número?

Answer 9

sqrt(16)

Question 10

How do I get the maximum number of a range of numbers?

Answer 10

max(2,3,4,5,6)

separo los numeros por coma

Question 11

How do i get the minimum number of a range of numbers?

Answer 11

min(2,3,4,5,6)

los separo por comas

Question 12

Como funciona el método round()?

Answer 12

si es < a .5 redondea para abajo, y si es >= .5 redondea para arriba.

Entonces

round(2.5) va a ser igual a 3
y
round(2.4) va a ser igual a 2

Question 13

How do I make it always to round down?

Answer 13

with floor()
floor(2.6) => 2

Question 14

How do I make it always round up?

Answer 14

with ceil()
ceil(2.4) => 3

Question 15

How can you change the format of a number?

Answer 15

number_format($number,number of decimals, ‘qué separa los decimales’, ‘qué separa los miles’)

$number=123456789,123
number_format($number,2, ‘,’,’ ‘)
=>
123 456 789,12