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Shariff Matola
2,764 PointsFor this challenge, we'd like to know in a range of values from 1 to 100, how many numbers are both odd, and a multiple
Can you help me out on this guys I'm stuck
var results = 20
for n in 1...100 { // Enter your code
//End code
}
var results: [Int] = [20]
for n in 1...100 {
// Enter your code below
// End code
}
9 Answers
Jonathan Ruiz
2,998 PointsThis will make you pass the challenge. I would take look at the videos again or restart some of the older parts of logical operators. Especially for foundational material like this.
var results: [Int] = []
for n in 1...100 {
if (n % 2 != 0) && (n % 7 == 0) {
results.append(n)
}
}
the logic I wrote earlier would still apply
Jonathan Ruiz
2,998 PointsHi Shariff for this challenge you have to get a number and append it to the results array if its odd and a multiple of 7. To check to see if a number is divisible you can use the modulo operator (%) and see if the remainder is 0. If the remainder is 0 then the two numbers are perfectly divisible.
let example = 25 % 5
// 5 divides into 25 perfectly 5 times so there is no remainder that means they're perfectly divisible
// to check if a number is a multiple of 7
let randomNumber = 49 % 7 == 0
You also check to see if a number is odd. For this one its the same idea using the modulo operator( % ) but you will use the logical operator not equal ( != ). This logical operator means not equal to.
let example = 25 % 2 != 0
//if you put this on a playground it will say true on the right hand side because 25 is an odd number.
Since these are the two parts of the if statement you write you must combine them with the and logical operator ( && ). If both conditions are true the code executes if even one is not true the code doesn't run.
if (49 % 7 == 0) && (25 % 2 != 0) {
}
lastly to append to the results array use dot notation and ( ) to append n to the results array.
```swift
let results: [Int] = [ ]
// we need to put :[Int] since its an empty array and the compiler needs to know the type since this is an empty array
example.append( )
hope this helps !
Shariff Matola
2,764 PointsThank you but I'm still having challenges on this
Jonathan Ruiz
2,998 PointsWhat part is confusing maybe I can explain it differently
Shariff Matola
2,764 PointsFor real this part its a beat difficult to me i have almost a week trying to work on it but its kinda trick
Shariff Matola
2,764 PointsAt least now i know where its going but im in a war with that
Shariff Matola
2,764 PointsCheers l see i was not using .append
Jonathan Ruiz
2,998 Pointsah I see yeah at the end they want you to append n to the empty array glad you passed it !
Shariff Matola
2,764 PointsYeah Jonathan thank you so much lemme try to work until i reach your level
Jonathan Ruiz
2,998 Pointshappy to help learning to code is just time and practice I don't know everything either