Быстрая печать рисунка звезды с использованием функции шага

Question

Прямо сейчас я пытаюсь напечатать следующий образец звезды, используя swift 4.

1
12
123
1234

Для этого я выбрал следующий подход.

for i in stride(from: 1, to: 5, by: 1) {
   // prints from 1 to 4
    for j in stride(from: 1, to: i, by: 1) {
          print(j, separator: "", terminator: "")
    }
    print("*\n")
}

Но сейчас это будет напечатано нижеoutput.

*

1*

12*

123*

Есть ли способ решить эту проблему?

Answer 1

Вот некоторые логические схемы в swift 4 ,

    0
   01
  012
 0123
01234

for i in  0...4{

    for j in stride(from: 4, to: i, by: -1){
        print( terminator : " ")
    }
    for k in 0...i{
        print(k,terminator : "")
    }
    print(" ")
}

54321
5432
543
54
5

for i in stride(from: 0, to: 5, by: 1){

    for j in stride(from: 5, to: i, by: -1){
        print(j , terminator : "")
    }
    print(" ")

}
5
5 4
5 4 3
5 4 3 2
5 4 3 2 1


for i in stride(from: 5, to: 0, by: -1)
{

    for j in stride(from: 5, to: i-1, by: -1){

      print(j , terminator : "")
    }
    print(" ")
}
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

for i in stride(from: 5, to: 0, by: -1)
{
    for j in 1...i{
        print(j, terminator : "")
    }
    print(" ")
}
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15

var value = 0
for i in 1...5 {

    for j in 1...i{
        value = value + 1
        print(value,terminator : "")
    }
    print(" ")
}
1
2 1
3 2 1
4 3 2 1
5 4 3 2 1

for i in 1...5{

    for j in 1...i{

    print(i+1 - j , terminator : "")
    }
    print(" ")
}

for i in 1...5{
    for j in stride(from: i, to: 0, by: -1){
        print(j, terminator : "")
    }
    print(" ")
}
1
2 7
3 8 13
4 9 14 19
5 10 15 20 25

var value = 0
for i in 1...5{

    for j in 1...i{
        if j != 1{
            value = value + 5
        }
        else{
            value = i
        }
        print(value , terminator : " ")
    }
    print(" ")
}

for i in 1...5{
    var temp = i
    for j in 0...i{
        print(temp , terminator : " ")
        temp = temp + 5
    }
    print(" ")

}
1
1 2 1
1 2 3 2 1
1 2 3 4 3 2 1
1 2 3 4 5 4 3 2 1

var value = 1
for i in 1...5{

    for j in 1...i{
         print(j,terminator : "")
    }

        for k in 1..<i{
        print(i-k,terminator : "")
    }
print(" ")
}


1 2 3 4 5
 1 2 3 4
  1 2 3
   1 2
    1
for i in stride(from: 5, to: 0, by: -1){
    for k in stride(from: 5, to: i, by: -1) {
        print(terminator : " ")
    }
        for j in stride(from: 1, to: i+1, by: 1){
           print("*",terminator : " ")
    }


    print(" ")
}

1
1 1
1 2 1
1 3 3 1
1 4 6 4 1


for i in 1...5{
    for j in stride(from: 5, to: i, by: -1){
        print(i,terminator : "")
    }
    var temp = 1

    for k in 1...i{
        print(temp,terminator : "")
         temp = temp * (i - k) / (k);
    }
    print(" ")
}
    1
   1 2
  1 2 3
 1 2 3 4
1 2 3 4 5
 1 2 3 4
  1 2 3
   1 2
    1


for i in 1...5{
    for k in stride(from: 5, to: i, by: -1) {
        print(terminator : " ")
    }

    for j in 1...i{
        print(j,terminator : " ")
    }
    print(" ")
}
for i in stride(from: 5, to: 0, by: -1){
    for k in stride(from: 5, to: i-1, by: -1) {
        print(terminator : " ")
    }
        for j in stride(from: 1, to: i, by: 1){
           print(j,terminator : " ")
    }
  print(" ")
}
12345
2345
345
45
5
5
45
345
2345
12345


for i in 1...5{

    for j in stride(from: i, to: 6, by: 1){
        print(j , terminator : "")
    }

    print(" ")
}
for i in stride(from: 5, to: 0, by: -1)
{

    for j in stride(from: i, to: 6, by: 1){
        print(j,terminator : "")
    }
    print(" ")
}



1 2 3 4 5
 2 3 4 5
  3 4 5
   4 5
    5
 for i in 1...5{
    for k in 0...i{
        print(terminator : " ")
    }
    for j in stride(from: i, to: 6, by: 1){
        print(j , terminator : " ")
    }

    print(" ")
}


12345
 2345
  345
   45
    5
    5
   45
  345
 2345
12345


for i in 1...5{
    for k in 1...i{
        print(terminator : " ")
    }
    for j in stride(from: i, to: 6, by: 1){
        print(j , terminator : "")
    }

    print(" ")
}
for i in stride(from: 5, to: 0, by: -1)
{
    for k in 1...i{
        print(terminator : " ")
    }
    for j in stride(from: i, to: 6, by: 1){
        print(j,terminator : "")
    }
    print(" ")
}
1 2 3 4 5
 2 3 4 5
  3 4 5
   4 5
    5
    5
   4 5
  3 4 5
 2 3 4 5
1 2 3 4 5
for i in 1...5{
    for k in 0...i{
        print(terminator : " ")
    }
    for j in stride(from: i, to: 6, by: 1){
        print(j , terminator : " ")
    }

    print(" ")
}

for i in stride(from: 6, to: 1, by: -1){
    for k in 1...i{
        print(terminator : " ")
    }
    for j in stride(from: i-1, to: 6, by: 1){
        print(j , terminator : " ")
    }

    print(" ")
}
1
1 0
1 0 1
1 0 1 0
1 0 1 0 1

for i in 0...4{
    for j in 0...i{
        if j % 2 == 0{
        print(1,terminator : " ")
        }
        else{
            print(0,terminator : " ")
        }
    }
    print(" ")

    }

1 0 0 0 0
0 2 0 0 0
0 0 3 0 0
0 0 0 4 0
0 0 0 0 5


for i in 1...5{
    for j in 1...5{

        if j == i{
            print(j,terminator : " ")
        }
        else{
            print(0,terminator : " ")
        }

    }
    print(" ")
}

Answer 2

Если хочешь

1
12
123
1234

for i in 1..<5 { // or for i in stride(from: 1, to: 5, by: 1) {
    for j in 1...i { // for j in stride(from: 1, through: i, by: 1) {
        print(j, terminator: "")
    }
    print("")
}

Если хочешь

*
**
***
****

for i in 1..<5 {
    for _ in 1...i {
        print("*", terminator: "")
    }
    print("")
}