Printing a star pattern in swift using stride function - swift

Question

Right now i am trying to print following star pattern using swift 4.
1
12
123
1234
For this i have taken below approach.
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")
}
But right now this will print below output.
*
1*
12*
123*
Any way to fix this issue ?

Answer 1

Here are some logical pattern in 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

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

Answer 3

1) Pyramid
*
* *
* * *
* * * *
* * * * *
LINK :-
https://replit.com/#vishakhaagarwa1/DarkorchidSmoothPayware#main.swift
for i in 1...5
{
for _ in stride(from: 5, to: i, by: -1)
{
print(terminator : " ")
}
for _ in 1...i
{
print("*",terminator : " ")
}
print(" ")
}
2) Right Triangle
*
* *
* * *
* * * *
* * * * *
LINK :-
https://replit.com/#vishakhaagarwa1/StingyOldApplicationstack#main.swift
var i = 1
var j = 1
for i in i...5
{
for _ in j...i
{
print("*",terminator : "")
}
print("")
}
3) Mirrored Right Triangle
*
* *
* * *
* * * *
* * * * *
LINK :-
https://replit.com/#vishakhaagarwa1/CookedParallelRobodoc#main.swift
for i in 1...5
{
for _ in stride (from: 5, to: i, by: -1)
{
print(" ",terminator : "")
}
for _ in 1...i
{
print("*",terminator : "")
}
print("")
}
4) Diamond
*
* * *
* * * * *
* * * * * * *
* * * * * * * * *
* * * * * * *
* * * * *
* * *
*
LINK :-
https://replit.com/#vishakhaagarwa1/WarmEmptyDegrees#main.swift
for i in 1...10
{
if i % 2 != 0
{
for _ in stride(from: 10, to: i, by: -1)
{
print(terminator : " ")
}
for _ in 1...i
{
print("*",terminator : " ")
}
print(" ")
}
}
for i in stride(from: 10, to: 1, by: -1)
{
if i % 2 != 0
{
for _ in stride(from: 10, to: i-1, by: -1)
{
print(terminator : " ")
}
for _ in stride(from: 2, to: i, by: 1)
{
print("*",terminator : " ")
}
print(" ")
}
}
5) Downward Triangle
* * * * *
* * * *
* * *
* *
*
LINK :-
https://replit.com/#vishakhaagarwa1/FearlessIndolentByte#main.swift
for i in 1...5
{
for _ in stride(from: i, to: 6, by: 1)
{
print("*",terminator : "")
}
print("")
}
6) Right Pascal’s Triangle
*
* *
* * *
* * * *
* * * * *
* * * *
* * *
* *
*
LINK :-
https://replit.com/#vishakhaagarwa1/IndianredNervousPrinter#main.swift
for i in 1...5
{
for _ in 1...i
{
print("*",terminator : "")
}
print("")
}
for i in 1...4
{
for _ in stride (from: 5, to: i, by: -1)
{
print("*",terminator : "")
}
print("")
}
7) Sandglass Pattern
* * * * *
* * * *
* * *
* *
*
*
* *
* * *
* * * *
* * * * *
LINK :-
https://replit.com/#vishakhaagarwa1/TangibleDeeppinkWatch#main.swift
for i in 1...5
{
for _ in 1...i
{
print(terminator: " ")
}
for _ in stride(from: i, to: 6, by: 1)
{
print("*",terminator : " ")
}
print("")
}
for i in 1...5
{
for _ in stride(from: 6, to: i, by: -1)
{
print(terminator : " ")
}
for _ in 1...i
{
print("*",terminator : " ")
}
print(" ")
}

Answer 4

for i in 0...5{
for _ in 0...i{
print("*", terminator: "")
}
print() }
for i in stride(from: 5, to: 0, by: -1){
for _ in stride(from: i, to: 0, by: -1){
print("*",terminator: "")
}
print() }
output :
*
**
***
****
*****
******
*****
****
***
**
*

Answer 5

var q : String = ""
repeat
{
print("***** Numerical Patterns *****")
print("1 for Number Right Triangle.. ")
print("2 for Sequential Number Right Triangle.. ")
print("3 for Pascal Number Triangle.. ")
print("Enter Your Choice :: ")
guard let index = Int(readLine()!), index > 0 && index < 4 else
{
print(" !!!! WArning :: Wrong Selection.......")
print("\n")
continue
}
var n: Int
print("Enter N Number For Pattern :: ")
let num = readLine()
if let t2 = Int(num!)
{
n = t2
}
else
{
print("wrong input ! taking default [5]")
n = 5
}
switch index {
case 1 :
for i in 1...n
{
for j in 1...i
{
print(j,terminator: " ")
}
print("")
}
case 2 :
var j = 0
for i in 1...n
{
for _ in 1...i
{
j = j+1
print(j,terminator: " ")
}
print("")
}
case 3 :
for i in 1...n
{
//print("i==",i)
for _ in stride(from: n, to: i, by: -1)
{
//print("k==",k)
print(terminator : " ")
}
var no = 1
for j in 1...i
{
//print("j==",j)
print(no,terminator : " ")
no = no * (i - j) / (j)
}
print(" ")
}
default :
print( "Wrong Input............")
}
print("\n")
print("Do you want to continues [PRESS Y/y] OR CLOSE [PRESS N/n] :: ")
q = (readLine()!)
print("\n")
}while(q == "y" || q == "Y")

Answer 6

func starprint(_ int : Int)
{
for i in 1...int
{
print(String.init(repeating: " ", count: int-i)+String.init(repeating: "*", count: i))
}
}
starprint(6)

Answer 7

for i in stride(from: 1, to: 6, by: 1) {
// prints from 1 to 4
for j in stride(from: 1, to: i, by: 1) {
print(j, separator: "", terminator: "")
}
print("")
}

Answer 8

You can use for loop with below sequencing.
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
func printLadderNumber(_ n: Int) {
for i in 1...n {
for j in 1...i {
print(j, terminator: "")
}
print("", terminator: "\n")// Helps for printing new line
}
}
printLadderNumber(4)
You can find various Star Patterns Question here
https://janeshswift.com/ios/dsa/array/how-to-print-patterns-in-swift/

Answer 9

1. Pyramid
1
1 2
1 2 3
1 2 3 4
for i in 1...4{
for _ in 1...5-i{
print(terminator:" ")
}
for j in 1...i{
print(j,terminator:" ")
}
print("")
}
2. Inverted Pyramid
1 2 3 4
1 2 3
1 2
1
for i in 1...4{
for _ in 1...i{
print(terminator:" ")
}
for j in 1...5-i{
print(j,terminator:" ")
}
print("")
}