print "X" star patterns in Kotlin - kotlin

Question

can someone help me make star patterns like this using for loop in kotlin? i already try this but i think my code is too long. can someone help me?
x Star Pattern
fun fifthPyramid(){
for(i in 1..13){
if(i==1||i==13){
print("*")
}else
print(" ")
}
println("")
for(i in 1..13){
if(i==2||i==12){
print("*")
}else
print(" ")
}
println("")
for(i in 1..13){
if(i==3||i==11){
print("*")
}else
print(" ")
}
println("")
for(i in 1..13){
if(i==4||i==10){
print("*")
}else
print(" ")
}
println("")
for(i in 1..13){
if(i==5||i==9){
print("*")
}else
print(" ")
}
}

Answer 1

The star pattern consists of exactly N * 2 - 1 rows and columns. So the outer and inner loop will run till towards count = N * 2 - 1
fun main() {
var starCount = 5;
val count = starCount * 2 - 1;
for(i in 1..count){
for(j in 1..count){
if(j==i || (j==count - i + 1))
{
print("*");
}
else
{
print(" ");
}
}
println("")
}
}

Answer 2

Identify the pattern with respect to row and column. You put a * when the row and column are the same, or the row and inverse of the column are the same.
fun printX(size: Int, char: Char) {
repeat(size) { row ->
repeat(size) { col ->
print(if (row == col || row == (size - col - 1)) char else ' ')
}
println()
}
}
fun main() {
printX(7, '*')
}

Answer 3

You can write a fun that takes an Int and a Char as arguments and then use a loop in order to build each line and print it.
Basically like this:
fun printX(heightWidth: Int, symbol: Char) {
// iterate the heigth in order to build up each line (top->down)
for (i in 0 until heightWidth) {
/*
build up an array of Chars (representing a line)
with the desired size (length of a line)
filled up with whitespaces by default
*/
var line = CharArray(heightWidth) { ' ' }
// then replace whitespaces at the desired indexes by the symbol
line[i] = symbol // one from left to right
line[line.size - i - 1] = symbol // and one from right to left
// and print the result
println(line)
}
}
You can throw an Exception in case of negative heightWidth values because they will cause trouble if you don't. And maybe forbid 0, 1 and 2, because although they would produce valid output, that output can hardly be regarded as X. Even the output for 3 and 4 is rather ugly ;-)
However, here's the output of printX(7, '7'):
7 7
7 7
7 7
7
7 7
7 7
7 7