This is my code:
for (int i = 4; i >= 1; i--) {
for (int j = 1; j < i; j++) {
System.out.print(" ");
}
for (int k = i; k <= 4; k++) {
System.out.print(k+"");
}
System.out.println();
}
Current output:
4
34
234
1234
Desired output:
1
21
321
4321
What changes are necessary in order for me to get the desired output as shown above?
Let the first loop (i) run from 1 to 4 and the second (j) from 4 to i. This reverses your output.
You did every thing right, just the last for should have a very minor change:
for (int k = 5-i; k >= 1; k--){
Here you go:
public static void main(String[] args) {
for (int i = 1; i <= 4; i++) {
for (int j = 4; j > i; j--) {
System.out.print(" ");
}
for (int k = i; k >= 1; k--){
System.out.print(k + "");
}
System.out.println();
}
}
Your loops are incorrect, you can refer the below code with inline comments:
for (int i = 1; i <= 4; i++) { //iterate from 1 to 4
//Loop from i+1 to insert spaces first
for (int j = i+1; j <= 4; j++) {
System.out.print(" ");
}
//Loop from i to insert the number next to each other
for (int j = i; j >= 1; j--) {
System.out.print(j);
}
System.out.println(); //insert a new line
}
for (int i = 1; i <= 4; i++)
{
for (int k = i; k <= 4; k++)
{
System.out.print(" ");
}
for (int j = 1; j < i; j++)
{
System.out.print(j);
}
System.out.println();
}