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Hollow Star Right Triangle
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Hollow Star Right Triangle
Here in this pattern printing, the number of lines of the pattern is taken as the input. Two for loops are used to display the pattern. The first for loop (the outer for loop) is used to count the line number so the loop is from 1 to n. here the stars are printed only for the boundary positions. That is for each line i(except the last line), the star is printed at the 1st position and at the ith position. For the last line i.e. the nth line n numbers of stars are printed.
Algorithm
INPUT: the number of lines
OUTPUT: the aforesaid pattern
PROCESS:
Step 1: read n [the number of lines]
Step 2: for i=1 to n repeat
For j=1 to i repeat
If j=1 or j=i or i=n then
Print ‘*’
Else
Print “ “
[End of ‘if’]
[End of ‘for’ loop]
Move to the next line
[End of ‘for’ loop]
Step 3: stop.
Code
Time Complexity:
for(i=1;i<=n;i++)----------------------------------------- n
{ for(j=1;j<=i;j++)-------------------------------- i
{
if(j==1||j==i||i==n)
printf("*");
else
printf(" ");
}
printf("\n");
}
The complexity is: O(n*i)=O().
