*****
****
***
**
*
**
***
****
*****
/**
* C program to print left arrow star pattern
*/
#include <stdio.h>
int main()
{
int i, j, n;
// Input number of rows from user
printf("Enter value of n : ");
scanf("%d", &n);
// Print upper part of the arrow
for(i=1; i<n; i++)
{
// Print trailing (n-rownumber) spaces
for(j=1; j<=(n-i); j++)
{
printf(" ");
}
// Print inverted right triangle
for(j=i; j<=n; j++)
{
printf("*");
}
printf("\n");
}
// Print bottom part of the arrow
for(i=1; i<=n; i++)
{
// Print trailing (rownumber-1) spaces
for(j=1; j<i; j++)
{
printf(" ");
}
// Print the right triangle
for(j=1; j<=i; j++)
{
printf("*");
}
printf("\n");
}
return 0;
}
OutputEnter value of n : 5
*****
****
***
**
*
**
***
****
*****
Basic C programming, For loop, Nested loop
Let's first divide this pattern in two parts to make our task easy.
*****
****
***
**
**
***
****
*****
If you have noticed number of spaces in the upper part per row is n - rownumber and bottom part contains rownumber - 1 spaces per row (where n is the total number of rows). If you ignore the leading spaces in both parts you will notice that the upper part is similar to inverted right triangle and lower part is similar to right triangle star pattern.
First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.