C Program Pattern
Program to print Hourglass Pattern
Example
#include <stdio.h>
int main()
{
int i, j, k, rows;
printf("Enter the no. of rows: ");
scanf("%d", &rows);
printf("Output: \n\n");
for (i = 1; i <= rows; i++)
{
for (k = 1; k < i; k++)
printf(" ");
for (j = i; j <= rows; j++)
printf("* ");
printf("\n");
}
for (i = rows - 1; i >= 1; i--)
{
for (k = 1; k < i; k++)
printf(" ");
for (j = i; j <= rows; j++)
printf("* ");
printf("\n");
}
return 0;
}
C Program to Print Hollow Square Star Pattern
Explain Program
Step :1
#include <stdio.h>
standard input/output library to use functions
like printf() and scanf().
int main()
{
int n, a, k;
Declares three integer variables:
n: number of rows for the top half of the diamond.
k: used for looping through rows.
a: used for spaces and asterisks within each row.
printf("Enter
number of rows\n");
scanf("%d", &n);
input the number of rows determines
the size of the diamond
for (k = 1; k <=
n; k++)
{
for (a = 1; a
<= n-k; a++)
printf("
");
for (a = 1; a
<= 2*k-1; a++)
printf("*");
printf("\n");
}
loop prints the top half of the diamond.
Spaces: n - k spaces before stars
Stars: 2 * k - 1 stars
k from 1 to n row has 2 * n - 1 stars.
Bottom Half of the Diamond
for (k = 1; k <=
n - 1; k++)
{
for (a = 1; a
<= k; a++)
printf("
");
for (a = 1 ; a
<= 2*(n-k)-1; a++)
printf("*");
printf("\n");
}
This loop print the bottom half of the diamond.
Spaces: k spaces.
Star 2 * (n - k) - 1 stars
loop from k = 1 to n - 1 because the middle line
return 0;
}
Ends the program.
C Program to print Hourglass Pattern
Output
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