C program to print the right half star pyramid pattern
kw.c
#include <stdio.h>
int main()
{
    int i, j;
    for (i = 1; i <= 10; i++)
    {
        for (j = 1; j <= i; j++)
        {
            printf("*");
        }
        printf("\n");
    }
}
Output
kodingwindow@kw:~$ gcc kw.c
kodingwindow@kw:~$ ./a.out
*
**
***
****
*****
******
*******
********
*********
**********
kodingwindow@kw:~$
C program to print the left half star pyramid pattern
kw.c
#include <stdio.h>
int main()
{
    int i, j;
    for (i = 1; i <= 10; i++)
    {
        for (j = 1; j <= 10 - i; j++)
            printf(" ");
        for (j = 1; j <= i; j++)
        {
            printf("*");
        }
        printf("\n");
    }
    return 0;
}
Output
kodingwindow@kw:~$ gcc kw.c
kodingwindow@kw:~$ ./a.out
         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********
kodingwindow@kw:~$
C program to print the inverted right half star pyramid pattern
kw.c
#include <stdio.h>
int main()
{
    int i, j;
    for (i = 10; i >= 1; i--)
    {
        for (j = 1; j <= i; j++)
        {
            printf("*");
        }
        printf("\n");
    }
    return 0;
}
Output
kodingwindow@kw:~$ gcc kw.c
kodingwindow@kw:~$ ./a.out
**********
*********
********
*******
******
*****
****
***
**
*
kodingwindow@kw:~$
C program to print the inverted left half star pyramid pattern
kw.c
#include <stdio.h>
int main()
{
    int i, j;
    for (i = 10; i >= 1; i--)
    {
        for (j = 1; j <= 10 - i; j++)
            printf(" ");
        for (j = 1; j <= i; j++)
        {
            printf("*");
        }
        printf("\n");
    }
    return 0;
}
Output
kodingwindow@kw:~$ gcc kw.c
kodingwindow@kw:~$ ./a.out
**********
 *********
  ********
   *******
    ******
     *****
      ****
       ***
        **
         *
kodingwindow@kw:~$
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