C program to print the alphabets diamond pattern
kw.c
#include <stdio.h>
int main()
{
    int a = 65, n = 12, i, j, k;
    for (i = 0; i < n; i++)
    {
        for (j = 0; j < (n - i); j++)
            printf(" ");
        for (k = 0; k <= i * 2; k++)
            printf("%c", a + k);
        printf("\n");
    }
    for (i = n; i >= 0; i--)
    {
        for (j = 0; j < n - i; j++)
            printf(" ");
        for (k = 0; k <= i * 2; k++)
            printf("%c", a + k);
        printf("\n");
    }
    return 0;
}
Output
kodingwindow@kw:~$ gcc kw.c
kodingwindow@kw:~$ ./a.out
            A
           ABC
          ABCDE
         ABCDEFG
        ABCDEFGHI
       ABCDEFGHIJK
      ABCDEFGHIJKLM
     ABCDEFGHIJKLMNO
    ABCDEFGHIJKLMNOPQ
   ABCDEFGHIJKLMNOPQRS
  ABCDEFGHIJKLMNOPQRSTU
 ABCDEFGHIJKLMNOPQRSTUVW
ABCDEFGHIJKLMNOPQRSTUVWXY
 ABCDEFGHIJKLMNOPQRSTUVW
  ABCDEFGHIJKLMNOPQRSTU
   ABCDEFGHIJKLMNOPQRS
    ABCDEFGHIJKLMNOPQ
     ABCDEFGHIJKLMNO
      ABCDEFGHIJKLM
       ABCDEFGHIJK
        ABCDEFGHI
         ABCDEFG
          ABCDE
           ABC
            A
kodingwindow@kw:~$
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