pyramid of characters v1.c

/*
C program to print following character pyramid:
Enter number of lines: 5

 ABCDEFGFEDCBA
 ABCDE   EDCBA
 ABCD     DCBA
 ABC       CBA
 AB         BA
 A           A

Enter number of lines: 7

 ABCDEFGHIHGFEDCBA
 ABCDEFG   GFEDCBA
 ABCDEF     FEDCBA
 ABCDE       EDCBA
 ABCD         DCBA
 ABC           CBA
 AB             BA
 A               A

*/

#include<stdio.h>

int main()
{
  int i,j,k,n;
  char ch;

// enter 5 number of lines, n=5
  printf("\n Enter number of lines: ");
  scanf("%d",&n);

  printf("\n");

  for(i=0; i<=n; i++)
  {
    ch = 'A';

    for(j=0; j<=n-i; j++, ch++)
      printf("%c",ch);

    if(i==0)
      printf("%c",ch);
    else
      for(k=0; k<(2*i)+1; k++)
        printf(" ");

    ch--;
    for(j=0; j<=n-i; j++, ch--)
      printf("%c",ch);

    printf("\n");
  }

  return 0;
}