Print Triangle inside a rectangle

Hello,
I want to print a triangle, made of blanks or asterics inside a
rectangle made of alphabets.
It's as follows;
ABCDEFGFEDCBA
ABCEEF FEDCBA
ABCDE EDCBA
ABCD DCBA
ABC CBA
AB BA
A A

It has 7 rows and 13 columns. I tried to implement like this;
do {
if(j == rows) //int j=0, int row=1
for(int c=0;c<arr.length;c++) //char
arr[]={'A','B','C','D','E','F','G','F','E',.....};
if(c==maxCol) //int maxCol=6;
arr[c]=b; //char b = ' ';
----------------------------------------------------
_FROM THIS POINT I CAN'T PROCEED!____________________________
for(blank=0;blank<maxBlank;blank++)
arr[blank]=b;
maxBlank+=2;
maxCol--;
row++;
j++;



}while(j<=6);


Plz help.

.

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