@hussanali
this code is incomplete, some of the alphabets loop needs modification ....though I think you can continue from here...will update if I got it in the meantime....
first run this and check the result....trying C++ again after leaving college 7 years back....so
#include<iostream.h>
#include<conio.h>
int main()
{
int i,j,k,l;
char letter;
cout << "enter";
cin >> l;
cout << "\n";
for(i=1, letter='A';i<=l;i++,letter++)
{
for(j=l;j>=i;j--)
{
cout << "!";
}
cout <<letter;
cout << "\n";
}
return 0;
}