big12.c  compiled  gcc -o big12 big12.c (64 bit long)
-m64 needed on some older OS 
sizeof(sizeof(int))=8, sizeof needs pct ld 
sizeof(int)=4, sizeof(int1)=4 
sizeof(long)=8, sizeof(long1)=8 
sizeof(long long)=8, sizeof(llong1)=8 
sizeof(float)=4, sizeof(fl1)=4 
sizeof(double)=8, sizeof(d1)=8 
sizeof(size_t)=8, sizeof(sz1)=8 
sizeof(int *)=8, sizeof(p1)=8 
n factorial with n of type long 
0 ! = 1 
1 ! = 1 
2 ! = 2 
3 ! = 6 
4 ! = 24 
5 ! = 120 
6 ! = 720 
7 ! = 5040 
8 ! = 40320 
9 ! = 362880 
10 ! = 3628800 
11 ! = 39916800 
12 ! = 479001600 
13 ! = 6227020800 
14 ! = 87178291200 
15 ! = 1307674368000 
16 ! = 20922789888000 
17 ! = 355687428096000 
18 ! = 6402373705728000 
19 ! = 121645100408832000 
20 ! = 2432902008176640000 
21 ! = -4249290049419214848 
22 ! = -1250660718674968576 
23 ! = 8128291617894825984 
24 ! = -7835185981329244160 
trying to malloc 10GB 
malloc returned 
stored 10GB of 'a'