C puzzler (type conversion mystery?)

[Greg Sepesi]

#include <stdio.h>
void main() {
   unsigned long b, t;
   unsigned short tmp;

   b = 5621;
   tmp = 14365;
   t = b + (tmp%100) * 10000L;
   b |= (tmp%100) * 10000L;

   printf(
      "t = %d\n"
      "b = %d\n",
      t, b);
}

output:
t = 655621
b = 655349

question:
Why are t and b not the same?

compilers tested: gnu & MS

- Greg

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