About Memory Alocation

Hi Friends this is question for ‘C” Family,
Can two auto veriable one is single variable of type int and another is an array of int,uses same location(NOTE: I am not using UNION)? And that too I tested on two m/cs of different RAM(one is 62MB and another is 128MB)but still I am getting the same problem.
And what is possibality of same variable uses same address in memory when i run program different time???