A good question usually asked at interviews,-

/**************************/
int * func(int, int);
void main()
{
int *ptr = func(2,3);
printf("\nHello World!\n");
printf("\n%d\n",*ptr);
}
int * func(int i, int j)
{
int k = i + j;
return &k;
}
/**************************/
What will be the output of the above program?
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Here is the output,-
Hello World!
Garbage Value

Note that Garbage Value will be printed here instead of 5. This is because once the control returns from func() to the main(), the address of local variable 'k' is free. So the contents of this address can be modified by anybody else.