1, I and j are two integer variables, I = 3, J = 5 (I and j are arguments), *p, *q and *r are pointer variables;

2.int * f (int *s, int *t) is a function, and * s and *t are the formal parameters of this function. The return value of this function is also a pointer variable; * p = & ampI, indicating that the address of variable I is assigned to * p; Similarly, the address of j is assigned to * q；;

3. The values of arguments can be passed to the formal parameters in the function, provided that the formal parameters are of the same type;

Note: the function of int *f(int *s, int *t) is to judge *s and * t if * s.

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