有如下结构体类型说明: struct job_exam { unsigned num; char name[20]; int exama; int examb; int total; }a,s[10]; 若要定义一个指向结构体变量s[10]的指针变量p,以下选项哪个正确?
A.
struct job_exam *p; p=a;
B.
struct job_exam *p; p=&a;
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