有以下程序 struct STU{ char name[10]; int num; }; voi/D f1(struct STU c) { struct STU b={"LiSiGuo",2042}; c=b;} voi/D f2(struct STU *c) { struct STU b={"Sun/Dan",2044}; *c=b; } main( ) { struct STU a={"YangSan",2041},b={"WangYin",2043}; f1(a);f2(&b); printf("%/D %/D\n",a.num,b.num);} 执行后的输出结果是 ()。