若有以下程序 #include typedef struct stu { char name[10], gender; int score; } STU; void f(STU a, STUB) { b = a; printf( "%s,%c,%d,", b.name, b.gender, b.score ); } main() { STU a={"Zhao", 'm', 290}, b={"Qian", 'f', 350}; f(a,b); printf("%s,%c,%d\n", b.name, b.gender, b.score); } 则程序的输出结果是