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switch(std::tolower(letter)*(std::isalpha(letter)!=0)){....}中"*"是什么意思?

#include<stdio.h>struct student{int num; char name; char sex; int age; float score;}stu={{{3,1,0,6,0,0,9,4,6,9},"fangshaowu",'M',20,{88,80,90}},{{1,0,0,0,0,0,0,0,0,0},"zhang"...