/* switch(表达式){ case 表达式1:->if() case 表达式2:->if else() ````` ->if else() ````` ````` default: ->else } */ # include<iostream> using namespace std; int main(){ int a; cin>>a; switch(a){ case 1: case 3: case 5: cout<<"NO"<<endl; break; case 2: case 4: case 6: case 7: cout<<"YES"<<endl; } return 0; }