#include<bits/stdc++.h> using namespace std; int main(){ /** 字符 char 整数 int longlong 小数 float double 布尔 bool cin>> a; scanf("%lld",&q); printf("%lld",q); cout<<a; if(){ }else if(){ }else{ } int n; cin>>n; if(n % 3==0 && n % 5 ==0 && n % 7 ==0){ cout<<"3 5 7"; }else if(n % 3 == 0 && n % 5 ==0){ cout<<"3 5"; }else if(n % 3 == 0 && n % 7 ==0){ cout<<"3 7"; }else if(n % 5 == 0 && n % 7 ==0){ cout<<"5 7"; }else if( n % 3 ==0){ cout<<"3"; } else if( n % 5 == 0){ cout<<"5"; }else if ( n % 7 == 0){ cout<<"7"; }else{ cout<<'n'; } char a; cin>>a; cout<<" "<<a<<endl; cout<<" "<<a<<a<<a<<endl; cout<<a<<a<<a<<a<<a; if(is -sunny == "True"){ cout<<"玩"; }else if(open){ }else{ } //30 热天 15_30 好天气 15以下 冷天 int a; cin>>a; if(a>30){ cout<<"热天"; }else if(a > 15) { cout<<"好天气"; }else { cout<<"冷天"; } // if(a >30){ }else{ if(){ } } // ABCDE int a; cin>>a; if( a >= 90){ cout<<"A"; }else if(a >=80 ){ cout<<"B"; } else if(a >=70){ cout<<"C"; }else if(a >=60){ cout<<"D"; }else{ cout<<"E"; } **/ int op; cin>>op; switch(op){//op=='+' case 1: case 3: case 5: case 7: case 8: case 10: case 12: cout<<31; break; case 4: case 6: case 9: case 11: cout<<30; break; case 2: cout<<29; break; default: cout<<"Invalid."; } return 0; }