#include <iostream>
using namespace std;
int main()
{
    int a;
    cin >> a;
    if ((a<100)&&(a>9))//先判断是不是两位数。
    {
        if (a%2==0)//再判断是不是偶数
        {
            cout << "Yes";
        }
        else
        {
            cout << "No";
        }
    }
    else
    {
        cout << "No";
    }
    return 0;
}

点个赞再走！！

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin >> n;
    if(n%2==0/*是偶数*/&&n/2>=5/*最小的两位偶数10÷2=5*/&&n/2<=49/*最大的两位偶数98÷2=49*/){
        cout << "Yes";
    }
    else{
        cout << "No";
    }
    return 0;
}
/*               ^
                / \
               /   \
              /     \
             /       \
            /         \
             |        |
             |   中   |   
    ^        |   国   |       ^
   /  \     |    航    |    /  \
  /    \   |     天     |  /    \
 /      \ |             | /      \
//////////               \\\\\\\\\\
|        |               |        |
|        |               |        |
|        |               |        |
|        |               |        |
|        |               |        |
|        |               |        |
|        |               |        |
/||||||||\ \           / /||||||||\
|||||||||| /|||||||||||\ ||||||||||
          /|||||||||||||\
         /|||||||||||||||\
         |||||||||||||||||
         先点赞       后搬运
                                   */

我的代码才是最简洁的

#include <iostream>
int main()
{
    std::cout << "No";
    return 0;
}

#include <iostream>
using namespace std;
int main()
{
    int n;
    cin >> n;
    if(n / 10 > 0 and n / 10 < 10)
    {
        if(n % 2 == 0)
        {
            cout << "Yes";
        }
        else
        {
            cout << "No";
        }
    }
    else
    {
        cout << "No";
    }
    return 0;
}

#include <iostream>
using namespace std;
int main()
{
    int n;
    cin >> n;
    if(n / 10 > 0 and n / 10 < 10)
    {
        if(n % 2 == 0)
        {
            cout << "Yes";
        }
        else
        {
            cout << "No";
        }
    }
    else
    {
        cout << "No";
    }
    return 0;
}

#include <iostream> using namespace std; int main() { int x; cin >> x; if ((x % 2 == 0) and (x >= 10) and (x < 99)) { cout << "Yes" << endl; } else { cout << "No" << endl; } return 0; }

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,n;
    n=a/100;
    cin>>a;
    if(a%2==0 and n==0){
        cout<<"Yes";
    }
    else
        cout<<"No";
}

#include<bits/stdc++.h> using namespace std; int main() { int a; cin >> a; if ((a / 10) < 10 && a % 2 == 0 && a / 10 > 0) cout << "Yes"; else cout << "No"; return 0; }

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int a;
    cin >> a;
    if ((a / 10) < 10 && a % 2 == 0 && a / 10 > 0){
        cout << "Yes";
}
    else{
        cout << "No";
}
    return 0;
}

#include<iostream>
using namespace std;
int main()
{
    int a;
    cin >> a;
    if (a % 2 == 0)
    {
        if (a < 100)
        {
            if (a > 9)
            {
                cout << "Yes";
            }
            else
            {
                cout << "No";
            }
        }
        else
        {
            cout << "No";
        }
    }
    else
    {
        cout << "No";
    }

}

嘻嘻，简洁的代码来喽！！

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin >> n;
    if(n <= 99 && n >= 10 && n % 2 == 0) cout << "Yes";
    else cout << "No";
}

先赞后看，养成习惯！

#include <bits/stdc++.h> 
using namespace std;
int main()
{
    int n;
    cin >> n;
    if (n % 2 == 0 and n > 9 and n < 100)
    //判断是否为偶，非一&三位数
    {
        cout << "Yes";//是
    }
    else
    {
        cout << "No";//否
    }
    return 0;
}

#include <bits/stdc++.h> using namespace std; int main() { int a; cin>>a; if(a/10<10){ if(a/10>0){ if(a%2==0){ cout<<"Yes"; }else{ cout<<"No"; } }else{ cout<<"No"; } }else{ cout<<"No"; } return 0; }

题解：两位数并且是偶数 判断是两位数

n/10<10;//十位数一定是0~9.
n/10>0；//int类型，n除以10大于0，是为了防止是一位数。

最后判断偶数

#include <bits/stdc++.h> using namespace std; int main() { int n; cin>>n; if(n/10<10&&n/10>=1) { if(n%2==0) { cout<<"Yes"; } else { cout<<"No"; } } else { cout<<"No"; } return 0; }

#include <bits/stdc++.h>
using namespace std;
int main()
{
    cout << "No";
    return 0;
}

简单易懂

我悟了