#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,b,c;char n;
    cin>>a>>b>>n>>c;
    if (c)
    {
        for (int i=1;i<=a;i++)
        {
            for (int j=1;j<=b;j++)
                cout<<n;
            cout<<endl;
        }    
    }
    else
    {
        for (int i=1;i<=b;i++)
        {
            cout<<n;
        }
        cout<<endl;
        for (int i=1;i<=a-2;i++)
        {
            cout<<n;
            for (int j=1;j<=b-2;j++)
            {
                cout<<' ';
            }
            cout<<n<<endl;
        }
        for (int i=1;i<=b;i++)
        {
            cout<<n;
        }
        cout<<endl;
    }
    return 0;
} 

为什么我写得那么长啊···

`

#include<bits/stdc++.h>
using namespace std;
void One(int b,int a,char s){
    for(int i=1;i<=a;i++){
        for(int j=1;j<=b;j++){
            cout<<s;
        }
        cout<<endl;
    }
}
void Zero(int b,int a,char s){
    for(int i=1;i<=a;i++){
        for(int j=1;j<=b;j++){
            if(i==1 || i==a || j==1 || j==b) cout<<s;
            else cout<<" ";
        }
        cout<<endl;
    }
}
int main(){
    int a,b,n;
    char s;
    cin>>a>>b>>s>>n;
    if(n==0) Zero(b,a,s);
    else if(n==1) One(b,a,s);
    return 0;
}

#include <iostream>
int main(){
    int h,w,q;char a;std::cin>>h>>w>>a>>q;
    for(int i=1;i<=h;i++){
        for(int j=1;j<=w;j++){
            if(i==1||i==h||j==1||j==w||q==1) std::cout<<a;
            else std::cout<<" ";}
        std::cout<<"\n";}
    return 0;}

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,d;
    char c;
    cin>>a>>b>>c>>d;
    if (d==1)
    {
        for (int i=1;i<=a;i++)
        {
            for (int j=1;j<=b;j++)
            {
                cout<<c;
            }
            cout<<endl;
        }
    }
    else
    {
        for (int i=1;i<=a;i++)
        {
            for (int j=1;j<=b;j++)
            {
                if (i==1 || j==1 )
                {
                    cout<<c;
                }
                else if(i==a || j==b)
                {
                    cout<<c;
                }
                else
                {
                    cout<<" ";
                }
            }
            cout<<endl;
        }
    }
    return 0;
}
呵呵，就说有一亿点长好吧🤭
```点个赞呗！

#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	int n,m;
	char a;
	bool b;
	cin>>n>>m>>a>>b;
	for(int i =1;i<=n;i++){
		for(int j = 1;j<=m;j++){
			if(i == 1||i == n){
				cout<<a;
			}
			else{
				if(b){
					cout<<a;
				}
				else if(j==1||j==m){
					cout<<a;
				}
				else{
					cout<<" ";
				}				
			}
		}
		cout<<"\n";
	}
}

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int a,b;
    char c;
    int d;
    cin >> a >> b >> c >> d;
    if(d == 1)
    {
        for(int i = 1;i<=a;i++)
        {
            for(int j = 1;j<=b;j++)
            {   cout << c;
                
            }
            cout << endl;
        }
        
    }
    else if(d == 0)
    {
        for(int i = 1;i<=a;i++)
        {
            for (int j = 1;j<=b;j++)
            {
                if(i == 1||i ==a||j ==1||j==b)
                    cout << c;
                else
                    cout << " ";
            }
            cout << endl;
        }
    }
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,b,c;char n;
    cin>>a>>b>>n>>c;
    if (c)
    {
        for (int i=1;i<=a;i++)
        {
            for (int j=1;j<=b;j++)
                cout<<n;
            cout<<endl;
        }    
    }
    else
    {
        for (int i=1;i<=b;i++)
        {
            cout<<n;
        }
        cout<<endl;
        for (int i=1;i<=a-2;i++)
        {
            cout<<n;
            for (int j=1;j<=b-2;j++)
            {
                cout<<' ';
            }
            cout<<n<<endl;
        }
        for (int i=1;i<=b;i++)
        {
            cout<<n;
        }
        cout<<endl;
    }
    return 0;
}

更适合中国宝宝体制的代码