请大神帮帮我，我一直过不去

#include <iostream>
using namespace std;
int main()
{
	int a,b,d,i, i2;
	char c;
	cin>>a>>b>>c>>d;
	if(d==0){
		for(i=1;i<=a;i++){
			if(i==1){
				for(i2=1;i2<=b;i2++){
					cout<<c;
				}
				cout<<"\n";
			}
			else if(i>=2&&i<=(b-1)){
				cout<<c;
				for(i2=1;i2<=(b-2);i2++){
					cout<<' ';
				}
				cout<<c;
				cout<<"\n";
			}
			else{
				for(i2=1;i2<=b;i2++){
					cout<<c;
				}
			}
		}
	}
	else{
		for(i=1;i<=a;i++){
			for(i2=1;i2<=b;i2++){
				cout<<c;
			}
			cout<<"\n";
		}
	}
    return 0;
}