哪位大神帮我发一下正确代码？

#include<iostream>
using namespace std;
int main(){
    int a,b,c,f;
    cin>>a>>b>>c>>f;
    if(f==0){
        for(int i=1;i<=b;i++){
            for(int j=1;j<=a;j++){
                if((i==1)||(i==b)){
                    cout<<c;
                    cout<<endl;
                    return 0;
                }
                else{
                    cout<<c;
                    cout<<" ";
                    cout<<c;
                    cout<<endl;
                    return 0;   
                }
            }
        }
        return 0;
    }
    else{
        for(int i=1;i<=a;i++){
            for(int j=1;j<=b;j++)
                cout<<c;
            cout<<endl;
        }
    }
    return 0;
}