如何将格式化调成以下样式：

#include<bits/stdc++.h>
using namespace std;
int d[4]={1,2,3,4};
int main(){
	for(int i=1;i<=n;i++){
		cout<<d[i]<<" ";
	}
	switch(d[1]){
		case 1:
			cout<<1;
			break;
		case 2:
			cout<<2;
			break;
		default:
			cout<<3;
			break;
	}
	cout<<"hello world!";
	return 0;
}