#include <iostream>
using namespace ::std;
int main() {
ios_base::fmtflags original_flags = cout.flags(); //保存cout參數(shù)設(shè)置
cout<< 812<<'|';//輸出 
cout.setf(ios_base::left,ios_base::adjustfield); //左對(duì)齊值
cout.width(10); //將cout寬度改為10
cout<<813<<815<<'\n';//輸出 
cout.unsetf(ios_base::adjustfield); //取消cout對(duì)齊方式的設(shè)置
cout.precision(2);// 設(shè)置浮點(diǎn)數(shù)輸出的精度值
cout.setf(ios_base::uppercase|ios_base::scientific); //以科學(xué)格式顯示浮點(diǎn)數(shù) 
cout <<831.0;//輸出 
cout.flags(original_flags); //恢復(fù)cout原參數(shù)設(shè)置
return 0;
}

#include<iostream>
#include<fstream>
using namespace std;
int main(){   
    ofstream out("text1.txt");
    out<<"已成功寫入文件！";
    out.close(); 
    return 0;
 } 

#include<iostream>
#include<fstream>
using namespace std;
int main(){   
ifstream put("text1.txt");
string t;
getline(put,t);
cout<<t;
put.close();
return 0; 
}