实验7

Posted 2020-11-19 miaorui1314

#include<iostream>
using namespace std;
int main()
{
    ios_base::fmtflags original_flags = cout.flags();//保存当前格式
    cout << 812 << ‘|‘;
    cout.setf(ios_base::left, ios_base::adjustfield);//左对齐
    cout.width(10);                              //设置宽度为10
    cout << 813 << 815 << ‘
‘;
    cout.unsetf(ios_base::adjustfield);      //设置为默认
    cout.precision(2);
    cout.setf(ios_base::uppercase | ios_base::scientific); //显示16进制大写，以及E|使用科学记数法
    cout << 831.0;
    cout.flags(original_flags);//设置为初始格式设置
    return 0;
}

11-3

 

#include<iostream>
#include<fstream>
using namespace std;
int main()
{
    ofstream file;
    file.open("text1.txt");
    file << "已成功写入文件";
    file.close();
    return 0;
}

11-4

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