实验7

Posted 2020-11-19 perservence

//11-7 
#include<iostream>
using namespace std;
int main(){
    ios_base::fmtflags original_flags=cout.flags();//保存现有的格式化参数设置 
    cout<<812<<‘|‘;
    cout.setf(ios_base::left,ios_base::adjustfield);//把对齐方式由原来的右对齐改为左对齐 
    cout.width(10);//把输出的字符串的宽度设为10
    cout<<813<<815<<‘
‘;
    cout.unsetf(ios_base::adjustfield);//清除对齐方式的设置 
    cout.precision(2);
    cout.setf(ios_base::uppercase|ios_base::scientific);//科学格式显示大写字母E，更改浮点数的显示设置，以科学格式显示浮点数值 
    cout<<831.0;
    cout.flags(original_flags);
    return 0;
} 

 

 

#include<iostream>
#include<fstream>
using namespace std;
int main()
{
    ofstream out("test1.txt");
    if(!out)
    {
        cout<<"fail to open"<<endl;
        return 1;
    }
    out<<"已成功写入文件!";
    out.close();
    return 0;
} 

 

 

 

//11-4
#include<iostream>
#include<fstream>
#include<string> 
using namespace std;
int main()
{
    
        ifstream outFile("D:\\text1.txt");
        string file;
        if(outFile)
        {
            while(getline(outFile,file))
            {
                cout<<file<<endl;
            }
        }
        outFile.close();
    return 0;
}