1.输出布尔数据

2.输出整型数据

3.输出浮点数

4.取消省略空白符

5.istringstream使用

6.ostringstream使用

7.读取文件

8.写入文件

#include <iostream>
#include <iomanip>
#include <sstream>
#include <string>
#include <fstream>using namespace std;/** 1.输出布尔数据* 2.输出整型数据* 3.输出浮点数* 4.取消省略空白符* 5.istringstream使用* 6.ostringstream使用* 7.读取文件* 8.写入文件* */int main() {bool falg = false;cout << "falg="<< falg <<endl;cout << "falg=="<< boolalpha << falg <<endl;cout << showbase;cout << "十进制"<< dec << 9 << endl;cout << "八进制"<< oct << 9 << endl;cout << "十六进制"<< hex << 12 << endl;cout << noshowbase;double PI = 3.14159265358979323846;cout.precision(3);cout << "pi="<< PI << endl;cout << setprecision(5) << "pi=="<< PI << endl;float f = 13.10000;cout << showpoint << "f="<<f << noshowpoint << endl;cin >> noskipws;char c;cout << "请输入字符： "  << endl;cin >> c;cout << c;cin >> skipws;string s1 = "abc def";istringstream stream(s1);string s2;while (stream >>s2){cout << s2 << endl;}int aa = 5;double bb = 3.142351;string str = "";ostringstream oss;oss << aa << "---"<< bb;str = oss.str();cout << str << endl;fstream file("D:\\CLionProjects\\Mytest\\day07\\04_do_io\\a.txt",ios::in);if(file.is_open()){string line;while (getline(file,line)){cout<< line <<endl;}file.close();}else{cout<< "文件无法打开"<<endl;}fstream file2{"D:\\CLionProjects\\Mytest\\day07\\04_do_io\\a2.txt",ios::app};if(file2.is_open()){cout<< "正常打开文件"<<endl;file2 << ",ni hao";file2 << endl;file2.close();}else{cout<< "无法正常打开文件"<< endl;}return 0;
}