C++格式化输出

//============================================================================
// Name        : CppStudy.cpp
// Author      : CaiMin
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <iostream>
#include <iomanip>
using namespace std;

int main() {
	//控制输出宽度
	cout << setw(8) << 123.456 << setw(5) << 1234 << endl;

	//控制输出对齐方式
	cout << 12345 << endl;
	cout << setw(10) << 12345 << endl; //默认左对齐
	cout << setiosflags(ios::left) << setw(10) << 12345 << endl;

	//控制输出的填充字符
	cout << setiosflags(ios::right);
	cout << setfill('*');
	cout << 12345 << endl;
	cout << setw(10) << 12345 << endl;

	//控制输出精度
	double pi = 3.141593;
	cout << pi << endl;
	cout << setprecision(3) << pi << endl;
	cout << setprecision(5) << pi << endl;

	pi = 123.456789;
	cout << setiosflags(ios::scientific);//指数形式输出
	cout << pi << endl;
	cout << setprecision(3) << pi << endl;
	cout << setprecision(5) << pi << endl;

	//输出小数点和正号
	double a = 10.0;
	cout << a << endl;
	cout << setiosflags(ios::showpoint) << a << endl;
	cout << setiosflags(ios::showpos) << a << endl;

	//不同进制的输出
	int num = 10;
	cout << num << endl;
	cout << oct << num << endl;
	cout << hex << num << endl;
	cout << setiosflags(ios :: uppercase) << num << endl;

	return 0;
}