用流对象的成员函数控制输出格式

#include

using namespace std;

int main()

{  int a;

 cout<<"input a:";

 cin>>a;  

//cout.setf(ios::unitbuf);                               //每次输出之后刷新所有的流  

//cout.setf(ios::stdio);                                 //每次输出之后清除stdout,stderr  

cout.setf(ios::showbase);                                      //设置输出时的基数符号（八进制以0打头，十六进制以0x打头）

cout<<"dec:"<                                         //默认以十进制形式输出  

cout.unsetf(ios::dec);                                          //终止十进制输出的格式  

cout.setf(ios::hex);                                             //设置以十六进制输出状态

 cout<<"hex:"<

cout.unsetf(ios::hex);                                           //终止以十六进制输出状态  

cout.setf(ios::oct);                                              //设置以八进制输出状态  

cout<<"oct:"<

cout.unsetf(ios::oct);                                           //终止以八进制输出状态

 int b;  

cout<<"input b:";

 cin>>b;  

cout.setf(ios::uppercase);                                     //以十六进制输出字母时以大写字母表示  

cout.setf(ios::hex);

 cout<<"b的十六进制："<

cout.unsetf(ios::uppercase);                                    //终止以十六进制输出字母时以大写字母表示状态  

char *pt="China";  

cout.width(10);                                                //指定域宽为10，并且只对其后的第一个输出有效  

cout<

 cout.width(10);

 cout.fill('*');                                                    //指定空白处以‘*‘填充

 cout<

 cout.width(10);

 cout.fill('*');

 cout.setf(ios::left);                                             //输出数据在本文域宽范围内向左对齐  

cout<

cout.unsetf(ios::left);                                            //终止输出数据在本文域宽范围内向左对齐状态

 cout.width(10);

 cout.fill('*');

 cout.setf(ios::right);                                              // 输出数据在本文域宽范围内向右对齐

 cout<

cout.unsetf(ios::right);                                                 //终止输出数据在本文域宽范围内向右对齐

 cout.width(10);

 cout.fill('*');  

cout.setf(ios::internal);                                   //数值的符号位在域宽内左对齐，数值右对齐，中间由填充字符填充  cout<

 cout.unsetf(ios::internal);                                 //终止数值的符号位在域宽内左对齐，数值右对齐，中间由填充字符填充  

double pi=22.0/7.0;  

cout.fill('*');  

cout.setf(ios::scientific);                                   //浮点数以科学记数法格式输出                     

 cout<<"pi="<

cout<<"pi=";  

cout.width(16);  

cout.setf(ios::uppercase);  

cout<

 cout.unsetf(ios::scientific);                                    //终止浮点数以科学记数法格式输出

 cout.unsetf(ios::uppercase);  

cout.width(12);  

cout.setf(ios::showpos);                                           //对正数显示‘+’号  

cout<<"pi="<

cout<<"pi=";  

cout.width(10);  

cout.setf(ios::internal);  

cout<

 cout.precision(6);                                              //设置实数的精确度为6  

cout<<"pi="<

 cout.setf(ios::fixed);                                               //指定用定点形式输出  

cout<<"pi="<

 return 0;

}

 

转载于:https://www.cnblogs.com/hupolinglong/articles/yldxcyhskzsc.html