C++语言基础 例程 字符串流

贺老师的教学链接  本课讲解

例：“写”字符数组

#include<iostream>#include <strstream>using namespace std;struct student{    int num;    char name[20];    float score;};int main( ){    student stud[3]= {1001,"Li",78,1002,"Wang",89.5,1004,"Fun",90};    char c[50];   //用户定义的字符数组    ostrstream strout1(c,30);   //建立输出字符串流，与数组c建立关联，缓冲区长30    for(int i=0; i<3; i++)     //向字符数组c写3个学生的数据        strout1<<stud[i].num<<stud[i].name<<stud[i].score;    strout1<<ends;              //ends是C++的I/O操作符，插入一个′\\0′    cout<<"array c:"<<c<<endl;    //显示字符数组c中的字符    ostrstream strout2(c,40);  //这时，c将被重写    for(int i=0; i<3; i++)        strout2<<stud[i].num<<" "<<stud[i].name<<" "<<stud[i].score<<" ";    strout2<<ends;              //ends是C++的I/O操作符，插入一个′\\0′    cout<<"array c:"<<c<<endl;    //显示字符数组c中的字符    return 0;}

以字符串流为中介交换数据

#include <strstream>#include<iostream>using namespace std;int main( ){    char c[50]="12 34 65 -23 -32 33 61 99 321 32";    int a[10],i,j,t;    cout<<"array c:"<<c<<endl;//显示字符数组中的字符串    istrstream strin(c,sizeof(c));    //建立输入串流对象strin并与字符数组c关联    for(i=0; i<10; i++)        strin>>a[i];                     //从字符数组c读入10个整数赋给整型数组a    cout<<"array a:";    for(i=0; i<10; i++)        cout<<a[i]<<" ";                 //显示整型数组a各元素    cout<<endl;    for(i=0; i<9; i++)                 //用起泡法对数组a排序        for(j=0; j<9-i; j++)            if(a[j]>a[j+1])            {                t=a[j];                a[j]=a[j+1];                a[j+1]=t;            }    ostrstream strout(c,sizeof(c));    //建立输出串流对象strout并与字符数组c关联    for(i=0; i<10; i++)        strout<<a[i]<<" ";               //将10个整数存放在字符数组c    strout<<ends;                      //加入′\\0′    cout<<"array c:"<<c<<endl;         //显示字符数组c    return 0;}