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#include <iostream>
#include <sstream> //istringstream 必须包含这个头文件
#include <string>
using namespace std;
int main() {
string source = "i an a boy";
// 声明一个字符串输入流
istringstream sin;
// 将字符串导入到sin输入流中
sin.str(source);
// 分离的方法1
string s;
while (sin >> s) {
cout << s << endl;
}
cout << "===============================" << endl;
// 重复使用必须先清空
sin.clear();
// 重新加载，准备二次输入，或者sin的重用
string a, b, c, d;
sin >> a >> b >> c >> d;
cout << a << endl;
cout << b << endl;
cout << c << endl;
cout << d << endl;
return 0;
