stringstream的用法

#include <iostream> #include <fstream> #include <string> #include <sstream> using namespace std; int main() { ifstream infile1; infile1.open("d:\\test.txt"); string sLine, sWord; while (getline(infile1, sLine)) { istringstream iss(sLine); while (iss >> sWord) { //1.读取每一行的每个单词，并输出 cout<<sWord.c_str()<<endl; } } infile1.close(); //2.格式化输入输出 int val1 = 512, val2 = 1024; int val3, val4; ostringstream oss; oss<<"val1: "<<val1<<",val2: "<<val2;//要有空格符 string str; istringstream iss(oss.str()); iss>>str>>val3>>str>>val4; cout<<"val3:"<<val3<<",val4:"<<val4<<endl; //3.类型转换(再进行多次转换的时候，必须调用stringstream的成员函数clear()) string s1 = "1000"; int n1, n2; stringstream ss; ss<<s1; ss>>n1; ss.clear(); ss<<true; ss>>n2; cout<<n1<<", "<<n2<<endl; return 0; }