Usage of stringstream

1. use stringstream To split the specified character string , The code is as follows ：

// use stringstream To split the specified character string 
#include <iostream>
#include <sstream>
#include <vector>
#include<queue>
#include<string>

using namespace std;

int main() {
    
    string str = "1,2,3,4,5";
    stringstream ss(str);
    string item;
    queue<string> q;
    cout << str << endl;
    while(getline(ss, item, ','))
        cout << item << ' ';
    return 0;
}

Running results ：

2. String splicing , The code is as follows ：

//stringstream For string splicing 
#include <iostream>
#include <sstream>
#include <string>
using namespace std;
#include<sstream>
int main()
{
    
	stringstream sstream;
	//  Put multiple strings into  sstream  in 
	sstream << "first" << " " << "second";
	sstream << " third times";
	cout << " Output string : " << sstream.str() << endl;
	//  Empty  sstream
	sstream.str("");
	sstream << "one more time";
	cout << " After emptying the string , Output is : " << sstream.str() << endl;
	return 0;
}

Running results ：

3. Format numeric type data as a string , The code is as follows ：

//stringstream Format numeric type data as a string 
#include <iostream>
#include <sstream>
#include <string>
using namespace std;
#include<sstream>
int main()
{
    
	int a = 865;
	string sa;
	//  Convert an integer variable to a string , Store in string The class object 
	stringstream s;
	s << a;
	s >> sa;
	string strValue1;
	strValue1 = s.str();
	cout << strValue1 << endl;
	//  take stringstream Bottom management string Object set to "",  Otherwise, when converting multiple times , Will accumulate all the results at the bottom string In the object 
	s.str("");
	s.clear();//  Empty s,  If you don't empty it, the conversion will fail 
	double d = 12.34;
	s << d;
	s >> sa;
	string strValue2;
	// This method will manage the whole string Object returns , Not read / Effect of write pointer 
	strValue2 = s.str();// str() Method ： return stringsteam In the management of string type 
	cout << strValue2 << endl;
	return 0;
}

Running results ：