so in python you can split strings like this:
string = "Hello world!"
str1 , str2 = string.split(" ")
print(str1);print(str2)
and it prints:
Hello
world!
How can i do the same in C++? This wasn't useful Parse (split) a string in C++ using string delimiter (standard C++) , i need them splited so i can acces them separatedly like print just str1 for example.
If your tokenizer is always a white space (" ") and you might not tokenize the string with other characters (e.g. s.split(',')), you can use string stream:
#include <iostream>
#include <string>
#include <sstream>
int main() {
std::string my_string = " Hello world! ";
std::string str1, str2;
std::stringstream s(my_string);
s>>str1>>str2;
std::cout<<str1<<std::endl;
std::cout<<str2<<std::endl;
return 0;
}
Keep in mind that this code is only suggested for whitespace tokens and might not be scalable if you have many tokens. Output:
Hello
World!
std::string only
strtok as a more general answer?!strtok may well form a more general answer but I like the specificity of this answer plus the fact that strtok is a scaled-down version of the devil.
stringstream header. It should be sstream.You could create your own splitString function. Here is an example:
std::vector<std::string> splitString(std::string str, char splitter){
std::vector<std::string> result;
std::string current = "";
for(int i = 0; i < str.size(); i++){
if(str[i] == splitter){
if(current != ""){
result.push_back(current);
current = "";
}
continue;
}
current += str[i];
}
if(current.size() != 0)
result.push_back(current);
return result;
}
And here is an example usage:
int main(){
vector<string> result = splitString("This is an example", ' ');
for(int i = 0; i < result.size(); i++)
cout << result[i] << endl;
return 0;
}
Or how you want to use it:
int main(){
vector<string> result = splitString("Hello world!", ' ');
string str1 = result[0];
string str2 = result[1];
cout << str1 << endl;
cout << str2 << endl;
return 0;
}
Using boost:
#include <iostream>
#include <boost/algorithm/string.hpp>
#include <vector>
int main()
{
std::string line;
while(std::getline(std::cin, line)) {
std::vector<std::string> v;
boost::split(v, line, boost::is_any_of(" "));
for (const auto& s : v) {
std::cout << s << " - ";
}
std::cout << '\n';
}
return 0;
}
Here is my implementation for std::string_view (no need to make allocations and copy memory)
std::vector<std::string_view> splitString(const char* str, char delimiter)
{
const char* begin = str;
const char* cur = str;
std::vector<std::string_view> result;
for (; *cur; ++cur)
{
if (*cur == delimiter)
{
if (cur > begin)
{
result.emplace_back(std::string_view(begin, cur));
}
begin = cur + 1;
}
}
if (cur > begin)
{
result.emplace_back(std::string_view(begin, cur));
}
return result;
}
Note: before C++20 use
result.emplace_back(std::string_view(begin, static_cast<size_t>(std::distance(begin, cur))));
#include<bits/stdc++.h>
using namespace std;
int main(){
string str ="123/43+2342/23432";
size_t found = str.find("+");
int b=found;
int a,c;
size_t found1 = str.find("/");
if(found1!=string::npos){
a = found1;
}
found1 = str.find("/",found1+1);
if(found1!=string::npos){
c = found1;
}
string tmp1 = str.substr(0,a-0);
int num1 = stoi(tmp1);
tmp1 = str.substr(a+1,b-a-1);
int del1 = stoi(tmp1);
tmp1 = str.substr(b+1,c-b-1);
int num2 = stoi(tmp1);
tmp1 = str.substr(c+1);
int del2 = stoi(tmp1);
cout<<num1<<" "<<del1<<" "<<num2<<" "<<del2<<endl;
return 0;
}
Split all the number given in the string when you find "/" or "+" .
str1 , str2notation you'd have to do something really clever with your own class and an overloaded expression separator operator and assignment operator.