How to Split strings in C++

Sometimes we need to split a string into multiple substrings based on a delimiter. C++ provides several ways to accomplish this task.

Syntax

#include <string>
#include <sstream>

using namespace std;

string input = "this-is-a-test-string";

stringstream ss(input);
string part;
while (getline(ss, part, '-')) {
    // do something with each part
}

In the above example, we define a stringstream and initialize it with our string. We then use the getline function with a delimiter to extract each part of the string.

Example

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

int main() {
    string input = "this,is,a,test,string";
    vector<string> parts;

    stringstream ss(input);
    string part;
    while (getline(ss, part, ',')) {
        parts.push_back(part);
    }

    // print each part
    for (auto p : parts) {
        cout << p << endl;
    }

    return 0;
}

Output

this
is
a
test
string

Explanation

In the above example, we define a string called "input" that contains several substrings separated by commas. We then create a vector to store each substring.

We use a stringstream to extract each part of the string using the getline function. The second argument to getline is the delimiter, which in this case is a comma.

Each extracted part is added to the vector using the push_back function. Finally, we print each part of the vector to the console.

Use

Splitting strings can be useful in a variety of scenarios, such as parsing input from a user or reading data from a file.

Important Points

• C++ provides several ways to split strings, including using stringstreams and the strtok function.
• The getline function can be used to extract each part of a string based on a delimiter.
• The extracted parts can be stored in a vector or other container for further processing.

Summary

In summary, splitting strings in C++ can be accomplished using a variety of techniques. The stringstream and getline functions provide a simple and flexible way to extract each part of a string based on a delimiter.