How to remove certain characters from a string in C++?

In this section, we will see how to remove some characters from a string in C++. In C++ we can do this task very easily using erase() and remove() function. The remove function takes the starting and ending address of the string, and a character that will be removed.

// Input String = "Hello TutorialsPoint" Char = 'o' // Output String = "Hell TutrialsPint" 

Algorithm to Remove Certain Characters from a String

Here is the algorithm to remove certain characters from a string in C++:

Step 1: Take a string and a character to be removed as input. Step 2: Define erase function that takes remove function and the character as arguments. Step 3: Use the arguments of remove function to define the range of characters to be removed. (i.e., starting and ending address of the string) Step 4: Call the erase function to remove the character from the string. Step 5: Print the result. Step 6: End 

Example Code to Remove Certain Characters from a String

In this example, we will remove the character 'a' from the string "apple banana".

#include <iostream> #include <string> #include <algorithm> using namespace std; int main() { string str = "apple banana"; char charToRemove = 'a'; // Remove the character from the string str.erase(remove(str.begin(), str.end(), charToRemove), str.end()); cout << "Final string: " << str << endl; return 0; } 

The output of the above code will be:

Initial string: apple banana Final string: pple bnn