how to remove special characters from a string
#include <iostream>
#include <string>
#include <cctype>
int main() {
std::string str = "Hello, World! This is a string with special characters.";
for (int i = 0; i < str.size(); i++) {
if (std::isalnum(str[i]) || str[i] == ' ') {
std::cout << str[i];
}
}
return 0;
}