Question

How to remove punctuation from a string and lowercase the string in C++

Answer 1

#include <iostream>
#include <algorithm>

std::string toLower(std::string str) {
    for_each(str.begin(), str.end(), [](char & ch) {
        ch = tolower(ch);
    });
       
    return str;
}
 
std::string removePunctuationAndLowercaseString(const std::string& str) {
    std::string tmp(str);
    
    tmp.erase(std::remove_if(tmp.begin(), tmp.end(), ispunct), tmp.end());
     
    return toLower(tmp);
}
 
int main() {
    std::string str = "CPP is, a &general (purpose) @PROGRAMMING <language>.";
 
    str = removePunctuationAndLowercaseString(str);
     
    std::cout << str;
}

 
 
/*
run:
 
cpp is a general purpose programming language
 
*/
 

 

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Answer 2

#include <iostream>
#include <algorithm>

std::string toLower(std::string str) {
    transform(str.begin(), str.end(), str.begin(), ::tolower);
       
    return str;
}
 
std::string removePunctuationAndLowercaseString(const std::string& str) {
    std::string tmp(str);
    
    tmp.erase(std::remove_if(tmp.begin(), tmp.end(), ispunct), tmp.end());
     
    return toLower(tmp);
}
 
int main() {
    std::string str = "CPP is, a &general (purpose) @PROGRAMMING <language>.";
 
    str = removePunctuationAndLowercaseString(str);
     
    std::cout << str;
}

 
 
/*
run:
 
cpp is a general purpose programming language
 
*/
 

 

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