Canonicalizing the case of a word entered by the user

Question

I am building a console bot. There is a way to specify the gender of the user there. Now if the user gives the command !setgender then the gender of the user will be asked by the bot. My question is the user can enter male, Male, mAle, maLe, malE ,mALE or any form of "male" the user wants (same goes for female and other gender). How can I get any form of "male" (or female, or other) and set the gender to Male (or female or other)?

Why not? Once you case-fold the input to all-lowercase `"male"` you can compare against it. — Botje, Oct 21 '20 at 08:06
What is stopping you? `/* use linked answer to make data lowercase */ if (data == "male") data = "Male";` Done. StackOverflow is not a code writing service, you're still supposed to think for yourself. — Botje, Oct 21 '20 at 08:12
Yeah, I was thinking about that. Currently i am implementing it. Let's see it works or not, I will notify you in 10 mins — Rid, Oct 21 '20 at 08:14
Yeah it worked! I implemented the first answer of this question! Thanks for your help too — Rid, Oct 21 '20 at 08:35
FahimFuad: So, you chose to go with lower-casing the string like @Botje suggested. In that case - this question is a dupe as suggested earlier. — einpoklum, Oct 21 '20 at 08:48

463035818_is_not_an_ai · Accepted Answer · 2020-10-21T11:17:51.787

3

Transform the input to all lowercase, then the only valid input is "male" (shamelessly copied and adopted from here):

#include <algorithm>
#include <cctype>
#include <string>
#include <iostream>


std::string data;
std::cin >> data;
std::transform(data.begin(), data.end(), data.begin(),
    [](unsigned char c){ return std::tolower(c); });
if (data == "male") {
    data = "M41e"; // whatever you like to have as the "correct" spelling
}

edited Oct 21 '20 at 11:17

answered Oct 21 '20 at 08:02

463035818_is_not_an_ai

109,796
11
89
185

Thanks! It worked. I didn't knew about the `std::transform` now I will learn about that! Thanks again for your help! – Rid Oct 21 '20 at 08:34
@FahumFuad `std::transform` is not the crucial part, `std::tolower` is – 463035818_is_not_an_ai Oct 21 '20 at 08:35
Yeah, thanks. I will learn both! – Rid Oct 21 '20 at 08:37

Nitin Singla · Answer 2 · 2020-10-21T08:37:42.537

0

Reference

#include <cctype>
#include <iostream>
#include <string>
bool caseInSensStringCompare(const std::string &str1, const std::string str2)
{
    return ((str1.size() == str2.size()) &&
            std::equal(str1.begin(), str1.end(), str2.begin(), [](char c1, char c2) {
                return (c1 == c2 || std::toupper(c1) == std::toupper(c2));
            }));
}

int main()
{
    std::string gender;
    std::cin >> gender;
    if (caseInSensStringCompare(gender, "male"))
    {
        // ...
    }
}

edited Oct 21 '20 at 08:37

answered Oct 21 '20 at 08:15

Nitin Singla

106
2
9

1

While it works, that function should probably take its arguments as const reference, and the lambda should just take chars instead of references to chars. – Botje Oct 21 '20 at 08:26
@Botje - Thanks to your tips, updated the answer :) – Nitin Singla Oct 21 '20 at 08:35

Canonicalizing the case of a word entered by the user

2 Answers2