rotating punctuation marks

[mpvick]

how would I find punctuation string and then if there is punctuation d move it to the end of a string?

[H00G0]

You can do that simply with string operations
std::string::find : http://www.cplusplus.com/reference/string/string/find/
std::string::erase : http://www.cplusplus.com/reference/string/string/erase/
std::string::append : http://www.cplusplus.com/reference/string/string/append/

Keep in mind that to append you can also do this:

string str = "something";

//appending 's' to str
str.append("s");
//or the following does the same
str += "s";

[mpvick]

Would it work the same for an input file such as an unknown string length and unknown punctuation mark?

[H00G0]

>Would it work the same for an input file such as an unknown string length

Well yes, you would just need an extra step before trying to search a string for a char.
_first you read the file and store the stream in a string
_then you can start doing operations on your string


>Would it work the same for an input file such as [...] unknown punctuation mark?

No, when you want to find a string within a string you have to specify what you're looking for. As far as I know there is not way of telling whether a string contains punctuation within it other than by manually doing it.

However if you #include <cctype> you can use the function std::ispunct but it takes a char as argument, so I guess you'd have to manually check every char of your string.

std::ispunct : https://en.cppreference.com/w/cpp/string/byte/ispunct

[mpvick]

ah thank you, so, what I'm doing is a piglatin translator i figure based on what you said if i first, translate the input into pig latin then create two strings that are before and after the punctuation mark id be left with a string that doesnt have the punctuation but could I save a third string using the find function that saves that character as a string and then essentially add it to the end of the combination of the other two string?

[H00G0]

I don't quite understand what you mean, Could you provide an example, not necessarily code, of what you're trying to achieve. With your initial string, then after translation etc?

[mpvick]

how would i create a string of just the found character?

[H00G0]

If you mean when you look for a punctuation char and find it, then
_if at position n your string has a punctuation char,
_you can create a substring aka 'extract' the char and store it in another string ( see http://www.cplusplus.com/reference/string/string/substr/)
_then append that string to your final string which will hold all punctuation marks you've come across

[mpvick]

how way off might this be?

#include <fstream>
#include <cstring>
#include <string>
#include <cctype>
using namespace std;

bool IsPeriod(char letter)
 {

    switch (letter)
    {
    case '.':
        return true;
    }
    return false;
 }
bool IsComma(char letter)
{
    switch (letter)
    {
    case ',':
        return true;
    }
    return false;
}
bool IsVowel(char letter)
{
    switch (letter)
    {
    case 'A': case 'E': case 'I': case 'O': case 'U': //case 'Y':
    case 'a': case 'e': case 'i': case 'o': case 'u': //case 'y':
        return true;
    }
    return false;
}

string PigLatin(const char *word)
{
    string s(word);
    if (IsVowel(word[0]))
        s = s + "way";
    else
        s = s.substr(1) + s[0] + "ay";

    return s;
}

string Punctuation(string *PigLatin)
{

  string t(PigLatin);
    if (IsPeriod(PigLatin[i]))
   int i
   char chars[] = ".";

   for (unsigned int i = 0; i < tlen(chars); ++i)
   {
   
      t.erase (std::remove(t.begin(), t.end(), chars[i]), t.end());
   }

   
   t= t + ".";
   else if (IsComma(PigLatin[i]))

   char chars[] = ",";

   for (unsigned int i = 0; i < tlen(chars); ++i)
   {
       t.erase (std::remove(t.begin(), t.end(), chars[i]), t.end());
   }
   t= t + ",";

   else

   t=t;

   return t;
}

int main()
{
    const char *delims = " \"";

    ifstream fin("pigLatinFilein.txt");
    ofstream fout("pigLatinFileout.txt");

    char sentence[10000];
    fin.getline(sentence, sizeof sentence);

    char *word = strtok(sentence, delims);
    while (word)
    {
        fout << Punctuation(PigLatin) << " ";
        word = strtok(NULL, delims);
    }
    fout << '\n';
}

[H00G0]

Let's start little by little.

For your first three functions:

IsPeriod function:

bool IsPeriod(char letter)
 {
    if (letter == '.')
        return true;
    else
        return false;
 }

Switches are only ever useful when you have many statements, surely not one.

IsComma function:

bool IsComma(char letter)
{
    if (letter == ',')
        return true;
    else
        return false;
}

IsVowel function:

bool IsVowel(char letter)
{
    letter = toupper(letter);
    
    switch (letter)
    {
        case 'A':
            return true;
            break;
        case 'E':
            return true;
            break;
        case 'I':
            return true;
            break;
        case 'O':
            return true;
            break;
        case 'U':
            return true;
            break;
        default:
            return false;
    };
}

Here a switch is ok, also check how to use switches, you need break statements for each cases

For the rest of your code, I have a few questions / comments:
_Why do you want to use cstrings instead of strings?
_Instead of reading the whole file and cutting it down, which looks like a pain, why don't you just read a line, then deal with that line and only after, read the second line and repeat?
_What exactly is your pigLatin function supposed to do?
_What are you trying to do with the punctuation?