Problem with strncat() function (newbie)

**Kettch** · 12-07-2001

In my search to create a program to convert C++ strings into C chars, I came across this funtion.

Code:

char *strncat(char *string1, char *string2, size_t n) - Append n characters from string2 to stringl.

Here's what I had so far. This generates quite a few compile errors, and I'm not quite sure what I'm doing wrong, as although I'm a newb in C++, I know almost no C :0

Code:

#include <iostream.h>
#include <stdlib.h>
#include <lvp\string.h>

char StringToChar(String StringWord)
{

  char CharWord[50], AddOnChar;
  String OneLetterString;
  int Size, Counter;
  Size = StringWord.length();
  if (Size <= 50) {
    for (Counter = 1; Counter <= Size; Counter++) {
      OneLetterString = StringWord.substr(Counter,1);

      if (OneLetterString == "A")
        AddOnChar = 'A';
      else if (OneLetterString == "B")
        AddOnChar = 'B';
      else if (OneLetterString == "C")
        AddOnChar = 'C';
      else if (OneLetterString == "D")
        AddOnChar = 'D';
      else if (OneLetterString == "E")
        AddOnChar = 'E';
      else if (OneLetterString == "F")
        AddOnChar = 'F';
      else if (OneLetterString == "G")
        AddOnChar = 'G';
      else if (OneLetterString == "H")
        AddOnChar = 'H';
      else if (OneLetterString == "I")
        AddOnChar = 'I';
      else if (OneLetterString == "J")
        AddOnChar = 'J';
      else if (OneLetterString == "K")
        AddOnChar = 'K';
      else if (OneLetterString == "L")
        AddOnChar = 'L';
      else if (OneLetterString == "M")
        AddOnChar = 'M';
      else if (OneLetterString == "N")
        AddOnChar = 'N';
      else if (OneLetterString == "O")
        AddOnChar = 'O';
      else if (OneLetterString == "P")
        AddOnChar = 'P';
      else if (OneLetterString == "Q")
        AddOnChar = 'Q';
      else if (OneLetterString == "R")
        AddOnChar = 'R';
      else if (OneLetterString == "S")
        AddOnChar = 'S';
      else if (OneLetterString == "T")
        AddOnChar = 'T';
      else if (OneLetterString == "U")
        AddOnChar = 'U';
      else if (OneLetterString == "V")
        AddOnChar = 'V';
      else if (OneLetterString == "W")
        AddOnChar = 'W';
      else if (OneLetterString == "X")
        AddOnChar = 'X';
      else if (OneLetterString == "Y")
        AddOnChar = 'Y';
      else if (OneLetterString == "Z")
        AddOnChar = 'Z';
      else if (OneLetterString == "a")
        AddOnChar = 'a';
      else if (OneLetterString == "b")
        AddOnChar = 'b';
      else if (OneLetterString == "c")
        AddOnChar = 'c';
      else if (OneLetterString == "d")
        AddOnChar = 'd';
      else if (OneLetterString == "e")
        AddOnChar = 'e';
      else if (OneLetterString == "f")
        AddOnChar = 'f';
      else if (OneLetterString == "g")
        AddOnChar = 'g';
      else if (OneLetterString == "h")
        AddOnChar = 'h';
      else if (OneLetterString == "i")
        AddOnChar = 'i';
      else if (OneLetterString == "j")
        AddOnChar = 'j';
      else if (OneLetterString == "k")
        AddOnChar = 'k';
      else if (OneLetterString == "l")
        AddOnChar = 'l';
      else if (OneLetterString == "m")
        AddOnChar = 'm';
      else if (OneLetterString == "n")
        AddOnChar = 'n';
      else if (OneLetterString == "o")
        AddOnChar = 'o';
      else if (OneLetterString == "p")
        AddOnChar = 'p';
      else if (OneLetterString == "q")
        AddOnChar = 'q';
      else if (OneLetterString == "r")
        AddOnChar = 'r';
      else if (OneLetterString == "s")
        AddOnChar = 's';
      else if (OneLetterString == "t")
        AddOnChar = 't';
      else if (OneLetterString == "u")
        AddOnChar = 'u';
      else if (OneLetterString == "v")
        AddOnChar = 'v';
      else if (OneLetterString == "w")
        AddOnChar = 'w';
      else if (OneLetterString == "x")
        AddOnChar = 'x';
      else if (OneLetterString == "y")
        AddOnChar = 'y';
      else if (OneLetterString == "z")
        AddOnChar = 'z';
    }
    *strncat(*CharWord, *AddOnChar, 1);
    //CharWord+=AddOnChar;
    cout << CharWord << endl;
  }
  cout << "Complete";
  getch();
  return(*CharWord);
}

Any help would be appreciated

--Kettch

**Strider** · 12-07-2001

Why are you making the task so lengthy? You are using the string.h header from the lvp library. This file is similar to what is used for Visual C++ strings in that it incorporates a c_str() function to handle such a conversion for you. Here is what I mean.

Code:

// using Dev-C++ 4.01
#include <stdio.h>
#include <stdlib.h>
#include <lvp/string.h>

int main(int argc, char *argv[])
{
    String MyString = "My Name is Bubba";
    char MyChar[50];
    strcpy(MyChar, MyString.c_str());
    cout << MyChar << endl;

    return 0;
}

There is not much else to it.

David

**Kettch** · 12-08-2001

Thanks!! I'm fairly new to C/C++ and I haven't fully explored the libraries.. this was all I could come up with on my own :0

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