For-loop from C to Delphi

[DeddyH]

I am not very familiar with C, but I think ctoi means "character to integer", which is Ord() in Delphi. There is also a function called atoi which means "ASCII to integer" (Delphi: StringToInt). Both return different results. In my opinion Ord() is the right function for your purpose.

[WojTec]

Thare are these functions:

Code:

int ctoi(char source)
{ /* Converts a character 0-9 to its equivalent integer value */
   if((source >= '0') && (source <= '9'))
      return (source - '0');
   return(source - 'A' + 10);
}

char itoc(int source)
{ /* Converts an integer value to its hexadecimal character */
   if ((source >= 0) && (source <= 9)) {
      return ('0' + source); }
   else {
      return ('A' + (source - 10)); }
}

StrToInt working. But I'm still confused, what difference between ctoi() and atoi() if char in C is byte? You told C.atoi() = Delphi.StrToInt(), the same doing ctoi()?

Code:

s = "C++";
i = atoi(s[0]);
i = ctoi(s[0]);
i = s[0];

What values are assigned to i in these cases?

Delphi-Quellcode:

s = 'C++';
i = Ord(s[0]);
i = StrToInt(s[0]);
i = Ord(s[0]);

?

[Union]

Delphi-Quellcode:

StrCopy(s, 'C++');
i := Ord(s[0]); -> 67
i := StrToInt(s[0]); -> Invalid since 'C' is no number

[Medium]

More importantly: When working with Delphi Strings, keep in mind that their index starts with 1! If you have an array of char, the first index is zero though.

[DeddyH]

As shown in #4

[Medium]

Easy to forget, since Union seemed to use a zero base on Strings, which can lead to quite some confusion - I know that first hand, since I regularly forget it myself. But you're right of course

[Union]

Yes this was for PChar (see StrCopy). But the principle was to show the StrToInt() and Ord() function's results.