Talk:Comparison of programming languages (string functions)

C function toupper() in UpperCase

This is misleading in the article. C doesn't have a function to uppercase a whole string. toupper() takes and returns an integer as its arguments, NOT strings. It's prototype:

int toupper(int c);

If c is a lowercase letter (a-z), topupper() returns the uppercase version (A-Z). Otherwise toupper() returns c unchanged. toupper() does not convert international characters (those with ASCII codes over 0x80), like ă or ç. To uppercase a whole string you need to write a function something like this:

include <ctype.h> //standard C header file with the prototype of toupper()

void UpperCaseAString(char *theString)//string is a pointer to the first char of the string you want to uppercase.

{ char *myCharPtr = theString;//myCharPtr is a pointer to char - innitialize it to theString

while(*myCharPtr != '\0')//C uses-null terminated strings. *is what's pointed to by myCharPtr

   {
   *myCharPtr = toupper(*myCharPtr);
   myCharPtr ++; //myCharPtr is a pointer to type char so it will be incremented by sizeof(char).
   }

}

In C strings are essentially pointers to a character and they end where there is a NULL ('\0') character. It would be worthwhile to explain what strings are in different languages.Senor Cuete (talk) 03:41, 10 May 2008 (UTC)Senor Cuete[reply]

The 1. should appear as a pound sign and the box is put there by Wiki's text engine. I didn't type it like that.Senor Cuete (talk) 03:44, 10 May 2008 (UTC)Senor Cuete[reply]