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]

The <source lang="...">...</source> tag should fix it. Ghettoblaster (talk) 12:43, 10 May 2008 (UTC)[reply]

Compare (integer result, fast/non-human ordering)

In the table row for C, why would you go through the hassle of writing your own function when you could call the C function strncmp?

#include <string.h>

int strncmp(const char *s1, const char *s2, size_t n);

Senor Cuete (talk) 00:52, 16 May 2008 (UTC)Senor Cuete[reply]

substring

Shouldn't the table row for C just mention the C function strncpy?

#include <string.h>

char *strncpy(char *s1, const char *s2, size_t n);

Why concatenate when you can copy? —Preceding unsigned comment added by Senor Cuete (talk • contribs) 00:50, 16 May 2008 (UTC)[reply]