username password

How would i go about changing a string to uppercase, no matter what case the characters are entered in the program??


Also how would i go about creating a username and password function?

THanks.

tolower() and toupper() ignores the case as far as I know.

Creating username and passwd: Which plattform, *nix or Windows ? In Unix you could prepare a string and use system() for it, which'd be the easiest way

I'm using dev c++ on windows.

Where would i put the toupper?

Here is just a simple function I wrote:

Code:

---

void convertToUppercase(char *sPtr)
{
    while (*sPtr != '\0') { // current character is not '\0'

          if(islower(*sPtr)) { //if character is lowercase
              *sPtr = toupper(*sPtr); //convert to uppercase
          }
      ++sPtr //move sPtr (pointer to the next character
    } //end while
} //end function convertToUppercase

---

:)

>How would i go about changing a string to uppercase, no matter what case the characters are entered in the program??
toupper in <ctype.h>.

>if(islower(*sPtr))
This test is not needed anymore for a simple case switch. toupper is guaranteed to return its argument unchanged if there is no suitable conversion. So your function could be simplified even more (with my own embellishments):

Code:

---

char *stoupper ( char *s )
{
  while ( *s != '\0' )
    *s++ = toupper ( *s );
}

---

Code:

---

(/* DISPLAY DESIGNER NAMES */
void f_display_designer ()
{
        int num_i;
    num_of_items_i1 = 1;



printf("______________________________________\n");
printf("DESIGNER INFORMAION\n");
printf("_______________________________________\n");
printf("\n");

                  for (num_i = 0; num_i < num_of_items_i1; num_i ++);
                {
                printf ("%s    %s  %s    %s \n", designer[num_i].forename_s, designer[num_i].surname_s, designer[num_i].mobile_number_s, designer[num_i].area_s );

       
                printf("__________________________________\n\n\n\n\n");
                }

---

thats an example of my display code where would i add the peice of code?

If you want all output in upper case:

Code:

---

printf ("%s    %s  %s    %s \n",
  stoupper ( designer[num_i].forename_s ),
  stoupper ( designer[num_i].surname_s ),
  designer[num_i].mobile_number_s,
  designer[num_i].area_s );

---

Do i not need this part >>>

Code:

---

char *stoupper ( char *s )
{
  while ( *s != '\0' )
    *s++ = toupper ( *s );
}

---

??

of course you do

Great, where do i put it?

In the C Standard library, there are functions strupr() and strlwr() that convert strings to all-upper or all-lower case. The conversion is in-place (it modifies the original string).

Why not try one of these?

Code:

---

#include <stdio.h>
#include <string.h>

int main()
{
  char string1[] = "This is string #1";
  char string2[] = "This is string #2";
  char string3[] = "This is string #3";

  printf("Initial Strings:        <%s> <%s> <%s> \n\n",
          string1, string2, string3);

  printf("Strings using functions: <%s> <%s> <%s> \n\n",
          strupr(string1), strlwr(string2), string3);

  printf("Strings after functions: <%s> <%s> <%s> \n",
          string1, string2, string3);

  return 0;
}

---

Dave

On the top, before int main(), or you can take it at the boun, and make a prototype at the global declare place, where you include headers/libaries etc.. Should look like this:
char *stoupper(char *s); //prototype
Then you can use it as much you want ;)

Cheers Dave that works a treat.

>Why not try one of these?
Because despite being in string.h on your compiler, they actually are not a part of the standard library.

Quote:

---

Originally posted by Prelude
>Why not try one of these?
Because despite being in string.h on your compiler, they actually are not a part of the standard library.

---

[edit]

Oops: now I see: string.h is in the standard; not strupr(), strlwr().
(But they are in Borland, Microsoft VC++, GNU gcc libraries, and I've used them from time to time).

Apologies, and thanks for the information
[/edit]
Dave