simpel person program in c

narius · 06-24-2002, 08:31 AM

Tja

I learning me c i use the book programing in ansi c.
but i´m not sure about scanf so i want to do a simpel program thats ask: name, age, hometown, street at hometown

i know i shold use tex printf("write you name\n");
then the scanf statement

crabboy · 06-24-2002, 11:09 AM

For educational proposes only. Never use code like this in non useless program.

Code:

#include <stdio.h>

struct Info
{
   char szName[50];
   int  iAge;
   char szAddress[50];
   char szCity[50];
}; 

main()
{
   struct Info stInfo;

   printf( "Gimmie your name: " );
   scanf( "%s",  stInfo.szName );

   printf( "Gimmie your age: " );
   scanf( "%d",  &stInfo.iAge );

   printf( "Gimmie your address: " );
   scanf( "%s", stInfo.szAddress );

   printf( "Gimmie your City: " );
   scanf( "%s", stInfo.szCity );

   printf( "Name: [%s], Age: [%d], Address: [%s], City: [%s]\n",
           stInfo.szName,
           stInfo.iAge,
           stInfo.szAddress,
           stInfo.szCity ); 

}

narius · 06-24-2002, 11:21 AM

pleas say what the different part are doing

narius · 06-24-2002, 11:25 AM

i tack the last message back.
but i have to ask.
why do i have only have "s" att the char variabel
and why char Name[50]; do i have 50 there

as i say befor i want to learn and you can´t learn if you doisent ask

crabboy · 06-24-2002, 12:52 PM

The "%s" arguement in scanf tells it to convert what it finds in the buffer to a string. The "%d" tells it to convert it to a decimal (int). the szName[50] creates an array of 50 characters. This will let you copy a string of up to 50 characters to it.

narius · 06-24-2002, 01:26 PM

thanx

Robert0380 · 06-26-2002, 01:06 PM

just as a security tip, i've been told that scanf is not safe and can cause buffer over flows (often used by hackers to root machines) and also never ever use gets()

Eits0 · 06-27-2002, 02:40 PM

Ooh! C++ seems simplier in this part!

Code:

printf( "Gimmie your name: " );
   scanf( "%s",  stInfo.szName );

instead of scanf, just use cin >> !!!

/Meh likes c++!!!

pmedes · 10-11-2003, 07:41 AM

I tried using the spider program in Sean Burke's "Perl and LWP" book
and, no matter what URL I start out with, I get a 500 message "URIs have
been disabled". Is this some sort of security issue?
Thanks,
Phil

pmedes · 10-11-2003, 07:54 AM

I found the 500 problem; it was just a typo.
Sorry!

Robert0380 · 10-16-2003, 03:17 PM

never use scanf, it's an insecure method (buffer overflow)

use fgets or cin, never ever ever ever use scanf if you care about the security of your programs.

darkseed2g3 · 10-16-2003, 11:34 PM

cin can be buffer overrun to caues it doesnt check for out of bounds unless done properly but most programmers arent very "proper" bout there code. I wish when ppl learned c/c++ or the jerks who wrote the books would teach more practical ways of programming.