scanf_s i scanf (Programiranje) @ Bug.hr Forum

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sub 16.10.2010 19:54

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scanfovi

koja je razlika?za scanf u vsu dobivam upozorenja o nesigurnosti...

<<Karlovačko>>

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sub 16.10.2010 21:37

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RE: scanfovi

Pa sam kompajler ti je da odgovor :P scanf_s je sigurniji od scanf

Da nepisen bzvz evo copy paste

char name[10]; //declares an array that can hold 10 characters

scanf("%s", name); //gets a string from the user and puts it in name

this will work fine if the user's name is rick or something smaller than 9 characters (9 because the last character is a terminator), but if the user's name is 10 or more characters, scanf starts writing into memory that doesn't belong to name. C won't catch this or warn you, so you won't find out until something else tries to use that memory and your program crashes.

Because this is such a common issue, scanf_s checks that the user input will fit in the given memory space, so many problems are avoided.

Poruka je uređivana zadnji put sub 16.10.2010 21:41 (Orinem).

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sub 16.10.2010 21:39

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RE: scanfovi

Navod :

"Basically scanf_s is more secure. C does no type checking for you, so when you use scanf, C doesn't make sure that what the user inputs will fit in the variable that you've designated. For example, if you use this code,

char name[10]; //declares an array that can hold 10 characters
scanf("%s", name); //gets a string from the user and puts it in name

this will work fine if the user's name is rick or something smaller than 9 characters (9 because the last character is a terminator), but if the user's name is 10 or more characters, scanf starts writing into memory that doesn't belong to name. C won't catch this or warn you, so you won't find out until something else tries to use that memory and your program crashes.

Because this is such a common issue, scanf_s checks that the user input will fit in the given memory space, so many problems are avoided.

"

Eto zašto :)

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sub 16.10.2010 21:42

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RE: scanfovi

Private kaže...

Navod :

"Basically scanf_s is more secure. C does no type checking for you, so when you use scanf, C doesn't make sure that what the user inputs will fit in the variable that you've designated. For example, if you use this code,

char name[10]; //declares an array that can hold 10 characters
scanf("%s", name); //gets a string from the user and puts it in name

this will work fine if the user's name is rick or something smaller than 9 characters (9 because the last character is a terminator), but if the user's name is 10 or more characters, scanf starts writing into memory that doesn't belong to name. C won't catch this or warn you, so you won't find out until something else tries to use that memory and your program crashes.

Because this is such a common issue, scanf_s checks that the user input will fit in the given memory space, so many problems are avoided.

"

Eto zašto :)

DOk san ja edit posta si isti tekst

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sub 16.10.2010 21:42

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RE: scanfovi

yep :)))

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ned 17.10.2010 1:39

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scanf_s i scanf

lol
Hvala :D

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