Question

Where Did I Go Wrong?

Asked by: Noo2this

The below is the warning I get when I try to debug inputs to my program:
warning C4996: 'scanf' was declared deprecated

It refers to this string:  scanf(" %c%c%c", &first, &second, &third);

I cannot figure out what is wrong.  Can anyone help?

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Asked On
2008-10-10 at 20:51:23ID23806032
Tags

C

,

Visual Studio 2005

,

warning C4996: 'scanf' was declared deprecated

Topics

Management & Debugging Software

,

C / C++ / C# Editors and IDEs

Participating Experts
2
Points
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Comments
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Answers

 

by: StrongBad_RulesPosted on 2008-10-10 at 21:23:31ID: 22692679

Could you put the whole code on here or at least the declarations?

 

by: Noo2thisPosted on 2008-10-10 at 21:30:04ID: 22692689

int
main(void)
{
char first, second, third; /* input - first 3 letters of your name */
int yard_length, house_length; /* input - yard and house length */
int yard_width, house_width; /* input - yard and house width */
int grass_area; /* output - what you are working with */
int time_required; /* output - time required to cut the grass */
 
/* Get and display the customer's name. */
printf("Type in first 3 letters of your name and press return> ");
scanf(" %c%c%c", &first, &second, &third);
printf("Hello %c%c%c, let's see how big your yard is.\n", first, second, third);
	

                                              
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by: ThejakaPosted on 2008-10-10 at 22:52:44ID: 22692854

This is a microsoft CRT related warning. You can use

#pragma warning(disable:4996)

to disable the warning, then

#pragma warning(default:4996)

to reset it. Use before, after main method, respectively.

Alternately, try a later Microsoft CRT, or an alternate CRT.

Also, you can use scanf_s instead:
http://msdn.microsoft.com/en-us/library/w40768et(VS.80).aspx

 

by: Noo2thisPosted on 2008-10-11 at 05:44:29ID: 22693717

Thejaka,

I used scanf_s and it gave me access violations.  I'm new to this visual studio so where exactly do I put the #pragma warning(disable:4996) in my program?

 

by: ThejakaPosted on 2008-10-11 at 07:06:04ID: 22693953

The access violations may have been caused by your compile/link options. Try dynamically linking to CRT by selecting "Multithreaded DLL" build option and linking with msvcp, msvcrt libraries.

For the other, try like this:

#pragma warning(disable:4996)
int main(void)
{
  // Some code...
}
#pragma warning(default:4996)
                                              
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by: ThejakaPosted on 2008-10-11 at 07:16:29ID: 22693974

Regarding the access violation:

In case you didn't check the msdn link, note the following excerpt:

==========

Unlike scanf and wscanf, scanf_s and wscanf_s require the buffer size to be specified for all input parameters of type c, C, s, S, or [. The buffer size is passed as an additional parameter immediately following the pointer to the buffer or variable. For example, if reading a string, the buffer size for that string is passed as follows:

char s[10];

scanf_s("%9s", s, 10);

The buffer size includes the terminating null. A width specification field may be used to ensure that the token read in will fit into the buffer. If no width specification field is used, and the token read is too big to fit in the buffer, nothing will be written to that buffer.

==========

Your line of code could be written as follows:

scanf_s(" %c%c%c", &first, 1, &second, 1, &third, 1);
                                              
1:

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by: Noo2thisPosted on 2008-10-12 at 09:38:25ID: 31505250

Thejaka, thanks.

20120131-EE-VQP-002

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