Solved

using strcpy in c++ error

Posted on 2011-03-21
7
393 Views
Last Modified: 2012-08-13
Can you please tell me what's wrong with this code?
I need to use strcpy for my homework and I keep getting a "Run-time check failure #2:Stack around st2 was corrupted"

btw, I am trying to just print State

Thanks guys!
#include<iostream>
#include<cstring>

using namespace std;

int main(){
	char st1[20]="State of Ca";
	char st2[5]={' '};

	strcpy(st2, st1);
	cout<<st2<<endl;
	
return 0;
}

Open in new window

0
Comment
Question by:pgmerLA
  • 3
  • 2
  • 2
7 Comments
 
LVL 8

Accepted Solution

by:
crysallus earned 300 total points
ID: 35185946
st2 is only 5 elements in size, which is too small to fit all of st1 in it. If you only want to copy part of the string, then use strncpy, where the third argument is the no. of char's to copy. Eg:

const int ST2_LEN = 5;
...
char st2[ST2_Len] = {' '};
strncpy(st2, st1, ST2_LEN);
...

Open in new window

0
 

Author Comment

by:pgmerLA
ID: 35185954
is there any way I could use strcpy?
0
 
LVL 8

Expert Comment

by:crysallus
ID: 35185967
strcpy always copies the whole of the source (st1), into the destination (st2), as such the destination must be at least as large as the source, including null-terminating character.

So, to copy only "State", or have the destination string smaller than the source, no.
0
PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

 
LVL 32

Assisted Solution

by:phoffric
phoffric earned 200 total points
ID: 35186107
BTW, if you want to store "state" as a c-style string in an array, then don't forget that you need a terminating null byte for a total of 6 bytes. Your st2 is only 5 bytes.
0
 
LVL 32

Expert Comment

by:phoffric
ID: 35186111
oops, crysallus, I didn't see that you said "including null-terminating character". So, never mind.
0
 
LVL 8

Expert Comment

by:crysallus
ID: 35186181
Actually, you were still kind of right to pick up on that, as I hadn't put 6 in my sample code in my first post, which I should have.

But yes, my explanation there probably should have got that across.
0
 

Author Comment

by:pgmerLA
ID: 35186453
Thanks guys.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Unlike C#, C++ doesn't have native support for sealing classes (so they cannot be sub-classed). At the cost of a virtual base class pointer it is possible to implement a pseudo sealing mechanism The trick is to virtually inherit from a base class…
Introduction This article is the first in a series of articles about the C/C++ Visual Studio Express debugger.  It provides a quick start guide in using the debugger. Part 2 focuses on additional topics in breakpoints.  Lastly, Part 3 focuses on th…
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.

803 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question