C - "Access violation writing location" when inputing string

[Matttaj69]

Hi,

I am working on a simple code in C, have got the logic almost sorted.

However, in order for my program to work, I need a user to input a string. I have tried <scanf_s("%s", potr);> (shown in picture), but while debugging, it has ended on that line with "Access violation writing location" error. I have tried putting the string directly as a parameter in the function call, which worked perfectly fine.

Any ideas what could be wrong?

Notice: long story short, I must use Microsoft Visual Studio and the "safe" version of scanf.

 

Screenshot of the part of my code:

 

Thanks in advance

[Zalosath]

1 hour ago, Matttaj69 said:

Hi,

I am working on a simple code in C, have got the logic almost sorted.

However, in order for my program to work, I need a user to input a string. I have tried <scanf_s("%s", potr);> (shown in picture), but while debugging, it has ended on that line with "Access violation writing location" error. I have tried putting the string directly as a parameter in the function call, which worked perfectly fine.

Any ideas what could be wrong?

Notice: long story short, I must use Microsoft Visual Studio and the "safe" version of scanf.

 

Screenshot of the part of my code:

 

Thanks in advance

You need to enter the length of the buffer for scanf_s.

scanf_s("%s", potr, sizeof(potr))

 

[Matttaj69]

22 minutes ago, Zalosath said:

You need to enter the length of the buffer for scanf_s.

That helped, thanks very much.