C Programming Typecasting Linux

[Bobby83x2]

Hi I am trying to work on a program that needs typecasting.
If I compile and run the program I get a segmentation fault.

I have found that the following code is the problem:

char* command;
int controller = 02;
strcpy(command,"V");
strcat(command,(char*) controller);

The controller is passed from a calculation and is sent as an integer, but i have to write a string to the serial port.

Is there another way to convert an integer to a string?

[Banfa]

the reason you are getting a segmentation fault is that you do not point the pointer you create (command) and any allocated memory before copying to it.

For converting ints to strings use sprintf or itoa (functions from the standard library).

[Bobby83x2]

the reason you are getting a segmentation fault is that you do not point the pointer you create (command) and any allocated memory before copying to it.

For converting ints to strings use sprintf or itoa (functions from the standard library).

Thank you,

Do you know where the itoa in the Linux operating system? I have stdlib and stdio included, but it gave me an implicit definition error

[Banfa]

Thank you,

Do you know where the itoa in the Linux operating system? I have stdlib and stdio included, but it gave me an implicit definition error

Oops just checked, itoa
is not actually part of the standard library so may not be implemented on your platform.

Grep the standard headers for it or just use sprintf.