How can we get rid of the last element of a string in C

[toktam]

Hi,

How can we get rid of the last character of a string in c???

Thanks
Toktam

[JosAH]

Hi,

How can we get rid of the last character of a string in c???

Thanks
Toktam

Change that last character to a '\0'.

kind regards,

Jos

[toktam]

Change that last character to a '\0'.

kind regards,

Jos

Thanks for that Jos,

But actually I have a string of type char* ,I changed it to an array of characters to change the last character...I need to return char* type so I returned the name of that array but I got segmentation fault...

For example:
char str[20];
str[19]='\o'
returne str;

but It gave an error...

[JosAH]

Thanks for that Jos,

But actually I have a string of type char* ,I changed it to an array of characters to change the last character...I need to return char* type so I returned the name of that array but I got segmentation fault...

For example:
char str[20];
str[19]='\o'
returne str;

but It gave an error...

That array 'str' is a local variable. Once you return from your function your
entire array is lost for the posterity (as is every local variable).

kind regards,

Jos

[AdrianH]

Thanks for that Jos,

But actually I have a string of type char* ,I changed it to an array of characters to change the last character...I need to return char* type so I returned the name of that array but I got segmentation fault...

For example:
char str[20];
str[19]='\o'
returne str;

but It gave an error...

Well you can't do it that way. Declaring the array on the stack like that will cause undefined results as that array will be available to be written over when you return from the function.

If you are passed a char* and you manipulate that one passed, it will work (unless you pass a literal c-string, i.e. "this is a literal c-string" -- note the double quotes, in which case you could get a seg fault).

If you don't want to manipulate that one, either

1. allocate a new one and specify that the caller of the function must deallocate it
2. pass two arrays, one to be read from and the other to be written to -or-
3. return a C++ string object (NOT A REFERENCE or POINTER but an OBJECT), and let the compiler deal with the deletion of the object

Hope this helps.


Adrian

[pranab2050]

Hi, i think that you are using the variable str as a local variable. and you are trying to pass it to another function. if you want to stick to your choice then you can declare the str variable as a global variable, not a local. Try it and wish you best of luck.

[AdrianH]

Hi, i think that you are using the variable str as a local variable. and you are trying to pass it to another function. if you want to stick to your choice then you can declare the str variable as a global variable, not a local. Try it and wish you best of luck.

You are invoking the dark forbidden arts of the global variable. BEWARE!!!!! Woooooo!!! (supposed to sound spooky ;))

Global variables are not recommended to be used except under close watch and exceptional circumstances. They make the code messy and unmaintainable. If you need a global variable, you really should have a relook at your design.


Adrian

[toktam]

You are invoking the dark forbidden arts of the global variable. BEWARE!!!!! Woooooo!!! (supposed to sound spooky ;))

Global variables are not recommended to be used except under close watch and exceptional circumstances. They make the code messy and unmaintainable. If you need a global variable, you really should have a relook at your design.


Adrian

Thanks alot guys for answering my question...
It helped me alot...