Making a linked list and the problem is it keeps saying the pointer type is incompatible

struct _st开发者_开发百科data{
    int stid;
    int sttype;
    struct stdata *nextptr;
};

typedef struct _stdata stdata;
stdata *new = malloc(sizeof(stdata));
new->nextptr = new;

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In your struct your should have

struct _stdata *nextptr;

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It's how your definition is set up. The following should work for you:

typedef struct stdata stdata;
struct stdata
{
    int stid;
    int sttype;
    stdata *nextptr;
};

Alternatively, you can do what Doug suggested, but typedefing your struct like this makes your code cleaner.

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Is the error/warning on this line?

stdata *new = malloc(sizeof(stdata));

You just need to include a cast:

stdata *new = (stdata*) malloc(sizeof(stdata));

By the way "new" is a terrible variable name, as it's a reserved word in C++ and it looks very confusing to most people!

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There are a few problems with your code but to get it to compile, you must change the pointer type in the struct to stdata, struct _stdata is causing you problems. Also place the typedef at the top of file, and include stdlib.h for malloc.

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in your struct you've used stdata before defining it. you should use _stdata instead