Right-Left Rule Examples:

I presented the Right-Left Rule in the C Programming Guide book (1982) and there have been lots of examples written since then. This is a list of example you might use to test your understanding of the Rule, including some illegal data definitions:

Here are some legal and illegal examples:

Jack, W8TEE

int i; // an int

int *p; // an int pointer (ptr to an int)

int a[]; // an array of ints

int f(); // a function returning an int

int **pp; // a pointer to an int pointer (ptr to a ptr to an int)

int (*pa)[]; // a pointer to an array of ints

int (*pf)(); // a pointer to a function returning an int

int *ap[]; // an array of int pointers (array of ptrs to ints)

int aa[][]; // an array of arrays of ints

int af[](); // an array of functions returning an int (ILLEGAL)

int *fp(); // a function returning an int pointer

int fa()[]; // a function returning an array of ints (ILLEGAL)

int ff()(); // a function returning a function returning an int (ILLEGAL)

int ***ppp; // a pointer to a pointer to an int pointer

int (**ppa)[]; // a pointer to a pointer to an array of ints

int (**ppf)(); // a pointer to a pointer to a function returning an int

int *(*pap)[]; // a pointer to an array of int pointers

int (*paa)[][]; // a pointer to an array of arrays of ints

int (*paf)[](); // a pointer to a an array of functions returning an int (ILLEGAL)

int *(*pfp)(); // a pointer to a function returning an int pointer

int (*pfa)()[]; // a pointer to a function returning an array of ints (ILLEGAL)

int (*pff)()(); // a pointer to a function returning a function returning an int (ILLEGAL)

int **app[]; // an array of pointers to int pointers

int (*apa[])[]; // an array of pointers to arrays of ints

int (*apf[])(); // an array of pointers to functions returning an int

int *aap[][]; // an array of arrays of int pointers

int aaa[][][]; // an array of arrays of arrays of ints

int aaf[][](); // an array of arrays of functions returning an int (ILLEGAL)

int *afp[](); // an array of functions returning int pointers (ILLEGAL)

int afa[]()[]; // an array of functions returning an array of ints (ILLEGAL)

int aff[]()(); // an array of functions returning functions returning an int (ILLEGAL)

int **fpp(); // a function returning a pointer to an int pointer

int (*fpa())[]; // a function returning a pointer to an array of ints

int (*fpf())(); // a function returning a pointer to a function returning an int

int *fap()[]; // a function returning an array of int pointers (ILLEGAL)

int faa()[][]; // a function returning an array of arrays of ints (ILLEGAL)

int faf()[](); // a function returning an array of functions returning an int (ILLEGAL)

int *ffp()(); // a function returning a function returning an int pointer (ILLEGAL)

--
Jack, W8TEE

Previous Topic Next Topic

开云体育

Right-Left Rule Examples: