int (*f())[ ];
declares
Interpreting C Declaration: $int (*f())[ ];$
To understand the declaration $int (*f())[ ];$, we break it down based on C's declaration rules (right-left parsing):
- $f()$: This indicates that $f$ is a function.
- $(*f())$: The parentheses around $*f$ bind the dereference operator $*$ to the result of the function call $f()$. This means $f$ returns a pointer.
- $(*f())[...]$: The square brackets $[...]$ indicate an array. The type specified is $int$.
- $int (*f())[ ]$: Combining these, the declaration signifies that $f$ is a function that returns a pointer to an array of integers. The empty brackets $[ ]$ signify that the size of the array is not specified in this declaration, which is permissible for the return type of a function when dealing with pointers to arrays.
Therefore, the statement declares a function returning a pointer to an array of integers.
Important Questions from Pointer
What is the output of the following C programming language code?
#include<stdio.h>
int main()
{
int x = 10;
int *p = &x;
*p = *p + 5;
printf("%d %d", x, *p);
return 0;
}
- What would be the equivalent pointer expression for referring the array element ar[m][n][o]
- Only legal pointer operations:
A. pointer + number $\rightarrow$ pointer
B. pointer - number $\rightarrow$ number
C. pointer + pointer $\rightarrow$ pointer
D. pointer - pointer $\rightarrow$ pointer
E. pointer - pointer $\rightarrow$ number
Choose the most appropriate answer from the options given below: Consider the following ANSI-C program.
#include <stdio.h>
int main(){
int *ptr, a, b, c;
a=5; b=11; c=20;
ptr=&a; *ptr=c; ptr=&c;
a=*(&b); c=*ptr-a;
printf("%d",c);
return(0);
}
The output of this program is ____________. (answer in integer)
Note: Assume that the program compiles and runs successfully.What is the output of the following program ?
(Assume that the appropriate preprocessor directives are included and there is no syntax error)
main ( )
{ char S[ ]="ABCDEFGH";
printf ("%C", * (& S[3]));
printf ("%s", S+4);
printf ("%u", S);
/* Base address of S is 1000 */
}
