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 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 C program:
#include <stdio.h>
void stringcopy(char *, char *);
int main(){
char a[30] = "@#Hello World!";
stringcopy(a, a + 2);
printf("%s\n", a);
return 0;
}
void stringcopy(char *s, char *t) {
while(*t)
*s++ = *t++;
}
Which ONE of the following will be the output of the program?Consider the following C program:
#include <stdio.h>
int main(){
int a;
int arr[5] = {30,50,10};
int *ptr;
ptr = & arr[0] + 1;
a = *ptr;
(*ptr)++;
ptr++;
printf("%d", a + (*ptr) + arr[1]);
return 0;
}
The output of the above program is ____________ (Answer in integer)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.
