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)
Let's analyze the given C program step by step:
int arr[5] = {30,50,10};
This initializes an integer arrayarrwith the first three values as 30, 50, and 10. Remaining elements are initialized to 0.int *ptr;
This declares a pointerptrof type integer.ptr = & arr[0] + 1;
This setsptrto point toarr[1]. Initially,arr[0]is 30, andarr[1]is 50, soptrnow points to the value 50.a = *ptr;
This assigns the value pointed to byptr(50) toa, soa = 50.(*ptr)++;
This increments the value atptr(which isarr[1]) by 1, changing the value from 50 to 51.ptr++;
This incrementsptrso that it now points toarr[2], which is initially 10.printf("%d", a + (*ptr) + arr[1]);
We need to evaluate the expressiona + (*ptr) + arr[1]:ais 50.*ptrnow points toarr[2], which is 10.arr[1]was incremented to 51.
The final expression becomes 50 + 10 + 51 = 111.
The computed result, 111, fits within the specified range (111, 111).
Therefore, the output of the program is 111.
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 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.- The following statement in ‘C’
int (*f())[ ];
declares
