QUIZ-4 OF C PROGRAMMING LANGUAGE
QUIZ-4 OF C PROGRAMMING LANGUAGE
Q 1 – What is the output of the following program?
#include<stdio.h>
main()
{
int x = 3;
x += 2;
x =+ 2;
printf(“%d”, x);
}
A – 2
B – 5
C – 7
D – Compile error
Q 2 – The equivalent pointer expression by using the array element a[i][j][k][2],
A – ((((a+m)+n)+o)+p)
B – *(*(*(*(a+i)+j)+k)+2)
C – *( (((a+m)+n)+o+p)
D – *( ((a+m)+n+o+p)
Q 3 – In the given below code, the function fopen()uses “r” to open the file “source.txt” in binary mode for which purpose?
#include<stdio.h> int main (){ FILE *fp; fp = fopen(“source.txt”, “r”); return 0;}
A – For reading
B – For reading and writing
C – For creating a new file “source.txt” for reading
D – For creating a new file “source.txt” for writing
Q 4 – What will be the output of the following program?
#include<stdio.h>
int main()
{
const int x = 5;
const int *ptrx;
ptrx = &x;
*ptrx = 10;
printf(“%d\n”, x);
return 0;
}
A – 10
B – 20
C – 0
D – The program will return error
Q 5 – In the given below code, what will be the value of a variable x?
#include<stdio.h>
int main()
{
int y = 100;
const int x = y;
printf(“%d\n”, x);
return 0;
}
A – 100
B – 0
C – Print x
D – Return Error
Q 6 – What is the output of the following program?
#include<stdio.h>
main()
{
enum { india, is=7, GREAT };
printf(“%d %d”, india, GREAT);
}
A – 0 1.
B – 0 2
C – 0 8
D – Compile error
Q 7 – What is the output of the following program?
#include<stdio.h>
main()
{
struct { int x;} var = {5}, *p = &var;
printf(“%d %d %d”,var.x,p->x,(*p).x);
}
A – 5 5 5
B – 5 5 garbage value
C – 5 5 0
D – Compile error
Q 8 – What is the output of the following program?
#include<stdio.h>
main()
{
int a[3] = {2,1};
printf(“%d”, a[a[1]]);
}
A – 0
B – 1
C – 2
D – 3
Q 9 – What is the output of the following program?
#include<stdio.h>
main()
{
}
A – No output
B – Garbage
C – Compile error
D – Runtime error
Q 10 – What actually get pass when you pass an array as a function argument?
A – First value of elements in array
B – Base address of the array
C – All value of element in array
D – Address of the last element of array
ANSWER WITH EXPLAINATION
1)A
Explanation
+ in unary form is dummy operator, therefore ‘x’ is overwritten with the value +2 finally.
2)B
Explanation
If, the array element is a[i][j] = *(*(a+i)+j)
If, the array element is a[i][j][k]= *(*(*(a+i)+j)+k)
3)A
Explanation
To open a file in C programming, we can use library function fopen(). In the given above code, fopen() function is opening a file “source.txt” for reading. Here, “r” stands for reading. If, fopen() function does not find any file for reading, returns NULL
#include<stdio.h> int main (){ FILE *fp; fp = fopen(“source.txt”, “r”); return 0;}
4)D
Explanation
The above program will return error
#include<stdio.h> int main(){ const int x = 5; const int *ptrx; ptrx = &x; *ptrx = 10; printf(“%d\n”, x); return 0;}
5)A
Explanation
Although, integer y = 100; and constant integer x is equal to y. here in the given above program we have to print the x value, so that it will be 100.
6)C
Explanation
0 8, enums gives the sequence starting with 0. If assigned with a value the sequence continues from the assigned value.
7)A
Explanation
5 5 5, the two possible ways of accessing structure elements using pointer is by using -> (arrow operator) OR *.
8)B
Explaination
1, The inner indirection evaluates to 1, and the value at index 1 for outer indirection is 1.
9)A
Explaination
It is valid to have main() function empty, therefore producing no displayable output.
10)B
Explanation
By passing the name of an array as a function argument; the name contains the base address of an array and the base address (array value) get updated in the main function.
another related quiz of programming click here :
