Questions and answers for exam Preparation

MCQs

Total Questions : 66 | Page 6 of 7 pages

Question 51.

What is the output of the program

#include<stdio.h>
int main()
{
int a[5] = {2, 3};
printf("%d, %d, %d\n", a[2], a[3], a[4]);
return 0;
}

Garbage Values
2, 3, 3
3, 2, 2
0, 0, 0

Discuss Question

Answer: Option D. -> 0, 0, 0

When an automatic array is partially initialized, the remaining elements are initialized to 0.

Question 52.

What is the output of the program in Turbo C (in DOS 16-bit OS)?

#include<stdio.h>
int main()
{
char *s1;
char far *s2;
printf("%d, %d, %d\n", sizeof(s1), sizeof(s2));
return 0;
}

Discuss Question

Answer: Option A. -> 2 4

Any pointer size is 2 bytes. (only 16-bit offset)
So, char *s1 = 2 bytes.
So, char far *s2 = 4 bytes.

A far pointer has two parts: a 16-bit segment value and a 16-bit offset value.

Since C is a compiler dependent language, it may give different
output in other platforms. The above program works fine in Windows
(TurboC), but error in Linux (GCC Compiler).

Question 53.

What is the output of the program ?

#include<stdio.h>
int main()
{
extern int fun(float);
int a;
a = fun(3.14);
printf("%d\n", a);
return 0;
}
int fun(int aa)
{
return (int)++aa;
}

3
3.14
0
Compile Error

Discuss Question

Answer: Option D. -> Compile Error

2 Errors
1. Type mismatch in redeclaration of fun
2. Type mismatch in parameter aa

Question 54.

What is the output of the program

#include<stdio.h>
int main()
{
int x = 10, y = 20, z = 5, i;
i = x < y < z;
printf("%d\n", i);
return 0;
}

0
1
Error
None of these

Discuss Question

Answer: Option B. -> 1

Since x < y turns to be TRUE it is replaced by 1. Then 1 < z is compared and to be TRUE. The 1 is assigned to i.

Question 55.

What would be the output of the following program ?

#include<stdio.h>
int X=40;
int main()
{
int X=20;
printf("%d\n", X);
return 0;
}

20
40
Error
No output

Discuss Question

Answer: Option A. -> 20

Whenever there is conflict between a local variable and global variable, the local variable gets priority.

Question 56.

Which of the following statements should be used to obtain a remainder after dividing 3.14 by 2.1 ?

rem = 3.14 % 2.1;
rem = modf(3.14, 2.1);
rem = fmod(3.14, 2.1);
Remainder cannot be obtain in floating point division.

Discuss Question

Answer: Option C. -> rem = fmod(3.14, 2.1);

fmod(x,y) - Calculates x modulo y, the remainder of x/y.
This function is the same as the modulus operator. But fmod() performs floating point divisions.