C Objective Questions for Experts

Question: 25

Which gcc option is used to generate assembly code from C code on Linux?

(A) -asm
(B) -S
(C) -o
(D) -c

Compiler
Level: Expert Category of MCQ: gcc

Question: 26

Which macro is used to insert assembly code in C program (GCC compiler)?

(A) __asm__
(B) _asm_
(C) __asm
(D) asm

Compiler
Level: Expert Category of MCQ: gcc

Question: 27

Which macro is used to insert assembly code in C program (VC++ compiler)?

(A) __asm__
(B) _asm_
(C) __asm
(D) asm

Compiler
Level: Expert Category of MCQ: gcc

Question: 28

Which command is to compile C code without linking using gcc compiler?

(A) gcc -o cppbuzz.c
(B) gcc -c cppbuzz.c
(C) gcc -e cppbuzz.c
(D) gcc cppbuzz.c

Compiler
Level: Expert Category of MCQ: gcc

Question: 29

Which gcc flag is used to genarate debug information for any binary file?

(A) gcc -g
(B) gcc -a
(C) gcc -e
(D) gcc -b

Compiler
Level: Expert Category of MCQ: gcc

Question: 30

Which gcc flag is used to generate maximum debug information?

(A) gcc -g0
(B) gcc -g1
(C) gcc -g
(D) gcc -g3

Compiler
Level: Expert Category of MCQ: gcc

Question: 31

Which gcc flag is used to enable all Compiler warnings?

(A) gcc -W
(B) gcc -w
(C) gcc -Wall
(D) gcc - wall

Compiler
Level: Expert Category of MCQ: gcc

Question: 32

//Program is compiled on Dev-C++ (32 bit) compiler
#include <stdio.h>
#include <string.h>

int main()
{
char arr[] = "CppBuzz.com";
printf("%d-%d", arr[0]++, arr[1]++);
return 0;
}

(A) D-Q
(B) D-A
(C) 67-112
(D) 68-113

Compiler
Level: Expert Category of MCQ: arrays

Question: 33

What should be the output of this program?
#include "stdio.h"

int main()
{
    FILE *fp;
    char c[1024];

    // "Kernighan and Ritchie" 
    fp = fopen("test.txt", "r");  
    
    c[0] = getc(fp);              
    fseek(fp, 0, SEEK_END);        
    fseek(fp, -7L, SEEK_CUR);      
    fgets(c, 6, fp);             
    puts(c);                     
    return 0;
}

(A) Kernig
(B) ernigh
(C) Kernigh
(D) Ritch

Compiler
Level: Expert Category of MCQ: filehandling

Question: 34

Which of the following Linux command is used to find out Text, Data and BSS segment size of a binary a.out?

(A) findsize a.out
(B) size a.out
(C) calc a.out
(D) ls -ltr a.out

Compiler
Level: Expert Category of MCQ: compilation

Question: 35

#include <iostream>
using namespace std;
int main ()
{
	int x, y;
	x = 2;
	y = ++x * ++x;
	cout << x << y;
	x = 2;
	y = x++ * ++x;
	cout << x << y;
	return 0;
}

(A) 412412
(B) 41649
(C) 49416
(D) 41649

Compiler
Level: Expert Category of MCQ: operators

Question: 36

What is important difference between structure & union?

(A) There is no difference
(B) Union takes less memory
(C) Union is faster
(D) Structure is faster

Compiler
Level: Expert Category of MCQ: structure

Question: 37

Can we compare two structures using any built in operator?

(A) Yes
(B) No

Compiler
Level: Expert Category of MCQ: structure

Question: 38

Which predefined function is used to write whole structure into a file ?

(A) write()
(B) fwrite()
(C) swrite()
(D) None of the above

Compiler
Level: Expert Category of MCQ: structure

Question: 39

How to minimize the padding issues with structure?

(A) Order members from largest to smallest
(B) Order memebers from smallest to largest
(C) By using only char data type
(D) By using referencial pointer

Compiler
Level: Expert Category of MCQ: operators

Question: 40

The input to the Assembler in the compilation process is

(A) Assembly Code
(B) .i file produced by Preprocessor
(C) Object Code
(D) Source Code

Compiler
Level: Expert Category of MCQ: assembler

Question: 41

What does .txt section contains?

(A) Executable Instructions
(B) Un-initialized Global Variables
(C) Un-initialized Static Variables
(D) Initialized Static & Global Variables

Compiler
Level: Expert Category of MCQ: compilation

Question: 42

Find the output of below code. Is it a++ or ++b in statement a+++b.

#include <stdio.h>

int main()
{
    int a=5, b=2;
    printf("%d", a+++b);

    return 0;
}

(A) Compilation Error
(B) 8
(C) 7
(D) 0

Compiler
Level: Expert Category of MCQ: operators

Question: 43

int main()
{
  int a = 1;
  short int  b = 2;
  float c = 3;
  if(sizeof((a == 2) ? c : b) == sizeof(float))
  {
     printf("float");
  }
  else   if(sizeof((a == 2) ? c : b) == sizeof(short int))
  {
     printf("short int");
  }
return 0;                                                                                                             
}

(A) float
(B) short int
(C) nothing
(D) compilation error

Compiler
Level: Expert Category of MCQ: operators

Question: 44

#include <stdio.h>
int main(void)
{
    char str1[] = "Hello. How are you?";
    char str2[21];
    int pos;

    for(pos=0; pos<21; pos++);
   {
      str2[pos] = str1[pos];
   }
   
   printf("str1: %s, str2: %s", str1, str2);
   return 0;
}

(A) str1: Hello. How are you?, str2: Hello. How are you?
(B) str1: Hello. How are you?, str2: Hello. How are you?nullnull
(C) str1: Hello. How are you?, str2: Hello. How are you?garbagevalue
(D) str1: Hello. How are you?, str2: garbagevalue

Compiler
Level: Expert Category of MCQ: arrays

Question: 45

#include <stdio.h>

int main()
{
int a = 0, b=1,c=2,d;

d = ++a || b++ && c++ && a++;

printf("%d %d %d %d", a,b,c,d);

return 0;
}

(A) 2 2 3 1
(B) 2 2 3 0
(C) 3 2 3 0
(D) 1 1 2 1

Compiler
Level: Expert Category of MCQ: operators

Question: 46

Find output of below C program

#include <stdio.h>

int main()
{
   char *_ptr;
   *_ptr = malloc(10);
   *_ptr = 999;
   printf("%d",*_ptr);
    return 0;
}

(A) 999
(B) 10
(C) 0
(D) Segmentation fault

Compiler
Level: Expert Category of MCQ: malloc_free

Question: 47

#include <stdio.h>

int main()
{
   char *_ptr = malloc(100);
   strcpy(_ptr, "cppbuzz");
   memset(_ptr, NULL, sizeof(_ptr));
   if(*_ptr == NULL)
   printf("NULL");
   else
   printf("%s",_ptr);
return 0;
}

(A) NULL
(B) cppbuzz
(C) Nothing is printed
(D) Typecasting Error

Compiler
Level: Expert Category of MCQ: malloc_free

Question: 48

#include "stdio.h"

int main()
{
   char *_ptr = malloc(100);
   if(_ptr!=NULL)
   free(_ptr);
   
   free(_ptr);
return 0;
}

(A) Program runs smoothly
(B) Compilation Error
(C) Runtime Error- Program crashes

Compiler
Level: Expert Category of MCQ: malloc_free

Question: 49

#include <stdio.h>

int main()
{
   char * _ptr = NULL; 
   _ptr = malloc(0);
   if(_ptr==NULL) printf("_ptr is NULL");
   else printf("_ptr not NULL");
   printf(" %p ", _ptr);
   *_ptr = '@';
   printf(" %c ", *_ptr);
   free(_ptr);
   return 0;
}

(A) _ptr is NULL 0x21f3010 @
(B) _ptr not NULL 0x21f3010 @
(C) Runtime Error: Segmentation Fault
(D) _ptr not NULL 0x21f3010

Compiler
Level: Expert Category of MCQ: malloc_free

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