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C Quiz - Linkedin

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https://github.com/Ebazhanov/linkedin-skill-assessments-quizzes/blob/master/c-(programming-language)/c-quiz.md
Bianca Alexandra
Quiz by Bianca Alexandra, updated more than 1 year ago
Bianca Alexandra
Created by Bianca Alexandra almost 4 years ago
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Resource summary

Question 1

Question
Which Code sample will eventually cause the computer to run out of memory ?
Answer
  • c while(1) { char *smallString = (char *) malloc(10); } ```
  • c long long number = 1; while(1) number *= 2; ```
  • c while(1) { char hugeString[1000000L]; memset(hugeString, 0, 1000000L); } ```
  • c while(1) { long *bigArray = (long *) malloc(sizeof(long) * 1000); memset(bigArray, 1000000, 1000); free(bigArray); } ```

Question 2

Question
What will this code print on the screen? int f1 (int a, int b) { if (a > b) { printf("A is greater than B\n"); return 1; } else { printf("B is greater than A"); return 0; } } main() { if (f1(20,10) || f1(10,20)) printf("C is fun!\n"); }
Answer
  • A is greater then B C is fun!
  • A is greater then B B is greater then A C is fun!
  • A is greater then B B is greater then A
  • Northing is printed on Screen

Question 3

Question
What is the name for calling a function inside the same function?
Answer
  • recursion
  • subfunction
  • inner call
  • infinite loop

Question 4

Question
What does the declaration of variable c2 demonstrate? main(){ char c1 ='a'; char c2 = c1+10; }
Answer
  • character arithmetic
  • undefined assignment
  • type conversion
  • invalid declaration

Question 5

Question
A pointer to void named vptr, has been set to point to a floating point variable named g. What is the valid way to dereference vptr to assign its pointed value to a float variable named f later in this program? float g; void *vptr=&g;
Answer
  • f = _(float _)vptr;
  • f = (float *)vptr;
  • f = *(float *)vptr;
  • f = *(float)vptr;

Question 6

Question
What is this declaration an example of? struct s { int i; struct s *s1; struct s *s2; };
Answer
  • a node
  • a linked list
  • a stack
  • a binary tree

Question 7

Question
A C header file is a file with extension .h that contains function declarations and macro definitons to be shared between several source files. Header files are listed using the preprocessing directive #include, and can have one of the following formats: #include <fileA> or #include "fileB". What is the difference between these two formats?
Answer
  • The preprocessor will try to locate the fileA in same directory as the source file, and the fileB in a predetermined directory path.
  • The preprocessor will try to locate the fileA in the fixed system directory. It will try to locate fileB in the directory path designated by the -l option added to the command line while compiling the source code.
  • The file using fileA syntax must be system files, of unlimited number. fileB must be a user file at a maximun of one per source file.
  • The preprocessor will try to locate the fileA in a predetermined directory path. It will try to locate fileB in the same directory as the source file along with a custom directory path.

Question 8

Question
Using a for loop, how could you write a C code to count down from 10 to 1 and display each number on its own line?
Answer
  • c for (int i = 0; i>=0, i--){ printf("%d\n", i); }//end of loop ```
  • c int i; for (i=1; i<=10; i++){ printf("%d", i); } ```
  • c int i = 10; while (i>0){ printf("%d\n", i); i--; } ```
  • c int i; for (i= 10; i>0; i--){ printf("%d\n", i); }// end of loop ```

Question 9

Question
What is not one of the reserved words in standard C?
Answer
  • volatile
  • typeof
  • register
  • typedef

Question 10

Question
What does the program shown below return? int main(){ int a=1, b=2, c=3, d=4; int x = a; if (a>b) if (b<c) x=b; else x=c; return(x); }
Answer
  • 1
  • 3
  • 2
  • 0

Question 11

Question
Using the Union declaration below, how many bytes of memory space will the data of this type occupy? union Cars { char make[20]; char model[30]; short year; } car;
Answer
  • 32
  • 54
  • 30
  • 52

Question 12

Question
In this code sample, what is not a problem for C compiler? main(){ constant int PI = 3.14; printf("%f\n", pi); }
Answer
  • The value of PI needs to be set to 3.141593, not 3.14
  • The declaration of PI needs to say const, not constant.
  • The data type of PI needs to be float not int.
  • The printf statement needs to use PI, not pi.

Question 13

Question
Which is the smallest program to compile and run without errors?
Answer
  • main()
  • int main() {return 0;}
  • main() { }
  • main() { ; }

Question 14

Question
What is optional in a function declaration?
Answer
  • data type of parameters
  • return type of function
  • parameter names
  • number of parameters

Question 15

Question
C treats all devices, such as the display and the keyboard, as files. Which files opens automatically when a program executes?
Answer
  • stdout
  • stdio.h
  • default.h
  • string.h

Question 16

Question
In which segment does dynamic memory allocation takes place?
Answer
  • BSS Segment
  • stack
  • heap
  • data segment

Question 17

Question
Which of the following do you use to deallocate memory?
Answer
  • dalloc()
  • dealloc()
  • release()
  • free()

Question 18

Question
In C language what are the basic building blocks that are constructed together to write a program?
Answer
  • keywords
  • identifiers
  • tokens
  • functions

Question 19

Question
When is memory for a variable allocated?
Answer
  • during the assigment of the variable
  • during the initialization of the variable
  • during the declaration of the variable
  • during the definition of the variable

Question 20

Question
By default c uses the call by value method to pass arguments to functions. How can you invoke the call by reference method?
Answer
  • by using pointers
  • by declaring functions separately from defining them
  • by using recursive functions
  • by using global variables

Question 21

Question
A union allows you to store different ___ in the same ___.
Answer
  • Objects; Structure
  • Variables; Declaration
  • Data types; Memory location
  • Arrays; Header file

Question 22

Question
What is the output of this program? main() { char c1='a' , c2='A'; int i=c2-c1; printf("%d", i); }
Answer
  • 32
  • runtime error
  • -32
  • 0

Question 23

Question
What is the difference between scanf() and sscanf() functions?
Answer
  • The scanf() function reads data formatted as a string; The sscanf() function reads string input from the screen.
  • The scanf() function reads formatted data from the keyboard; The sscanf() function reads formatted input from a string.
  • The scanf() function reads string data from the keyboard; The sscanf() function reads string data from a string.
  • The scanf() function reads formatted data from a file; The sscanf() function reads input from a selected string

Question 24

Question
What is not a valid command with this declaration? char *string[20] = { "one", "two", "three"};
Answer
  • printf("%c", string[1][2]);
  • printf("%s", string[1][2]);
  • printf("%s", string[1]);
  • printf(string[1]);

Question 25

Question
What is the expression player->name equivalent to?
Answer
  • player.name
  • (*player).name
  • *player.name
  • player.*name

Question 26

Question
Which program will compile and run without errors?
Answer
  • c main() { for(i=0; i<10; i++) ; } ```
  • c main() { int i=0; for(; i<10; i++) ; } ```
  • c main() { int i; for(i=0; i<j; i++) ; } ```
  • c main() { int i; for (i= 10; i<10; i++) } ```

Question 27

Question
What does this function call return? 1 main() { float x = f1(10, 5); } 2 float f1(int a, int b) { return (a/b); }
Answer
  • 2
  • 2.000000
  • a runtime error
  • a compiler error

Question 28

Question
What does this program create? #include <stdio.h> int main() { int *p = NULL; return 0; }
Answer
  • a runtime error
  • a NULL pointer
  • a compile error
  • a void pointer

Question 29

Question
What is an alternative way to write the expression (*x).y?
Answer
  • There is no equivalent.
  • x->y
  • *x->y
  • y->x

Question 30

Question
Compile time errors are static errors that can be found where in the code?
Answer
  • in declarations and definitions
  • in functions and expressions
  • in syntax and semantics
  • in objects and statements

Question 31

Question
File input and output (I/O) in C is heavily based on the way it is done ___?
Answer
  • in Unix
  • in C++
  • in C#
  • in DOS

Question 32

Question
What does the strcmp(str1, str2); function return?
Answer
  • 0 if str1 and str2 are the same, a negative number if str1 is less than str2, a positive number if str1 is greater than str2
  • true (1) if str1 and str2 are the same, false (0) if str1 and str2 are not the same
  • true (1) if str1 and str2 are the same, NULL if str1 and str2 are not the same
  • 0 if str1 and str2 are the same, a negative number if str2 is less than str1, a positive number if str2 is greater than str1
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