LinkedIn Assessment Test Answers

linkedin C (Programming Language) assessment answers

 

C (Programming Language)

Q1. Which Code sample will eventually cause the computer to run out of memory?
  • [x]
while(1)
{
    char *smallString = (char *) malloc(10);
}
  • [ ]
long long number = 1;
    while(1)
    number *= 2;
  • [ ]
while(1)
{
    char hugeString[1000000L];
    memset(hugeString, 0, 1000000L);
}
  • [ ]
while(1)
{
    long *bigArray = (long *) malloc(sizeof(long) * 1000);
    memset(bigArray, 1000000, 1000);
    free(bigArray);
}

Q2. 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");
}
  • [x]
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
  •  Nothing is printed on Screen

Q3. What is the name for calling a function inside the same function?

  •  recursion
  •  subfunction
  •  inner call
  •  infinite loop

Q4. What does the declaration of variable c2 demonstrate?

main(){
    char c1 ='a';
    char c2 = c1+10;
}
  •  character arithmetic
  •  undefined assignment
  •  type conversion
  •  invalid declaration

Q5. 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;
  •  f = _(float _)vptr;
  •  f = (float *)vptr;
  •  f = *(float *)vptr;
  •  f = *(float)vptr;

Q6. What is this declaration an example of?

struct s {
    int i;
    struct s *s1;
    struct s *s2;
};
  •  a node
  •  a linked list
  •  a stack
  •  a binary tree

Q7. 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?

  •  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.

Q8. 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?

  • [ ]
for (int i = 0; i>=0, i--){
    printf("%d\n", i);
}//end of loop
  • [ ]
int i;
for (i=1; i<=10; i++){
    printf("%d", i);
}
  • [ ]
int i = 10;
while (i>0){
    printf("%d\n", i);
    i--;
}
  • [x]
int i;
for (i= 10; i>0; i--){
    printf("%d\n", i);
}// end of loop

Q9. What is not one of the reserved words in standard C?

  •  volatile
  •  typeof
  •  register
  •  typedef

Q10. 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);
}
  •  1
  •  3
  •  2
  •  0

Q11. 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;
  •  32
  •  54
  •  30
  •  52

Q12. In this code sample, what is not a problem for C compiler?

main(){
    constant int PI = 3.14;
    printf("%f\n", pi);
}
  •  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.

Q13. Which is the smallest program to compile and run without errors?

  •  main()
  •  int main() {return 0;}
  •  main() { }
  •  main() { ; }

Q14. What is optional in a function declaration?

  •  data type of parameters
  •  return type of function
  •  parameter names
  •  number of parameters

Q15. C treats all devices, such as the display and the keyboard, as files. Which files opens automatically when a program executes?

  •  stdout
  •  stdio.h
  •  default.h
  •  string.h

Q16. In which segment does dynamic memory allocation takes place?

  •  BSS Segment
  •  stack
  •  heap
  •  data segment

Q17. Which of the following do you use to deallocate memory?

  •  dalloc()
  •  dealloc()
  •  release()
  •  free()

Q18. In C language what are the basic building blocks that are constructed together to write a program?

  •  keywords
  •  identifiers
  •  tokens
  •  functions

Q19. When is memory for a variable allocated?

  •  during the assigment of the variable
  •  during the initialization of the variable
  •  during the declaration of the variable
  •  during the definition of the variable

Q20. By default c uses the call by value method to pass arguments to functions. How can you invoke the call by reference method?

  •  by using pointers
  •  by declaring functions separately from defining them
  •  by using recursive functions
  •  by using global variables

Q21. A union allows you to store different ___ in the same ___.

  •  Objects; Structure
  •  Variables; Declaration
  •  Data types; Memory location
  •  Arrays; Header file

Q22. What is the output of this program?

main() {
    char c1='a' , c2='A';
    int i=c2-c1;
    printf("%d", i);
}
  •  32
  •  Runtime error
  •  -32
  •  0

Q23. What is the difference between scanf() and sscanf() functions?

  •  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

Q24. What is not a valid command with this declaration?

char *string[20] = { "one", "two", "three"};
  •  printf(“%c”, string[1][2]);
  •  printf(“%s”, string[1][2]);
  •  printf(“%s”, string[1]);
  •  printf(string[1]);

Q25. What is the expression player->name equivalent to?

  •  player.name
  •  (*player).name
  •  *player.name
  •  player.*name

Q26. Which program will compile and run without errors?

  • [ ]
main() {
    for(i=0; i<10; i++) ;
}
  • [x]
main() {
int i=0;
    for(; i<10; i++) ;
}
  • [ ]
main() {
    int i;
    for(i=0; i<j; i++) ;
}
  • [ ]
main() {
int i;
    for (i= 10; i<10; i++)
}

Q27. What does this function call return?

1 main() { float x = f1(10, 5); }
2 float f1(int a, int b) { return (a/b); }
  •  2
  •  2.000000
  •  a runtime error
  •  a compiler error

Q28. What does this program create?

#include <stdio.h>
int main() {
    int *p = NULL;
    return 0;
}
  •  a runtime error
  •  a NULL pointer
  •  a compile error
  •  a void pointer

Q29. What is an alternative way to write the expression (*x).y?

  •  There is no equivalent.
  •  x->y
  •  *x->y
  •  y->x

Q30. Compile time errors are static errors that can be found where in the code?

  •  in declarations and definitions
  •  in functions and expressions
  •  in syntax and semantics
  •  in objects and statements

Q31. File input and output (I/O) in C is heavily based on the way it is done ___?

  •  in Unix
  •  in C++
  •  in C#
  •  in DOS

Q32. What does the strcmp(str1, str2); function return?

  •  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

Q33. What is the output of this program?

int a=10, b=20;
int f1(a) { return(a*b); }
main() {
printf("%d", f1(5));
}
  •  100
  •  200
  •  5
  •  50

Q34. Which is not a correct way to declare a string variable?

  •  char *string = "Hello World";
  •  char string = "Hello World";
  •  char string[20] = {'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd'};
  •  char string[] = "Hello World";

 

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