If You are searching for a list of all questions and answers for the LinkedIn Computer programming Skill Assessment, this is the right place for You.
Computer programming is the process within computer science whereby a graphic representation of the steps we take to solve a problem is turned into a set of instructions a machine can understand. In order to communicate these instructions to the machine, we use a programming language. The most common language used today is c-sharp, but there are many others.
Each programming language has its own set of rules, syntax, and functions that allow you to create different types of programs. For example, c-sharp can be used to create Windows applications, web applications, or services. It can also be used to create console applications, which are programs that run in a command prompt window.
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”;
Q35. Which choice is an include guard for the header file mylib.h?
- [ ]
#ifdef MYLIB_H
#undef MYLIB_H
// mylib.h content
#endif /* MYLIB_H */
- [x]
#ifndef MYLIB_H
#define MYLIB_H
// mylib.h content
#endif /* MYLIB_H */
- [ ]
#define MYLIB_H
#include “mylib.h”
#undef MYLIB_H
- [ ]
#ifdef MYLIB_H
#define MYLIB_H
// mylib.h content
#endif /* MYLIB_H */
Q36. How many times does the code inside the while loop get executed in this program?
main(){
int x=1;
while(x++<100){
x*=x;
if(x<10) continue;
if(x>50) break
}
}
- 100
- 3
- 5
- 50
Q37. File input and output (I/O) in C is done through what?
- syntax-driven components
- native interfaces
- system objects
- function calls
Q38. Directives are translated by the?
- Pre-processor
- Compiler
- Linker
- Editor
Q39. The main loop structures in C programming are the for loop, the while loop, and which other loop?
- do…while
- for…in
- repeat…until
- do…until
Q40. By default, C Functions are what type of functions?
- global
- static
- library
- system
Q41. You have written a function that you want to include as a member of structure a. How is such as structure member defiened?
- [x]
struct a {
void *f1;
};
- [ ]
struct a {
void (*f1)();
};
- [ ]
struct a {
*(void *f1)();
};
- [ ]
struct a {
void *f1();
};
Q42. A Stack data structure allows all data operations at one end only, making it what kind of an implementation?
- FIFO
- LIFO
- LILO
- LOLI
Q43. What does this program display?
main(){
char *p = “ABCDEFGHIJKLMNOPQRSTUVWXYZ”;
int i;
for (i=0;i<5;i++) *p++; *p++;
printf(“%c”,*p++);
}
- K
- M
- H
- G
Q44. Describe the relationship between lvalue and rvalue.
- An lvalue may appear only on the left-hand side of an assignment; an rvalue may appear only on the right-hand side.
- An lvalue may appear only on the left-hand side of an assignment; an rvalue may appear on either the left-hand or right-hand side.
- An lvaue and an rvalue may appear on either left-hand or right-hand side of an assignment.
- An lvalue may appear on the left-hand or right-hand side of an assignment; an rvalue may appear only on the right-hand side.
Q45. Which operator is used to access the address of a variable?
- %
- **
- *
- &
Q46. Which add function properly returns the updated value of result?
- [x]
void add (int a, int b, int *result)
{
*result = a+b;
}
main()
{
int a = 10;
int b = 20;
int result = 0;
add(a,b,&result);
}
- [ ]
void add (int a, int b, int result)
{
result = a+b;
}
main()
{
int a = 10;
int b = 20;
int result = 0;
add(a,b,result);
}
- [ ]
void add (int a, int b, int *result)
{
result = a+b;
}
main()
{
int a = 10;
int b = 20;
int result = 0;
add(a,b,result);
}
- [ ]
void add (int *a, int *b, int *result)
{
result = a+b;
}
main()
{
int a = 10;
int b = 20;
int result = 0;
add(*a,*b,*result);
}
Q47. Consider the number of the Fibonacci series below 100: 0,1,1,2,3,5,8,13,21,34,55,89. Which piece of code outputs the sequence?
- [ ]
void fibonacci(int a, int b)
{
int c = a+b;
if(a>100)
return;
printf(“%d”, a);
fibonacci(a,b);
}
int main()
{
fibonacci(0,1);
}
- [ ]
void fibonacci(int a, int b)
{
int c = a+b;
if(a>100)
return;
printf(“%d”, b);
fibonacci(a,c);
}
int main()
{
fibonacci(0,1);
}
- [x]
void fibonacci(int a, int b)
{
int c = a+b;
if(a>100)
return;
printf(“%d”, a);
fibonacci(b,c);
}
int main()
{
fibonacci(0,1);
}
- [ ]
void fibonacci(int a, int b)
{
int c = a+b;
if(a>100)
return;
printf(“%d”, c);
fibonacci(b,c);
}
int main()
{
fibonacci(0,1);
}
Q48. Which is not a storage class specifier?
- intern
- extern
- register
- static
Q49. Which line of code, after execution, results in i having the value of 1?
- for(i=1; i<=1; i++);
- for(i=1; i=10; i++);
- for(i=1; i==10; i++);
- for(i=10; i>=1; i–);
Q50. What is the value of variable c at the end of this program?
1 main() {
2 int a, b, c;
3 a=10; b=50;
4 c=a * b % a;
5 }
- 50
- 5
- 0
- 500
Q51. What is not one of the basic data types in C
- long double
- unsigned char
- array
- float
Q52. What is the member access operator for a structure?
- ,
- []
- .
- :
Q53. What standard data type provides the smallest storage size and can be used in computations?
- char
- float
- int
- short
Q54. what does the ctype tolower() function do?
- It returns TRUE for lowercase letters of the alphabet.
- It ensures that text output uses only ASCII values (0 through 127).
- It returns FALSE for lowercase letters of the alphabet.
- It converts an uppercase letter of the alphabet to lowercase.
Q55. Void pointer vptr is assigned the address of float variable g. What is a valid way to dereference vptr to assign its pointed value to a float variable named f later in the program?
float g;
void *vptr=&g;
- f=(float *)vptr;
- f=_(float _)vptr;
- f=*(float)vptr;
- f=(float)*vptr;
Q56. Using a for loop, how would you write C code to count down from 10 to 1 and display each number on its own line?
- [ ]
for(int i=10;1>0;) {
printf(“%d\n”, i);
i–;
}
- [x]
for (int i=10; i>0; i–)
printf(“%d\n”, i);
- [ ]
for (int i=1; i<=10; i++)
printf(“%d”, i);
- [ ]
for (int i=10; i>=0; i–)
printf(“%d\n”, i);
