Đề Thi FE PRF192 - SP26 - B5 - FE - RE

admin · 3/5/26

PRF192 SP26 B5 FE RE

Câu 1 (Multiple Choice - Chọn 1 đáp án)

What is the result when converting 0111 1011 in binary system to decimal system?

A. 120

B. 121

C. 122

D. 123

Câu 2 (Multiple Choice - Chọn 1 đáp án)

What does the line scanf("%d", &n); do?

A. Assign value to n

B. Print n

C. Read an integer input

D. Declare

Câu 3 (Multiple Choice - Chọn 1 đáp án)

Given the variable arr declared as follow: char arr[16];

What is the maximum number of characters you can store in arr to represent a null-terminated strings?

A. 13

B. 14

C. 15

D. 16

Câu 4 (Multiple Choice - Chọn 1 đáp án)

What is the numeric code of the NULL character?

A. 1

B. 0

C. -1

D. 32

Câu 5 (Multiple Choice - Chọn 1 đáp án)

Given the following code snippet:

C

#include <stdio.h> int main() { int a = 5; { int b = 10; printf("%d ", a); // Uncommenting the line of code below will be a compilation error. // printf("%d", b); } return 0; } 
Which of the following best describes the scope of a variable declared inside a block in C?

A. The variable b can be accessed only inside the inner block where it's declared.

B. The variable b can be accessed anywhere within main() after its declaration.

C. Both variables a and b can be accessed inside the inner block.

D. The variable b can be accessed globally throughout the program.

Câu 6 (Multiple Choice - Chọn 1 đáp án)

What is the size of the char data type in bytes?

A. 1 byte

B. 2 bytes

C. 4 bytes

D. It depends on the system

Câu 7 (Multiple Choice - Chọn 1 đáp án)

What does the following program display?

C

#include <stdio.h> int main() { int x[]={1,2,3,4,5}; int y=1; printf("%d", x[y]); return 0; } 
A. 2

B. 3

C. 4

D. An error will be raised.

Câu 8 (Multiple Choice - Chọn 1 đáp án)

What does this code do?

char names[10][31];

gets (names[0]);

A. Takes a line of input into names[0]

B. Takes input into all 10 strings

C. Fails to compile

D. Only stores 1 character

Câu 9 (Multiple Choice - Chọn 1 đáp án)

What does the '\0' character in a string represent?

A. The null terminator in C strings

B. A whitespace character

C. A printable character

D. A NULL pointer value

Câu 10 (Multiple Choice - Chọn 1 đáp án)

Using DeMorgan's Law, how would you correctly negate the condition (x>=10 && x<=20)?

A. (x<10 || x>20)

B. (x>10 && x<20)

C. (x<10 && x>20)

D. !(x>=10 || x<=20)

Câu 11 (Multiple Choice - Chọn 1 đáp án)

Which is the correct syntax for a for loop in C?

A. for (initialization, condition, increment) { statements; }

B. for { initialization; condition; increment; } (statements

C. for (initialization; condition; increment) { statements; }

D. for: (initialization; condition; increment) (statements

Câu 12 (Multiple Choice - Chọn 1 đáp án)

How to declare a variable in C language?

A. All variables must be declared before we use them in C program.

B. To declare a variable you specify its name and data type it can store.

C. All variable are always stored on the stack.

D. Reading a value from keyboard or other device with a OUT statement

E. The scope of a variable is the range of program statements that can't access that variable.

Câu 13 (Multiple Choice - Chọn 1 đáp án)

What will be the output of the following C code?

C

#include <stdio.h> void main() { int x = 0; if (x == 0) printf("Hi"); else printf("How are you"); printf("Hello"); } 
A. Hi

B. How are you

C. Hello

D. HiHello

Câu 14 (Multiple Choice - Chọn 1 đáp án)

Which is incorrect statement in C programming?

A. #define is a preprocessor command often used to introduce named constants

B. double and goto are keyword for declaring data type.

C. return 0; is normally the last statement in main()

D. The file stdio.h is the library where the compiler finds scanf().

Câu 15 (Multiple Choice - Chọn 1 đáp án)

What does this code print?

int n=30, m=5;

float x=3.5F, y=8.12F;

printf("%d, %d\n", (n < m || x >= y), !(x > y));

A. 1, 0

B. 0, 1

C. 1, 1

D. 0, 0

Câu 16 (Multiple Choice - Chọn 1 đáp án)

What is the output of the following code?

int a=10, b=20;

printf("%d", (a>5 && b<25));

A. 0

B. 1

C. 10

D. 20

Câu 17 (Multiple Choice - Chọn 1 đáp án)

What will the following program print?

C

#include <stdio.h> int main() { int x=5, y=10; while (x++ < y--) { printf("%d %d\n", x, y); } return 0; } 
A. 6 9, 7 8, 8 7 (Trình bày dạng cột trong đề)

B. 6 9, 7 8, 8 7

C. 5 10, 7 8, 8 7

D. 6 9, 2 2, 8 7

Câu 18 (Multiple Choice - Chọn 1 đáp án)

What is the main purpose of a module in programming?

A. To carry out a specific function and may be used alone or combined with other modules to create a program

B. To store data in a database

C. To handle user input exclusively

D. To perform arithmetic calculations only

Câu 19 (Multiple Choice - Chọn 1 đáp án)

Which of the following switch statement will correctly compute the result for the expression 5*4?

C

double result; char op = '*'; int num1 = 5, num2 = 4; switch (op) { case '+': result = num1 + num2; break; case '-': result = num1 - num2; break; case '*': result = num1 * num2; break; case '/': if (num2 != 0) result = num1/num2; break; default: printf("Invalid Operator"); } printf("%d", result); 
A. 20

B. 9

C. 1.25

D. 0

Câu 20 (Multiple Choice - Chọn 1 đáp án)

Which of the following about the switch case statement is true?

A. It can only be used with integer or character type expressions.

B. It can be used with any data type.

C. It can only be used in functions.

D. It can only have one case statement inside.

Câu 21 (Multiple Choice - Chọn 1 đáp án)

What is the output when the sample code below is executed?

C

#include <stdio.h> int main() { int x = 7; for (; x > 3; ) { printf("Yes"); x--; } return 0; } 
A. Infinite loop

B. Compile time error

C. Yes Yes Yes Yes

D. Yes

Câu 22 (Multiple Choice - Chọn 1 đáp án)

What will happen if the condition in a while loop is initially false?

A. The loop is skipped entirely.

B. The loop executes indefinitely.

C. The loop executes once and then terminates.

D. An error occurs.

Câu 23 (Multiple Choice - Chọn 1 đáp án)

What is the purpose of the function void atoi (const char*)? (Lưu ý: Đề ghi void nhưng chuẩn là int)

A. Converts a string to an integer

B. Converts an integer to a string

C. Copy a string

D. Converts a string to a number

Câu 24 (Multiple Choice - Chọn 1 đáp án)

Which library in C is used for mathematical calculations?

A. math.h

B. stdlib.h

C. time.h

D. ctype.h

Câu 25 (Multiple Choice - Chọn 1 đáp án)

Which follows the function used to remove the keyboard buffer?

A. fflush()

B. clearbuffer()

C. clear input()

D. clrscr()

Câu 26 (Multiple Choice - Chọn 1 đáp án)

What will be printed when the following program is executed?

C

#include <stdio.h> int f(int a, int b, int c) { int t = 2*(a+b-c)/5; return t; } int main() { int x=5, y=6, z=7; int t = 3*f(y,x,z); printf("%d", t); return 0; } 
A. 3

B. 1

C. 8

D. 2

Câu 27 (Multiple Choice - Chọn 1 đáp án)

Which library contains the abs() function?

A. time.h

B. conio.h

C. math.h

D. stdlib.h

Câu 28 (Multiple Choice - Chọn 1 đáp án)

What is incorrect about function prototype?

A. void printSum(int* a, int b);

B. int printSum(int* a, int b);

C. int printSum(int a, b);

D. int* printSum(int* a, int b);

Câu 29 (Multiple Choice - Chọn 1 đáp án)

In the C language, which method is used when a function receives a copy of the argument's value, ensuring that changes inside the function do not affect the original variable?

A. Pass by value

B. Pass by reference

C. Pass by address

D. Pass by pointer

Câu 30 (Multiple Choice - Chọn 1 đáp án)

What is the value of variable a after executing the following lines of codes:

int a = 0;

char line1[] = "Hi";

char line2[] = "Hello";

a = strcmp(line1, line2);

A. 0

B. A positive value

C. A negative value

D. NAN

Câu 31 (Multiple Choice - Chọn 1 đáp án)

What is the correct way to ensure a different sequence of random numbers in each program run?

A. rand(time(0));

B. srand(time(NULL));

C. srand();

D. randomize();

Câu 32 (Multiple Choice - Chọn 1 đáp án)

What is an array in C programming?

A. A collection of elements of the same data type stored in contiguous memory locations.

B. A single variable that holds multiple values of different data types.

C. A pointer to a single element in memory

D. A function that performs mathematical calculations.

Câu 33 (Multiple Choice - Chọn 1 đáp án)

What is the output when the sample code below is executed?

C

#include<stdio.h> void increment(int *ptr) { (*ptr)++; } int main(){ int x = 1005; increment(&x); printf("%d ",x); } 
A. 1006

B. 1005

C. 0

D. 1007

Câu 34 (Multiple Choice - Chọn 1 đáp án)

What is the output of the following code?

int a[5] = {1, 2, 3, 4, 5};

printf("%d", a);

A. Address of the first element of array a

B. Compiler error

C. Garbage value

D. Error: mismatched format specifier in printf

Câu 35 (Multiple Choice - Chọn 1 đáp án)

What is the output of the variable "sum" in the following code:

C

int a[] = {1, 2, 3, 4, 5}, i; float sum = 0; for (i = 0; i < 4; i++) { sum = sum + a / a[i+1]; } printf("%.2f", sum); 
A. 0.00

B. 2.72

C. 2.80

D. Runtime Error

Câu 36 (Multiple Choice - Chọn 1 đáp án)

What does the following code print?

C

#include <stdio.h> void swap(int a, int *b) { int temp = a; a = *b; *b = temp; } int main() { int x = 5; int y = 10; swap(x, &y); // Đề ghi swap(x, y) nhưng có vẻ thiếu & printf("x = %d, y = %d\n", x, y); return 0; } 
A. Runtime error.

B. Compiler error.

C. x = 5, y = 10

D. x = 10, y = 5

E. x = 10, y = 10

F. x = 5, y = 5

Câu 37 (Multiple Choice - Chọn 1 đáp án)

What will the following program output?

C

#include <stdio.h> #define ANSWER 42 int main() { printf("%d", ANSWER); return 0; } 
A. 42

B. ANSWER

C. Compilation Error

D. No Output

Câu 38 (Multiple Choice - Chọn 1 đáp án)

In C programming, a variable is frequently used to store the address of another variable. What is the name of this variable?

A. Pointer

B. Address

C. Integer

D. Byte

Câu 39 (Multiple Choice - Chọn 1 đáp án)

Assume we have a snippet code in C:

C

int main() { int *p = NULL; printf("%d", p); getchar(); return 0; } 
The output will be:

A. 0

B. 1

C. 10

D. 100

Câu 40 (Multiple Choice - Chọn 1 đáp án)

What will be the output of the following program?

C

int main() { int i = 100; int *p = &i; *p += 2; printf("%d, %d", i, *p); getchar(); return 0; } 
A. 102, 102

B. 100, 102

C. 100, 100

D. 102, 100

Câu 41 (Multiple Choice - Chọn 1 đáp án)

What represents dynamic allocation in C?

A. int* a = (int*)malloc(5*sizeof(int));

B. int a[5]

C. int a[5][5];

D. free(a);

Câu 42 (Multiple Choice - Chọn 1 đáp án)

Which function is used to open a text file?

A. open()

B. fopen()

C. fileopen()

D. openfile()

Câu 43 (Multiple Choice - Chọn 2 đáp án)

What is incorrect when output a string? (Choose 2 correct answers)

A. putc(s)

B. puts(s)

C. printf(s)

D. printf("%s", s)

Câu 44 (Multiple Choice - Chọn 1 đáp án)

What does the following code print?

float y = 3/2;

printf("%f", y);

A. 1.000000

B. 1.500000

C. 1.0

D. 1.5

E. 1

F. Compiler error

Câu 45 (Multiple Choice - Chọn 1 đáp án)

What function is used to read a line from the specified stream and store it in the string pointed from a file?

A. fgets

B. fgetc

C. fputs

D. fpusc

Câu 46 (Multiple Choice - Chọn 2 đáp án)

Which of the following file modes in C will create a file if it does not already exist and allow both reading and writing? (Choose 2 answers).

A. "r"

B. "w+" (Đề ghi "wt")

C. "a+"

D. "r+"

Câu 47 (Multiple Choice - Chọn 1 đáp án)

What does the following code do?

int a=5, b=7;

int *pa=&a, *pb=&b;

*pa = *pa + *pb;

A. Adds values at addresses a and b

B. Swaps the values

C. Stores the address of b in a

D. Multiplies both numbers

Câu 48 (Multiple Choice - Chọn 1 đáp án)

How are strings typically represented in C?

A. As an array of characters

B. As an array of strings

C. As individual characters

D. As integers referencing ASCII values

Câu 49 (Multiple Choice - Chọn 1 đáp án)

Which of the following is NOT mentioned as a reason why C is selected as the first programming language?

A. C has object-oriented features.

B. C is English-like

C. C is faster and more powerful than other high-level languages.

D. C supports basic ways to understand the memory of a program

Câu 50 (Multiple Choice - Chọn 1 đáp án)

What does the following program display?

C

#include <stdio.h> int main() { int arr[] = {3, 6, 9, 12}; for (int i = 3; i >= 0; i -= 2) printf("%d ", arr); return 0; } 
A. 3 9

B. 12 6

C. 12 6 3

D. 12 9 6

Đề Thi FE PRF192 - SP26 - B5 - FE - RE

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