400 Câu hỏi trắc nghiệm lập trình C/C++ có đáp án và lời giải chi tiết

#include <stdio.h>
#include <conio.h>
 
void swap(char **, char **);
 
int main()
{
    char *pstr[2] = {"LAPTRINHC++", ".NET"};
    swap(&pstr[0], &pstr[1]);
    printf("%s%s", pstr[0], pstr[1]);
    getch();
}
void swap(char **t1, char **t2)
{
    char *t;
    t=*t1;
    *t1=*t2;
    *t2=t;
}

A. LAPTRINHC++.NET

B. .NETLAPTRINHC++

C. Address of pstr[0] Address of pstr[1]

#include <stdio.h>
#include <conio.h>
 
typedef struct
{
    char c; // 1 byte
    float b; // 4 byte
    int a;   // 4 byte
}A; 
 
void main()
{
    printf("\n Size of struct: %d", sizeof(A));
    getch();
}

A. 9

B. 12

C. 16

D. 24

#include <stdio.h>
#include <conio.h>
 
typedef struct
{
    int a[2];   // 8 byte
    char b[5]; // 5 byte
    char c[5]; // 5 byte
     
}A; 
 
void main()
{
    printf("\n Size of struct: %d",sizeof(A));
    getch();
}

A. 20

B. 18

C. 32

D. 24

#include <stdio.h>
#include <conio.h>
 
struct birthday 
{
    int d; // day
    int m; // month
    int y; // year
};
struct info
{
    int ID; // code of staff
    birthday b;   
};
 
void main()
{
    info a = {1009, 16, 9, 1989};
    printf("\nID=%d, dd/mm/yyyy = %d/%d/%d", a.ID, a.b.d, a.b.m, a.b.y);
    getch();
}

A. ID=1009, dd/mm/yyyy = 16/09/1989

B. ID = 1009, dd/mm/yyyy = garbage value/garbage value/garbage value (garbage value: giá trị rác)

C. Error sytax (Lỗi cú pháp)

#include <stdio.h>
#include <conio.h>
 
void main()
{
    struct site
    {
        char name[] = "laptrinhc++";
        int year = 2;
    };
    struct site *ptr;
    printf("%s ", ptr->name);
    printf("%d", ptr->year);
    
    getch();
}

A. laptrinhc++ 2

B. Complier error

C. Runtime error

#include <stdio.h>
#include <conio.h>
 
typedef struct
{
    int x;
    static int y;
}st;
 
void main()
{
    printf("sizeof(st) = %d", sizeof(st));
    getch();
}

A. 4

B. Complier error

C. 8

#include <stdio.h>
#include <conio.h>
 
struct
{ 
    short s[5];
    union
    { 
        float y; 
        long z; 
    }u; 
} t;
 
void main()
{
    printf("sizeof(st) = %d", sizeof(t));
    getch();
}

A. 16

B. 22

C. 32

D. 18

A. Equality comparison ( == )

B.  Assignment ( = )

C. Both of the above

D. None of the above

#include <stdio.h>
#include <conio.h>
 
#define x 5+2
 
void main()
{
    int i;
    i = x*x*x;
    printf("%d", i);
    getch();
}

A. 21

B. 27

C. Complier Error

D. Another

#include <stdio.h>
#include <conio.h>
 
#define call(x,y) x##y
 
void main()
{
    int x = 5, y = 10, xy = 20;
    printf("%d", xy + call(x, y));
    getch();
}

A.  530

B. 70

C. 40

D. Complier Error

#include <stdio.h>
#include <conio.h>
 
#if X == 3
#define Y 3
#else
#define Y 5
#endif
 
void main()
{
    printf("Y = %d", Y);
    getch();
}

A. Y = 3

B. Y = 5

C. Garbage value

#include <stdio.h>
#include <conio.h>
 
#define X 3
#if !X
printf("C/C++");
#else
printf("Java");
#endif
 
void main()
{
    getch();
}

A. C/C++

B. Java

C. Complier error

#include <stdio.h>
#include <conio.h>
 
#define ISEQUAL(X, Y) X == Y
 
void main()
{
#if ISEQUAL(X, 0)
    printf("C/C++");
#else
    printf("Java");
#endif
    getch();
}

A. C/C++

B. Java

C. Complier error

#include <stdio.h>
#include <conio.h>
 
#define SQUARE(x) x*x
 
void main()
{
    int x;
    x = 36 / SQUARE(6);
    printf("%d", x);
    getch();
}

A. 1

B. 36

C. 6

D. 30

#include <stdio.h>
#include <conio.h>
 
#define a 10
 
void main()
{
    printf("%d ", a);
#define a 50
    printf("%d ", a);
    getch();
}

A. 10 50

B. 10 10

C. 50 50

#include <stdio.h>
#include <conio.h>
 
#define MAX 1000
 
void main()
{
    int MAX = 100;
    printf("%d ", MAX);
    getch();
}

A. 1000

B. 100

C. Complier error

#include <stdio.h>
#include <conio.h>
 
#define PRINT(i, limit) do \
                        { \
                        if (i++ < limit) \
                            { \
                            printf("laptrinhc++"); \
                            continue; \
                            } \
                        }while(1)
 
void main()
{
    PRINT(0, 3);
    getch();
}

A.  ‘laptrinhc++’ is printed 3 times

B. ‘laptrinhc++’ is printed 2 times

C. Complier error

A. constructor

B. destructor

C. static method

A. private

B. public

C. protected

D. protect

A.  private, public

B. protected, public

C. public, private

D. public, protected

A. reusability

B. encapsulation

C. development

A. public, private, protected

B. public, private, protect

C. public, private, static

A. containment, inheritance

B. hiding, inheritance

C. encapsulation, inheritance

A. =0

B. =1

C. =-1

A. &

B. *

C. &&

A. 0

B. 1

C. 4

A. pure virtual

B. static

C. private

A. new

B. alloc

C. malloc

A. data types, objects

B. data types, constant

C. data types, pointer

A.  class

B. object

C. function

A. Steven Job, AT&T Bell Labs

B. Bjarne Stroustrup, AT&T Bell Labs

C. Guido van Rossum, M&D Lab

A. procedural, object oriented

B. object, procedural

C. procedural, STL

A. value, object

B. object, class

C. variables, functions

A. static

B. register

C. auto

A. Stack

B. Heap

C. Register

A. runtime exception

B. syntax error

C. logic error

A. debugging

B. checking memory leak

C. library for time

A.  automatically

B. manually

C. none of above

A.  return type

B. parameter lists

C. none of above

A. static

B. run-time

C. default

A. dynamic

B. static

C. public

A. Run time and compile time

B. Preprocessor, compile time

C. Preprocessor, Linker

A. console

B. windows

C. none of above

A. container class

B.  time class

C. none of above

A. less flexible

B. more flexible

C. none of above

A. private

B.  public

C. protected

A. Stack, Queue, Priority_queue

B. Set, Multiset, Map

C. vectors, lists, deques

A. catch

B. try

C. none of above

A. template parameters

B. keyword

C. none of above

A. TRUE

B. FALSE