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31/10/2020 08:10:00 AM

Câu hỏi trắc nghiệm ngôn ngữ lập trình C (tiếp theo)

Q61:

Code:

 

int i = 4;

switch (i)

{

   default:

      ;

   case 3:

      i += 5;

      if ( i == 8)

      {

         i++;

         if (i == 9) break;

         i *= 2;

      }

      i -= 4;

      break;

   case 8:

      i += 5;

      break;

}

printf("i = %d\n", i); 


What will the output of the sample code above be?
Choice 1
i = 5
Choice 2
i = 8
Choice 3
i = 9
Choice 4
i = 10
Choice 5
i = 18


Q62:
Which one of the following C operators is right associative?
Choice 1
=
Choice 2
,
Choice 3
[]
Choice 4
^
Choice 5
->


Q63:
What does the "auto" specifier do?
Choice 1
It automatically initializes a variable to 0;.
Choice 2
It indicates that a variable's memory will automatically be preserved
Choice 3
It automatically increments the variable when used.
Choice 4
It automatically initializes a variable to NULL.
Choice 5
It indicates that a variable's memory space is allocated upon entry into the block.


Q64:
How do you include a system header file called sysheader.h in a C source file?
Choice 1
#include
Choice 2
#incl "sysheader.h"
Choice 3
#includefile
Choice 4
#include sysheader.h
Choice 5
#incl



Q65:
Which one of the following printf() format specifiers indicates to print a double value in decimal notation, left aligned in a 30-character field, to four (4) digits of precision?
Choice 1
%-30.4e
Choice 2
%4.30e
Choice 3
%-4.30f
Choice 4
%-30.4f [Ans] decimal notation
Choice 5
%#30.4f


Q66:

Code:

 

int x = 0;

for ( ; ; )

{

 if (x++ == 4)

  break;

 continue;

}

printf("x=%d\n", x); 


What will be printed when the sample code above is executed?
Choice 1
x=0
Choice 2
x=1
Choice 3
x=4
Choice 4
x=5
Choice 5
x=6

Q67:
According to the Standard C specification, what are the respective minimum sizes (in bytes) of the following three data types: short; int; and long?
Choice 1
1, 2, 2
Choice 2
1, 2, 4
Choice 3
1, 2, 8
Choice 4
2, 2, 4
Choice 5
2, 4, 8


Q68:

Code:

 

int y[4] = {6, 7, 8, 9};

int *ptr = y + 2;

printf("%d\n", ptr[ 1 ] );  /*ptr+1 == ptr[1]*/


What is printed when the sample code above is executed?
Choice 1
6
Choice 2
7
Choice 3
8
Choice 4
9
Choice 5
The code will not compile.


Q69:
penny = one
nickel = five
dime = ten
quarter = twenty-five
How is enum used to define the values of the American coins listed above?
Choice 1
enum coin {(penny,1), (nickel,5), (dime,10), (quarter,25)};
Choice 2
enum coin ({penny,1}, {nickel,5}, {dime,10}, {quarter,25});
Choice 3
enum coin {penny=1,nickel=5,dime=10,quarter=25};
Choice 4
enum coin (penny=1,nickel=5,dime=10,quarter=25);
Choice 5
enum coin {penny, nickel, dime, quarter} (1, 5, 10, 25);


Q70:
char txt [20] = "Hello world!\0";
How many bytes are allocated by the definition above?
Choice 1
11 bytes

Choice 2
12 bytes
Choice 3
13 bytes
Choice 4
20 bytes
Choice 5
21 bytes
 

 

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