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02/03/2021 08:54:55 AM

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

Q111:

Which one of the following calls will open the file test.txt for reading by fgetc?
Choice 1
fopen( "test.txt", "r" );
Choice 2
read( "test.txt" )
Choice 3
fileopen( "test.txt", "r" );
Choice 4
fread( "test.txt" )
Choice 5
freopen( "test.txt" )

112:Code:

 

int m = -14;

int n = 6;

int o;

o = m % ++n;

n += m++ - o;

m <<= (o ^ n) & 3; 


Assuming two's-complement arithmetic, which one of the following correctly represents the values of m, n, and o after the execution of the code above?
Choice 1
m = -26, n = -7, o = 0
Choice 2
m = -52, n = -4, o = -2
Choice 3
m = -26, n = -5, o = -2
Choice 4
m = -104, n = -7, o = 0
Choice 5
m = -52, n = -6, o = 0
 

113:
How do printf()'s format specifiers %e and %f differ in their treatment of floating-point numbers?
Choice 1
%e displays an argument of type double with trailing zeros; %f never displays trailing zeros.
Choice 2
%e displays a double in engineering notation if the number is very small or very large. Otherwise, it behaves like %f and displays the number in decimal notation.
Choice 3
%e always displays an argument of type double in engineering notation; %f always displays an argument of type double in decimal notation. [Ans]
Choice 4
%e expects a corresponding argument of type double; %f expects a corresponding argument of type float.
Choice 5
%e and %f both expect a corresponding argument of type double and format it identically. %e is left over from K&R C; Standard C prefers %f for new code.

114:

$$Except 1 all choices are O.K.$$
c = getchar();
What is the proper declaration for the variable c in the code above?
Choice 1
char *c;
Choice 2
unsigned int c;
Choice 3
int c;
Choice 4
unsigned char c;
Choice 5
char c;[Ans]

115:
Which one of the following will define a function that CANNOT be called from another source file?
Choice 1
void function() { ... }
Choice 2
extern void function() { ... }
Choice 3
const void function() { ... }
Choice 4
private void function() { ... }
Choice 5
static void function() { ... }

116.            Which of the following are essential statement types for describing algorithms?

1.sequence
2.selection
3.repetition

117.

            What is a condition?

            1.A value which is true or false
            2.A numerical value

118.

            Which of the following are valid C++ identifiers?

            1.const
            2.y=z
            .xyz123
            Bill
            4.ThisIsALongOne
            5.Sue's
            6.two-way
            7. int
            8.so_is_this_one
            9. _amount
            10.2ndclass

119. Values can be input to variables in the program using the stream

            1.cin
            2.cout

120. Comments in C++ are started with

  1.//
 2. {
 3. ;

 

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