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Programming Basics - C programming problems with solutions in objective type

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C programming language basics quiz & multiple choice questions(mcqs) and answers are available to download in PDF for free.
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(16) An expression contains relational, assignment and arithmetic operators. If parenthesis are not specified, the order of evaluation of the operators would be:
[A] assignment, arithmetic, relational
[B] relational, assignment, arithmetic
[C] assignment, relational, arithmetic
[D] arithmetic, relational, assignment

Comment

Answer: Option [D]
(17) Given two literals 0x001B and 033. What are these equal to?
[A] 21 and 23
[B] 27 and 33
[C] 33 and 33
[D] 27 and 27

Comment

Answer: Option [D]

Let us convert the given Hexadecimal number 0x001B to Decimal:

The first part is 0x160=0

The second part is 0x163+0x162+1x161+11x160 [Though B is equivalent to 11]

=27

So, 0+27=0

Now we convert the octal number 033 to decimal:

0x82+3x1+30

=27

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(18) What is the output of the following code segment(assuming sizeof(int) returns 4)? 

	int i=0x1 << sizeof(int)*8-1;
	printf("\n%x",i);
	i=i>>sizeof(int)*8-1;
	printf("%d",i);
[A] 0x8000000-1
[B] 80000000-1
[C] -1 0x0000000
[D] -1 0000000

Comment

Answer: Option [B]

(19) Which is the valid statement in C?
[A] #define half(x)((x)/2.0)
[B] #define STREQ(s1,s2)(strcmp((s1),(s2))==0);
[C] #define MAX=5
[D] #define INTEREST 5, LOAN 5000

Comment

Answer: Option [A]
(20) Which is the correct sequence statements that swaps values of two statements?
[A] a=a+b; a=a-b; b=a-b;
[B] a=a+b, b=a-b; a=a-b;
[C] a=a-b; a=a+b; b=b-a;
[D] None of these

Comment

Answer: Option [B]

Let us test this with an example:

Let, a=20 and b=40. After swapping them a=40 and b=20

a=a+b; a=20+40=60;

b=a-b; 60-40=20;

a=a-b; 60-20=40;

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