Conditional Statements and Loops - C Programming MCQs and Answers

1 Assume that i,j and k are integer variables and their values are 8, 5 and 0 respectively. What will be the values of variables i and k after executing the following expression?

k=(j>5)?(i<5)?i-j:j-i:k-j;
i-=(k)?(i)?(j)?:(i):(k);

What will be the result of execution?

A -3 and 3

B 3 and -5

C 3 and -3

D -5 and 3

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Answer: Option [B]

Given that the values of i,j and k are 8, 5 and 0 respectively. The first statement j>5 is not executed because j=5 and i<5 is also not executed. So the program evaluate k-j, which is, 0-5=-5. So afetre execution of first expression the values are 8, 5 and -5 respectively.

In the second statement the values of k, i are non zero. so it is true for both. So the values of i, j and k are 3, 5 and -5

2 Find the error in the following program:

main()
{
	int m;
	char g;
	switch(m)
	{
		case 3: grade="P";break;
		case 2: grade="Q";break;
		case 1: grade="R";break;
		default: grade="S";break;
	}       		
}

What will be the output of the program?

A Undefined symbol "grade"

B switch statement cannot have more than three labels

C case label cannot be numbers

D none of these

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Answer: Option [A]

3 Data type of the controlling statement of a SWITCH statement cannot of the type:

A int

B char

C short

D float

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Answer: Option [D]

The SWITCH statement is a conditional statement. Using this statement we handle number of cases simultaneously. Float data type is not allowed in SWITCH statement.

4 How long the following loop runs?

for(x=0;x=3;x++)

A Three times

B Four times

C Forever

D Never

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Answer: Option [D]

The first statement of a for loop is initialize the loop counter, second is conditional statment and the third one is increment/decrement of the loop counter.

In the given expression the second statement is an assignment statement instead of condition.

So the for loop never execute.

5 The CONTINUE statemment cannot be used with

A for

B switch

C do

D while

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