Programming in C MCQ - Decision Making and Looping

31 The switch feature

A
can always be replaced by a nested it-then-else clause
B
enhances logical clarity
C
can't always be replaced by a nested if-then-else clause
D
Both (A) and (B)

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32 Break statement can be simulated by using

A
goto
B
return
C
exit
D
any of the above features

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33 The following program fragment

if (2 < 1)
;
else
x = (2 < 0) ? printf("one") : printf("four");
printf ("%d", x);

A
prints nothing
B
results in a syntax error
C
prints four 0
D
none of the above

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Comment

here else clause will be executed . Since 2 < 0 is false , 4 will be printed

34 Consider the following program fragment
if (a>b)
printf("a>b");
else
printf("else part");
printf("a<=b");
a<=b will be printed if

A
a>b
B
a<b
C
a==b
D
Both (B) and (C)

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Comment

The else clause has no brackets i.e., { and }. This means the else clause is made up of only one statement.
So, printf(" a < = b") will be executed anyway, i.e. if a > b or a <= b. Hence the answer.

35 The body of the following for loop
for( putchar( 'a' ); putchar (0); putchar (' c ') ) putchar ( 'b') ;
will be executed

A
0 times
B
1 times
C
infinitely many times
D
will not be executed because of syntax error

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Comment

The condition is putchar (0). This returns a value 0 which is a false condition.
So, the loop will not be executed even once.