Programming in C MCQ - I/O Operations

16 The following program fragment
int a = 4, b = 6;
printf ("%d", a = b) ;

A
outputs an error message
B
prints 0
C
prints 1
D
6

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Here in this program, the output will be '6' .
The program assigns b's value to a. So, a becomes 6. While, the "%d" will display value of the second variable in the printf statement which is "b=6"

17 The following program fragment
int i = 107, x = 5;
printf (( x > 7) ? " %d " : "%c", i ) ;
results in

A
an execution error
B
a syntax error
C
printing of k
D
none of the above

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Comment

Since x > 7 is false, the ternary operator?: returns "%c". So, print f ( "%c ", i) will be executed. So, the ASCII character corresponding to 107, i.e., ' k ' will be printed.

18 Replacing > by < in the previous question results in

A
printing of 107
B
a syntax error
C
printing of k
D
none of the above

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19 If a = 9, b = 5 and c = 3,
then the expression ( a - a/b * b % c) > a % b % c
evaluates to

A
true
B
false
C
invalid
D
0

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20 Consider the declaration
static char hello[ ] = " hello " ;
The output of printf( " % s \ n ", hello) ;
will be the same as that of

A
puts(" hello ");
B
puts( hello );
C
printf(" %s \ n", " hello ") ;
D
puts( " hello \ n ") ;

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