Programming in C MCQ - I/O Operations

41 Consider following statements:
putchar(getchar());
putchar(getchar());
If
a
b
is the input, then output will be

A
An error message
B
this can't be the input
C
a, b
D
Undefined

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Comment

The input is actually a \n b. Since we are reading only two characters, only a and \n will be read and printed.

42 The program fragment
int i =263;
purchar(i);
prints

A
263
B
ASCII equivalent of 263
C
Rings the bell
D
undefined

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Comment

263 in binary form is 100000111.
If one tries to print an integer as character, only the last 8 bits will be considered-the rest chopped off.
So, in this case the ASCII value of 00000111 (i.e., decimal 7) will be printed. Look at the ASCII table. It is ringing a bell!

43 What will be the value of x and y after execution of the following statement (C language)
n ==5;x=n++;y=-x;?

A
5,4
B
6,5
C
5,6
D
5,5

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Comment

44 The following 'C' program
main
{
unsigned int num;
int i;
scanf("%u",&num);
for(i=0;i<16;i++)
printf("%d",(num<<i&1<<15)?1:0);
}

A
Prints all even bits from num
B
Error
C
Prints binary equivalent of num
D
none of these

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Comment

45 Output of the following 'C' program is
main
{
printf("\n%x",-1>>4);
}

A
ffff
B
0fff
C
0000
D
Error

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