C Operators MCQs

C Operators MCQs

1. Which of the following is not a compound assignment operator?

a) /=
b) +=
c) %=
d) ==
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2. What will be the output of the following code snippet?

Y = 5;
if (! Y > 10)
X = Y + 3;
else
X = Y + 10;

printf(“ X = %d Y = %d”, X, Y);

a) The program will print X = 15 Y = 5
b) The program will print X = 15 Y = 0
c) The program will print X = 8 Y = 5
d) The program will print X = 3 Y = 0
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3. Which of the following statement is correct about the code snippet given below?

num = 5;
printf( “%d”, ++num++ );

a) The code will print 5
b) The code will print 6
c) The code will result in L – value required
d) The code will result in R – value required
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4. Which of the following statement is correct about the code snippet given below?

#include < stdio.h>
int main()
{
float z = 12.35, c = 10;
if( ++z%10 -z)
c += z;
else
c - = z;
printf( “%f %f”, z, c);
return 0;
}

a) The program will result in compile time error
b) The program will print 12.35 22.35
c) The program will print 13.35 22.35
d) The program will print 1.35 11.35
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5. Which of the following statement is correct about the code snippet given below?

#include < stdio.h>
int main()
{
int n = 12, k;
printf(“%d”, (k = sizeof( n + 12.0))++);
return 0;
}

a) The code will print 17
b) The code will print 5
c) The code will result compile time error
d) The code will print 4
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6. Which is executed quickly?

a) ++p
b) P++
c) Both
d) P+1
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7. What is the value of X in the sample code given below?

double X; X = ( 2 + 3) * 2 + 3;

a) 10
b) 13
c) 25
d) 28
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8. What value will be stored in z if the following code is executed?

main()
{
int x = 5; y = -10, z;
int a = 4, b = 2;
z = x+++++y * b/a;
}

a) -2
b) 0
c) 1
d) 2
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9. What is the output of the following program?

#include < stdio.h>
int main()
{
int max =123, min = 10, *maxptr = &max, *minptr = &min;
int **nptr = &minptr, **mptr = &maxptr;
*maxptr = ++*mptr % **nptr;
max - = ( *minptr -**nptr && *maxptr || *minptr);
printf( “ %d %d”, ++**mptr, *minptr);
return 0;
}

a) 4 10
b) 3 11
c) 3 10
d) 4 11
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10. What will be the output of the following program?

#include < stdio.h>
int main()
{
int num = 0, z = 3;
if ( ! (num <= 0) || ++z )
printf( “%d %d ”, ++num + z++, ++z );
else
printf( “%d %d”, - -num + z- -, - - z);
return 0;
}

a) – 2 1
b) 6 5
c) 4 5
d) 5 5
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11. Which of the following statement is correct about the code snippet given below?

#include < stdio.h>

int main()
{
int a = 10, b = 2, c;
a = !( c = c == c) && ++b;
c += ( a + b- -);
printf( “ %d %d %d”, b, c, a);
return 0;
}

a) The program will print the output 1 3 0
b) The program will print the output 0 1 3
c) The program will results in expression syntax error
d) The program will print the output 0 3 1
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12. Which of the following is the better approach to do the operation i = i * 16?

a) Multiply I by 16 and keep it
b) Shift left by 4 bit
c) Add I 16 times
d) Shift right by 4 bit
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13. For the following statement find the values generated for p and q?

int p = 0, q = 1;
p = q++;
p = ++q;
p = q--;
p = --q;

Value of p & q are

a) 1 1
b) 0 0
c) 3 2
d) 1 2
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14. What is the value of the following expression?

i = 1;
i = ( I< <= 1 % 2)

a) 2
b) 1
c) 0
d) Syntax error
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15. What is the correct and fully portable way to obtain the most significant byte of an unsigned integer x?

a) x & 0xFF00
b) x > > 24
c) x > > ( CHAR_BIT * (sizeof(int) - 3))
d) x > > ( CHAR_BIT * (sizeof(int) - 1))
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16. Expression x % y is equivalent to____?

a) (x – (x/y))
b) (x – (x/y) * y)
c) (y – (x/y))
d) (y – (x/y) * y)
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17. What is the value of x after executing the following statement?

int x = 011 | 0x10;

a) 13
b) 19
c) 25
d) 27
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18. What is the value of the following expression?

i = 1;
i < < 1 % 2;

a) 2
b) -2
c) 1
d) 0
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19. p++ executes faster than p + 1 since

a) P uses registers
b) Single machine instruction required for p++
c) Option a and b
d) None
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