Apptitude Tests MCQ Short Questions On Increment and Decrement Operators BlueJ

Increment and Decrement Operators

Give the output:

1. a+=++a-b-- + a+b where a=2 and b=6

a=a+ ++a-b-- + a+b

=2+3-6+3+5

=5-6+3+5

=13-6

=7

2. x=x++ + (++x)%5 where x=10

10+12%5

10+2

=12

3. m*=m+n++ + ++m where m=20 and n=15

m*=20+15 + 21

m*= 56

m=m*56

m=20*56

m=1120

4. q=(++q/p-- + q++)*p/4 where p=75 and q=90

(91/75+91)*74/4

(1+91)*74/4

=92*74/4

=6808/4

=1702

5. a+=--a + b*3 + c++ - ++b where a=2, b=3 and c=10

a+=1+3*3 + 10-4

a+=1+9+6

a+=16

a=a+16

a=2+16

a=18

6. z=(++y*(y++ + 5)) where z=10

=11*(11+6)

=11*17

7. a+=a++ + ++a + --a + a-- where a=7 

 a+=7+9+8+8

 a+=32

a=a+32

a=7+32

a=39

8. int i=0;

while(++i<10)

{

 System.out.print(" "+i);

}

Output: 1 2 3 4 5 6 7 8 9

9. int i=0;

while(i++<10)

{

  System.out.print(" "+i);

}

Output: 1 2 3 4 5 6 7 8 9 10

10. int i=0,j=10;

for(;++i<j-- )

{

System.out.print(i + “:”+j);

}

Output:

1 9

2 8

3 7

4 6

11. int a=10,b=5;

for(int i=0;i<10;i++)

{

 int c=a++ + --b;

System.out.print( c + “ “);

}

Output: 

14 14 14 14 14 14 14 14 14 14

12. a=16, b=-1

int a=5,b=6,c=7;

a*=a++ + ++a + b-- * ++c;

  =5 + 7+6*8

 =5+7+48

=60

a=a*60

    =5*60

=300

13. int a=10, b=11,c=12;

int d=a++ * a++ + ++b/c++ + c++;

=10*11+1+13

=110+14

=124

14. x=10

x=x++ + ++x%5

=10+12%5

=10+2

=12

15. int a=2,b=6;

a+=++a – b-- + a+b

      =3-6+3+5

=5

a=a+5

a=2+5

=7

16. int n=15, m=20

m*=m+ n++ + ++m;

       =20+15+21

      =56

m=m*56

m=20*56

=1120

17. int p=75, q=90

q=(++q/p--+q++)*p/4

=(91/75+91)*74/4

(1+91)*74/4

92*74/4

23*74

18. y=10

z=(++y*(y++ + 5))

   = 11*(11+5)

    =11*16

 = 176

19. a+=a++ + ++a + --a+a—

a=7

7+9+8+8

=32

a=a+32

a=7+32

=39

20. a=2,b=3,c=10

a+=--a+b*3+c++ - ++b;

       =1+9+10-4

=16

a=a+16

=2+16

=18