Evaluating expressions – Computer Sir Ki Class


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Solved Problem #CPP#5358    siteicon   siteicon  

Problem Statement - Evaluating expressions

What will be the value of c after evaluating the given expressions on the left side for following two set of statements. Also justify your answer

(i)  int j=5; int c=(5*++j)%6;
(ii) int j=5; int c=(5*j++)%6;


TC++ #5358

Run Output


(i) int j=5; int c=(5*++j)%6;
this will evaluate as follows
(5*6)%6   //prefix increment will make j as 6
(30)%6    //Modulus operator will calculate remainder of division 30/6
0               //Remainder will be 0

(ii) int j=5; int c=(5*j++)%6;
this will evaluate as follows
(5*5)%6   //postfix increment will not increment j in this instruction
(25)%6    //Modulus operator will calculate remainder of division 25/6
1               //Remainder will be 1

Common Errors

  • Student often confuse between prefix and postfix operators. Just remember that in prefix operator computation happens after incrementing and in postfix operator computation happens and then incrementing is done.


CSKC| Created: 9-Dec-2018 | Updated: 9-Dec-2018|

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