+ 2

Can anybody explane me?

Int a=0,b=0; While(a<7,b<17) A++; B++; Printf("%d%d",a,b);

29th Nov 2018, 4:45 AM
Viren
Viren - avatar
3 Answers
+ 5
int a = 0, b = 0; // while ( (evaluted, then discarded) , (evaluated, then returned)) while ( a<7, b<17 ) { // comma operator ¹ a++; b++; printf("%d %d\n", a, b); } Output: 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 _____ ¹ The comma operator expression has the form lhs , rhs where lhs - any expression rhs - any expression other than another comma operator (in other words, comma operator's associativity is left-to-right) First, the left operand, lhs, is evaluated and its result value is discarded. Then, a sequence point takes place, so that all side effects of lhs are complete. Then, the right operand, rhs, is evaluated and its result is returned by the comma operator as a non-lvalue. https://en.cppreference.com/w/c/language/operator_other#Comma_operator
29th Nov 2018, 5:22 AM
Babak
Babak - avatar
+ 2
Thank you all
29th Nov 2018, 6:08 AM
Viren
Viren - avatar
+ 1
It is a code of implementation. So when a and b will take a number who overtake 7, it will be added 1 to a and b
29th Nov 2018, 4:58 AM
Kesly-Lionel DADE
Kesly-Lionel DADE - avatar