CODEWITHSUNDEEP
c++syntaxexpression
Sam Piastry
Sam Piastry

Reputation: 39

Colon if statement difference

How are these two lines of statement different ? 

a<=20? b=30: c= 30;
(a<=20)?b:c = 30;

If i give a value of a = 20 then

First line gives b = 20 , c =0 Second line gives b = 0 , c = 0

Not an assignment question.

Upvotes: 0

Views: 2765

Answers (2)

sp2danny
sp2danny

Reputation: 7644

operator precedence:
this:

(a<=20)?b:c = 30;

is interpreted as:

(a<=20) ? (b) : (c=30) ;

you probably want

((a<=20)?b:c) = 30;

Upvotes: 1

songyuanyao
songyuanyao

Reputation: 172924

According to the rule of ternary conditional operator,

a<=20? b=30: c= 30; is same as:

if (a <= 20) {
    b = 30;
} else {
    c = 30;
}

and (a<=20)?b:c = 30; is same as:

if (a <= 20) {
    b;
} else {
    c = 30; 
}

So the difference between case#1 and case#2 is whether b get setted when the condition is true.

Upvotes: 1

Related Questions