C Programming - Expressions
Exercise "Time and tide wait for none."
- Alexander Pope
1.
Are the following two statement same?
1.
a <= 20 ? b = 30: c = 30;
2.
(a <=20) ? b : c = 30;
Answer: A
Explanation:
No, the expressions 1 and 2 are not same.
1. a <= 20 ? b = 30: c = 30; This statement can be rewritten as,
if(a <= 20)
{
b = 30;
}
else
{
c = 30;
}
2. (a <=20) ? b : c = 30; This statement can be rewritten as,
if(a <= 20)
{
//Nothing here
}
else
{
c = 30;
}
2.
Two different operators would always have different Associativity.
Answer: A
Explanation:
No, Two different operators may have same associativity.
Example : ++ , -- having Right-to-Left associativity.> , >= also have Left-to-Right associativity.
3.
Will the expression *p = p be disallowed by the compiler?
Answer: E
Explanation:
Because, here even though the value of p is accessed twice it is used to modify two different objects p and *p
4.
Every operator has an Associativity
Answer: E
Explanation:
Yes, Each and every operator has an associativity.
The associativity (or fixity) of an operator is a property that determines how operators of the same precedence are grouped in the absence of parentheses. Operators may be left-associative, right-associative or non-associative.
