Question

An
is a sequence of
operators and operands.
Select from the Answers below
Example
Information
Expression
Increment​

Answer 1

Answer:

Increment (Decrement) operators require L-value Expression

What will be the output of the following program?

#include<stdio.h>

int main()

{

int i = 10;

printf("%d", ++(-i));

return 0;

}

A) 11 B) 10 C) -9 D) None

Answer: D, None – Compilation Error.

Explanation:

In C/C++ the pre-increment (decrement) and the post-increment (decrement) operators require an L-value expression as operand. Providing an R-value or a const qualified variable results in compilation error.

In the above program, the expression -i results in R-value which is operand of pre-increment operator. The pre-increment operator requires an L-value as operand, hence the compiler throws an error.