Programming

Question

#include<stdio.h> 
int main() 
{ 
    int i, j, k;
    i = 5; 
    j = ++i;
    i = j--;
    k = (i+j)++;
    printf("%d",k);
}

What will be the output of the above program?

(A) 11
(B) 12
(C) Compilation error
(D) None of the above

Answer 1

error: lvalue required as increment operand
     k = (i+j)++;

An lvalue refers to an object that persists beyond a single expression. Lvalue is an object that has a name. All variables, including nonmodifiable (const) variables, are lvalues.

This means (i+j) it's just a value; it doesn't point (refer) to a particular object (or variable) and so trying to change it generates compiler error.

More on this : http://stackoverflow.com/questions/6230274/lvalue-required-as-increment-operand-error