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#include <stdio.h>
int main()
{
    int i = 3;
    printf("%d", (++i)++);
    return 0;
}
What is the output of the above program?
  • a)
    3
  • b)
    4
  • c)
    5
  • d)
    Compile-time error
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
#include <stdio.h>int main(){ int i = 3; printf("%d"...


Explanation:

- The code provided will result in a compile-time error.

- In C language, the expression `++i` increments the value of `i` by 1 and returns the updated value of `i`.

- However, the expression `(++i)++` is attempting to increment a value that is not an lvalue (i.e., it cannot be modified).

- In other words, the result of the `++i` expression is not a variable or a memory location that can be modified.

- Therefore, trying to apply the `++` operator to the result of `++i` is invalid and will result in a compile-time error.

- This is because the `++` operator can only be applied to variables or lvalues, not to the result of an expression.

- As a result, the code will not compile and a compile-time error will be generated.
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Community Answer
#include <stdio.h>int main(){ int i = 3; printf("%d"...
In C, prefix and postfix operators need l-value to perform operation and return r-value. The expression (++i)++ when executed increments the value of variable i(i is a l-value) and returns r-value. The compiler generates the error(l-value required) when it tries to post-incremeny the value of a r-value.
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