Question

what will be the result of ++m- --n+m++ if m=9 and n=5

Answer 1

Answer:

What will be the values of x, m, and n after execution of the following statements? Int x, m, n; m = 10; n = 15; x = ++m + n++.

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According to the theories in textbooks, answer for this expression would be 26.

Pre-increment (++m) is performed and is reflected immediately in the expression.

So, new value of m = 11.

Post-increment is performed but is not immediately reflected in the same expression, but in the lines immediately following it.

So, n = 15.

Therefore x = 11+15 =26.

If there is a line immediately following the given expression, for instance,

x = ++m + n++;

y = m+n;

Now, the value of y would be 11+16 = 27.

But, practically, this may fail in different compilers and result in undefined behaviour.

The above one will surely work in Turbo C/C++.