在不使用任何分号的情况下编写 function

Question

I have a very strange problem in my homework. So I have to build a function which calculates the sum/difference of two numbers.

It looks fairly easy but there's a catch.

This is the function:

void sumdif()
{
int result = 0;
//input
//output
}

I can't use any semicolons, and this is how the function must look.

Input consists of: number, + or - (depending if you want to substract or to add) and another number.

The function will output the result.

If I could use semi-colons, it would've been easy. I have no idea how to resolve this problem in this case, though.

I've thought about using a ternary operator. Unfortunately, I can't see how to take input, output and also differentiate + and - in one line. (and I think I needed ";" anyway so it wouldn't help me).

Here's the problem: https://www.pbinfo.ro/?pagina=probleme&id=3191

Unfortunately, it is in romanian. You can use google translate for more details, but I've explained the idea.

Through that function you take input, then output the result, and more than that you can't use any semicolon. (this is the hardest part for me - I've never dealt with this before)

How can this problem be solved?

Answer 1

Just performs the operations inside the if condition like in the following:

void sumdif()
{
    if (char c = '+') { //declare c
        if (cin >> c) { //read c
            if (int a = 1) { //declare a
                if (cin >> a) { //read a
                    if (int b = 1) { //declare b
                        if (cin >> b) { //read b
                            if (c == '+') { //choose operation
                                if (cout << (a + b)) { //print sum
                                }
                            }
                            else {
                                if (cout << (a - b)) { //print difference
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

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