A+B using C++ language

Question

I'm golfing a program to sum two numbers in C++.

Example:

10 3
13

I found out that this problem can be solved in 54 symbols (without spaces and so on) using C++. My code (63 symbols):

#include <iostream>
main() {
    int a, b;
    std::cin >> a >> b;
    std::cout << a + b;
}

I have no idea how to make my program shorter. Can you help me, please?

Answer 1

48 bytes

How about...

#include<cstdlib>
main(){system("tr \\  +|bc");}

...not using C++?

---

• The call to system runs commands on your shell (<cstdlib> declares system).
• tr \\ + executes the command tr, translating spaces to + (so the input34 45 becomes 34+45).
• | pipes tr's STDOUT into bc's STDIN.
• bc performs equations in STDIN and prints the result to STDOUT.