What will be printed out as a result of the program execution?
#include <iostream>

void func(int a, int b, int c, int d)
   std::cout << a << b << c << d;

int main()
   int a = 0;
   func(++a, a++, ++a, a++);
   return 0;
The order of calculating the arguments passed into the function is not defined. That's why the result of this code execution is undefined behavior. You may read the details here: Sequence point.

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