Can anybody explain this program?

Question

#include<stdio.h>

int main()

{

    int a=0;

    a=a++ + a++ - a++ + ++a;

    printf("%d\n", a);

    return 0;

}

Answer 1

int a=0; //Declare "a" and initialize it to 0

a=a++ + a++ - a++ + ++a;

•++a : First increment, then use it
•a++ : Use the value, then increment

So...
a = 0 + 1 - 2 + 4

printf("%d\n", a); //prints 3 + line break