C code - 8 lines

Link:

C, pasted on Oct 21:

#include<stdio.h>
int main() {
    int a = 1;
    printf("a=%d\n",a+a++);
    a = 1;
    printf("a=%d\n",a+a+a++);
    return 0;
}

Output:

1
2

a=2
a=3