Please follow explain how these codes outputs these answers in detail (c++)

#include using namespace std; int main (void) {int d2, d3; for (d3 = 2; d3 >= 1; d3--) {for (d2 = 2; d2 >= 1; d2--) {cout using namespace std; int main() {int a (-4), b (7); a = b/a + a--; cout