关于#c++#的问题，请各位专家解答！

#include <stdio.h>
main( )
{
int a=1, b=-2;
for (; a--&& b++;)
printf(" %d,%d,", a,b);
printf(" %d,%d", a,b);}

#include <stdio.h>
int main()
{
    int a = 1, b = -2;
    for (; a-- && b++;)
        printf(" %d,%d,", a, b);
    printf(" %d,%d", a, b);
    return 0;
}