This is an easy thing to determine:

sub true1 {
  print "true1\n";
  1;
}

sub true2 {
  print "true2\n";
  1;
}

sub false1 {
  print "false1\n";
  0;
}

sub false2 {
  print "false2\n";
  0;
}

if ( true1() && true2() ) {
  print "all true\n";
}

if ( false1() || false2() ) {
  print "somethings wrong with the universe!\n";
}

# Not tested but should output:
true1
true2
all true
false1
false2
[download]