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my $var;
$var = 0;
...
$var = 0;
$var ||= 30;
print "2. var=$var\n";

1. var=30
2. var=30

int var = 0;
var = var || 30;
printf("1. var=%d\n", var);
// var ||= 30;     // oops, syntax error in C++

1. var=1