What does this printf do? Not familiar with the question mark, colon, and extra NULL at the end.
printf("%s ", row[i] ? row[i] : "NULL");
That format is called a ternary operator. It's a version of an if/else statement.
row[i] ? row[i] : "NULL"
is the same as
if(row[i]) {
// use value row[i]
} else {
// use value "NULL"
}
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