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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");
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Member Avatar for hericles

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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