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Unfortunately, when you try to define industry_name, using
display_industry_name as a model, you do not know what the
return type should be:
what type here? industry_name (struct trade *t) {
switch (t -> industry) {
case food: return "Food"; break;
case trucking: return "Trucking"; break;
case computers: return "Computers"; break;
case metals: return "Metals"; break;
case health: return "Health"; break;
case airline: return "Airline"; break;
default: return "Unknown"; break;
}
}
Accordingly, it is time for you to learn about character strings.