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You can image the definition of two structure types, one for stock trades and one for bond trades:
/* Preliminary versions /*
struct stock_trade {double price; int number; int pe_ratio;};
struct bond_trade {double price; int number; double yield;};
As defined, bond_trade objects require 4 bytes more than
stock_trade objects, in most implementations, because the
floating-point number, yield, consumes 8 bytes, whereas the integer,
pe_ratio, consumes just 4 bytes.