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We can use these facilities to guard against multiple inclusion as follows

KasimKamal
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2022-07-03
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We can use these facilities to guard against multiple inclusion as follows.

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KasimKamal
2022-07-03
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#ifndef SALES_DATA_H
#define SALES_DATA_H
#include <string>
struct Sales_data {
std::string bookNo;
unsigned units_sold = 0;
double revenue = 0.0;
};
#endif

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