Anonymous Struct and Union
The C programming language has anonymous structures and unions, which provide the ability to define structures and unions without specifying a name.
// Anonymous union example
union
{
char x;
int y;
};
// Anonymous structure example
struct
{
char x;
int y;
};
Since there are no names, direct objects (or variables) are not created from them we use them as nested structures or unions.
You can use anonymous structs/unions when they are nested and will only be used where they are declared.
main.c
123456789101112131415161718192021222324#include <stdio.h> struct ASCIItable { // Anonymous union union { char symbol; int num; }; }; int main() { struct ASCIItable AZtable; AZtable.num = 65; // number 65 is first symbol `A`, // number 97 is last `Z` symbol, hence 97 - 65 = 25, // so 26 iterations required (including number 0) for (int i = 0; i < 26; i++) printf("x.num = %d | x.symbol = `%c`\n", AZtable.num + i, AZtable.symbol + i); return 0; }
Note
Union allows the same set of bits to be represented differently depending on the context. For example, in an
ASCIItablestructure, you can interpret the same value as a character (usingsymbol) or as a numeric value (usingnum). This can be useful when you need to quickly switch between different data views.
Swipe to start coding
- Create an anonymous structure;
- Declare three float fields in it with the names
x,y,radius; - Define the fields of the structure instance;
- Display the values of the structure fields.
Soluzione
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Can you give an example of using an anonymous struct or union inside another struct?
What are the advantages and disadvantages of using anonymous structs and unions?
How do you access the members of an anonymous struct or union when they are nested?
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The C programming language has anonymous structures and unions, which provide the ability to define structures and unions without specifying a name.
// Anonymous union example
union
{
char x;
int y;
};
// Anonymous structure example
struct
{
char x;
int y;
};
Since there are no names, direct objects (or variables) are not created from them we use them as nested structures or unions.
You can use anonymous structs/unions when they are nested and will only be used where they are declared.
main.c
123456789101112131415161718192021222324#include <stdio.h> struct ASCIItable { // Anonymous union union { char symbol; int num; }; }; int main() { struct ASCIItable AZtable; AZtable.num = 65; // number 65 is first symbol `A`, // number 97 is last `Z` symbol, hence 97 - 65 = 25, // so 26 iterations required (including number 0) for (int i = 0; i < 26; i++) printf("x.num = %d | x.symbol = `%c`\n", AZtable.num + i, AZtable.symbol + i); return 0; }
Note
Union allows the same set of bits to be represented differently depending on the context. For example, in an
ASCIItablestructure, you can interpret the same value as a character (usingsymbol) or as a numeric value (usingnum). This can be useful when you need to quickly switch between different data views.
Swipe to start coding
- Create an anonymous structure;
- Declare three float fields in it with the names
x,y,radius; - Define the fields of the structure instance;
- Display the values of the structure fields.
Soluzione
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