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Accessing Struct Fields

After we have created a structure to describe a chemical element, we can finally interact with it.

In order to access the information contained in the structure, we must use the . operator.

The . operator allows us to access the elements (fields) of the structure directly.


python

This way we get access to a member of the structure.

Let's try to display information about silicon on the screen:

main


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#include "stdio.h"

struct chemicalElement
{
	char name[3];
	int atomicNumber;
	int valency;
	double mass;
};

int main()
{
	struct chemicalElement silicon = { "Si", 14, 4, 28.08 };

	printf("Name: %s\n", silicon.name); 
	printf("Atomic Number: %d\n", silicon.atomicNumber);
	printf("Valency: %d\n", silicon.valency);
	printf("Mass: %f", silicon.mass);

	return 0;
}

Note

Pointers are also widely used to access structure fields, but we'll cover that later.

If you used the second method of creating a struct-variable, you need to use the srtcopy() function to output silicon.name.

main


              123456789101112131415161718192021222324
            
#include "stdio.h"

struct chemicalElement
{
	char name[3];
	int atomicNumber;
	int valency;
	double mass;
} silicon;

int main()
{
	strcpy(silicon.name,"Si"); // using `strcpy()`
	silicon.atomicNumber = 14;
	silicon.valency = 4;
	silicon.mass = 28.08;

	printf("Name: %s\n", silicon.name);
	printf("Atomic Number: %d\n", silicon.atomicNumber);
	printf("Valency: %d\n", silicon.valency);
	printf("Mass: %f", silicon.mass);

	return 0;
}

Note

The strcpy() function is used to copy the specified (“Si”) string to the name[3] field of the created variable.

Uppgift

Swipe to start coding

Display the valence of natrium;
Display the atomic mass of aluminum;
Display the atomic number of zinc.

Lösning

Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 5

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Accessing Struct Fields

After we have created a structure to describe a chemical element, we can finally interact with it.

In order to access the information contained in the structure, we must use the . operator.

The . operator allows us to access the elements (fields) of the structure directly.


python

This way we get access to a member of the structure.

Let's try to display information about silicon on the screen:

main


              123456789101112131415161718192021
            
#include "stdio.h"

struct chemicalElement
{
	char name[3];
	int atomicNumber;
	int valency;
	double mass;
};

int main()
{
	struct chemicalElement silicon = { "Si", 14, 4, 28.08 };

	printf("Name: %s\n", silicon.name); 
	printf("Atomic Number: %d\n", silicon.atomicNumber);
	printf("Valency: %d\n", silicon.valency);
	printf("Mass: %f", silicon.mass);

	return 0;
}

Note

Pointers are also widely used to access structure fields, but we'll cover that later.

If you used the second method of creating a struct-variable, you need to use the srtcopy() function to output silicon.name.

main


              123456789101112131415161718192021222324
            
#include "stdio.h"

struct chemicalElement
{
	char name[3];
	int atomicNumber;
	int valency;
	double mass;
} silicon;

int main()
{
	strcpy(silicon.name,"Si"); // using `strcpy()`
	silicon.atomicNumber = 14;
	silicon.valency = 4;
	silicon.mass = 28.08;

	printf("Name: %s\n", silicon.name);
	printf("Atomic Number: %d\n", silicon.atomicNumber);
	printf("Valency: %d\n", silicon.valency);
	printf("Mass: %f", silicon.mass);

	return 0;
}

Note

The strcpy() function is used to copy the specified (“Si”) string to the name[3] field of the created variable.

Uppgift

Swipe to start coding

Display the valence of natrium;
Display the atomic mass of aluminum;
Display the atomic number of zinc.

Lösning

Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 5

Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan