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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.

Opgave

Swipe to start coding

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

Løsning

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Sektion 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.

Opgave

Swipe to start coding

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

Løsning

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder

Var alt klart?

Tak for dine kommentarer!

Sektion 1. Kapitel 5

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder