Lära Arrays with Structs | Structs and Memory

Creating an array from structures is no different from creating an array with other data types.

Accessing the elements of such an array is similar to that of ordinary arrays by indexes.

struct Person {
    char name[50];
    int age;
    double height;
};

struct Person people[2];

As an example, let's create an array of structures that will store information about a person.

main.c


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#include <stdio.h>
#include <string.h> // for the strcpy function

// structure definition
struct Person {
    char name[50];
    int age;
    double height;
};

int main() {
    // declaring an array of structures
    struct Person people[3];

    // declaring an array of structures
    strcpy(people[0].name, "Alice");
    people[0].age = 25;
    people[0].height = 1.75;

    strcpy(people[1].name, "Bob");
    people[1].age = 30;
    people[1].height = 1.80;

    strcpy(people[2].name, "Charlie");
    people[2].age = 35;
    people[2].height = 1.70;

    // output information about people from the array
    for (int i = 0; i < 3; ++i) {
        printf("Person %d:\n", i + 1);
        printf("Name: %s\n", people[i].name);
        printf("Age: %d\n", people[i].age);
        printf("Height: %.2f\n", people[i].height);
        printf("\n");
    }

    return 0;
}

Uppgift

Swipe to start coding

Initialize a variable that will indicate the number of structures to be created;
Create a pointer variable and place in it the address of an allocated memory location for a given number of structures in the array.
Write code to autofill a dynamically created array with numbers from 0 to a number indicating the number of structures;
Display the fields of all created structures in an array;
Free allocated memory.

Lösning

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Avsnitt 3. Kapitel 4

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Creating an array from structures is no different from creating an array with other data types.

Accessing the elements of such an array is similar to that of ordinary arrays by indexes.

struct Person {
    char name[50];
    int age;
    double height;
};

struct Person people[2];

As an example, let's create an array of structures that will store information about a person.

main.c


              1234567891011121314151617181920212223242526272829303132333435363738
            
#include <stdio.h>
#include <string.h> // for the strcpy function

// structure definition
struct Person {
    char name[50];
    int age;
    double height;
};

int main() {
    // declaring an array of structures
    struct Person people[3];

    // declaring an array of structures
    strcpy(people[0].name, "Alice");
    people[0].age = 25;
    people[0].height = 1.75;

    strcpy(people[1].name, "Bob");
    people[1].age = 30;
    people[1].height = 1.80;

    strcpy(people[2].name, "Charlie");
    people[2].age = 35;
    people[2].height = 1.70;

    // output information about people from the array
    for (int i = 0; i < 3; ++i) {
        printf("Person %d:\n", i + 1);
        printf("Name: %s\n", people[i].name);
        printf("Age: %d\n", people[i].age);
        printf("Height: %.2f\n", people[i].height);
        printf("\n");
    }

    return 0;
}

Uppgift

Swipe to start coding

Initialize a variable that will indicate the number of structures to be created;
Create a pointer variable and place in it the address of an allocated memory location for a given number of structures in the array.
Write code to autofill a dynamically created array with numbers from 0 to a number indicating the number of structures;
Display the fields of all created structures in an array;
Free allocated memory.

Lösning

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Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 4

single

Arrays with Structs

Lösning

Awesome!

Arrays with Structs

Lösning

Awesome!