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C Structs

bookArrays with Structs

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

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;
}
Oppgave

Swipe to start coding

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

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bookArrays with Structs

Sveip for å vise menyen

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

main.c

copy

              
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;
}
Oppgave

Swipe to start coding

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

Løsning

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Seksjon 3. Kapittel 4
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