Passing Structs to the Functions

              
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#include <stdio.h>

// structure definition
typedef struct {
    char name[50];
} Person;

// function to display information about a person
void printPerson(Person p) {
    printf("Name: %s\n", p.name);
}

int main() {
    // creating a structure and initializing its values
    Person person1 = {"John"};

    // call a function to display information about a person
    printPerson(person1);

    return 0;
} 

              
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#include <stdio.h>

// structure definition
typedef struct {
    char symbol;
}Example;

// function for changing the values of structure fields via a pointer
void changePoint(Example* ptr, int newSymbol)
{
    // check for NULL pointer
    if (ptr != NULL)
    {
        ptr->symbol = newSymbol;
    }
}

int main() {
    // create the Example structure and a pointer
    Example ptr1 = {'H'};
    Example* ptr = &ptr1;

    printf("Old symbol: %c | %p\n", ptr1.symbol, &ptr1);

    // use function to change the field of structures
    changePoint(ptr, 'y');

    printf("New symbol: %c | %p\n", ptr1.symbol, &ptr1);

    return 0;
} 

              
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#include <stdio.h>
#include <stdlib.h>

// structure definition
typedef struct {
    int value;
}Example;

// function creates a structure with the given field
Example* CreateStruct(int setVal)
{
    Example* ptr = (Example*)malloc(sizeof(Example));

    // check for successful memory allocation
    if (ptr != NULL)
    {
        ptr->value = setVal;
    }
    return ptr;
}

int main() 
{
    // use function to create structure 
    Example* ptrToStruct = CreateStruct(23);

    printf("Value inside struct: %d", ptrToStruct->value);

    free(ptrToStruct); // free memory

    return 0;
}