File content as of revision 4:b36f0369c752:

/*
    Project: StructPlay
    File: main.cpp
    Ported to mbed/Nucleo by: Dr. C. S. Tritt
    Last revised: 11/7/17 (v. 1.1)

    Demonstrates various struct usage. All of this code was taken from Horton 
    Chapter 11 and modified.
*/
#include "mbed.h"

struct Family {
    char name[20];
    int age;
    char father[20];
    char mother[20];
};
typedef struct Family Family;

// Declare the function.
bool siblings(Family member1, Family member2); 
bool siblingsWP(Family const *pMember1, Family const *pMember2);

int main(void)
{
    // Create a Horse structure.
    struct Horse {
        int age;
        int height;
        char name[20];
        char father[20];
        char mother[20];
    };
    typedef struct Horse Horse;
    Horse trigger = {
        .name = "Trigger", .mother = "Wesson", .father = "Smith"
    };
    trigger.age = 30;
    trigger.height = 15;
    
    printf("Trigger's old mom: %s.\n", trigger.mother);
    strcpy(trigger.mother, "Crisco"); // Size should be checked!
    printf("Trigger's new mom: %s.\n", trigger.mother);
    
    Horse myHorse; // Structure variable declaration.

    // Initialize the structure variable from entered data.
    printf("Turn local echo on!\n" );
    printf("Enter the name of the horse: " );
    scanf("%s", myHorse.name); // Read the name. Dangerous.
    printf("Name set to: %s.\n", myHorse.name);

    printf("How old is %s? ", myHorse.name );
    scanf("%d", &myHorse.age ); // Read the age.
    printf("Age set to: %d.\n", myHorse.age);

    Horse* pHorse = NULL;
    Horse aHorse = { 3, 11, "Jimbo", "Trigger", "Nellie"};
    pHorse = &aHorse;
    printf("A horse's name is %s.\n", (*pHorse).name);
    printf("Same horse's name is %s.\n", pHorse->name);
    
    Family newKid = {"Joe", 5, "Bill", "Mary"};
    Family oldKid = {"Jane", 15, "Bob", "Mary"};
    
    if (siblings(newKid, oldKid)) printf("They are!\n");
    if (siblingsWP(&newKid, &oldKid)) printf("They are too!\n");

    while (true) wait(3600.0f); // Loop forever when done.
}

bool siblings(Family member1, Family member2) // Define the function.
{
    bool maternal = strcmp(member1.mother, member2.mother);
    bool paternal = strcmp(member1.father, member2.father);
    return maternal || paternal;
}

// Passing pointers to large structs can save time and memory.
bool siblingsWP(Family const *pMember1, Family const *pMember2)
{
    // const refers to changing field content.
    bool maternal = strcmp(pMember1->mother, pMember2->mother);
    bool paternal = strcmp(pMember1->father, pMember2->father);
    return maternal || paternal;
}