Charles Tritt / Mbed 2 deprecated StructPlay

Demonstration of some struct features and use.

Dependencies:   mbed

Fork of ArraySizeof by Charles Tritt

main.cpp@4:b36f0369c752, 2017-11-08 (annotated)

Committer:
CSTritt
Date:
Wed Nov 08 12:53:43 2017 +0000
Revision:
4:b36f0369c752
Parent:
3:45a53383e09f 
Changed (improved) siblings functions.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
CSTritt 0:8482415bf245 1 /*
CSTritt 3:45a53383e09f 2 Project: StructPlay
CSTritt 0:8482415bf245 3 File: main.cpp
CSTritt 0:8482415bf245 4 Ported to mbed/Nucleo by: Dr. C. S. Tritt
CSTritt 4:b36f0369c752 5 Last revised: 11/7/17 (v. 1.1)
CSTritt 1:987d0ca5cf9a 6
CSTritt 3:45a53383e09f 7 Demonstrates various struct usage. All of this code was taken from Horton
CSTritt 3:45a53383e09f 8 Chapter 11 and modified.
CSTritt 0:8482415bf245 9 */
CSTritt 0:8482415bf245 10 #include "mbed.h"
CSTritt 0:8482415bf245 11
CSTritt 3:45a53383e09f 12 struct Family {
CSTritt 3:45a53383e09f 13 char name[20];
CSTritt 3:45a53383e09f 14 int age;
CSTritt 3:45a53383e09f 15 char father[20];
CSTritt 3:45a53383e09f 16 char mother[20];
CSTritt 3:45a53383e09f 17 };
CSTritt 3:45a53383e09f 18 typedef struct Family Family;
CSTritt 3:45a53383e09f 19
CSTritt 3:45a53383e09f 20 // Declare the function.
CSTritt 3:45a53383e09f 21 bool siblings(Family member1, Family member2);
CSTritt 4:b36f0369c752 22 bool siblingsWP(Family const *pMember1, Family const *pMember2);
CSTritt 3:45a53383e09f 23
CSTritt 0:8482415bf245 24 int main(void)
CSTritt 0:8482415bf245 25 {
CSTritt 3:45a53383e09f 26 // Create a Horse structure.
CSTritt 3:45a53383e09f 27 struct Horse {
CSTritt 3:45a53383e09f 28 int age;
CSTritt 3:45a53383e09f 29 int height;
CSTritt 3:45a53383e09f 30 char name[20];
CSTritt 3:45a53383e09f 31 char father[20];
CSTritt 3:45a53383e09f 32 char mother[20];
CSTritt 1:987d0ca5cf9a 33 };
CSTritt 3:45a53383e09f 34 typedef struct Horse Horse;
CSTritt 3:45a53383e09f 35 Horse trigger = {
CSTritt 3:45a53383e09f 36 .name = "Trigger", .mother = "Wesson", .father = "Smith"
CSTritt 3:45a53383e09f 37 };
CSTritt 3:45a53383e09f 38 trigger.age = 30;
CSTritt 3:45a53383e09f 39 trigger.height = 15;
CSTritt 1:987d0ca5cf9a 40
CSTritt 3:45a53383e09f 41 printf("Trigger's old mom: %s.\n", trigger.mother);
CSTritt 3:45a53383e09f 42 strcpy(trigger.mother, "Crisco"); // Size should be checked!
CSTritt 3:45a53383e09f 43 printf("Trigger's new mom: %s.\n", trigger.mother);
CSTritt 1:987d0ca5cf9a 44
CSTritt 3:45a53383e09f 45 Horse myHorse; // Structure variable declaration.
CSTritt 3:45a53383e09f 46
CSTritt 3:45a53383e09f 47 // Initialize the structure variable from entered data.
CSTritt 3:45a53383e09f 48 printf("Turn local echo on!\n" );
CSTritt 3:45a53383e09f 49 printf("Enter the name of the horse: " );
CSTritt 3:45a53383e09f 50 scanf("%s", myHorse.name); // Read the name. Dangerous.
CSTritt 3:45a53383e09f 51 printf("Name set to: %s.\n", myHorse.name);
CSTritt 3:45a53383e09f 52
CSTritt 3:45a53383e09f 53 printf("How old is %s? ", myHorse.name );
CSTritt 3:45a53383e09f 54 scanf("%d", &myHorse.age ); // Read the age.
CSTritt 3:45a53383e09f 55 printf("Age set to: %d.\n", myHorse.age);
CSTritt 3:45a53383e09f 56
CSTritt 3:45a53383e09f 57 Horse* pHorse = NULL;
CSTritt 3:45a53383e09f 58 Horse aHorse = { 3, 11, "Jimbo", "Trigger", "Nellie"};
CSTritt 3:45a53383e09f 59 pHorse = &aHorse;
CSTritt 3:45a53383e09f 60 printf("A horse's name is %s.\n", (*pHorse).name);
CSTritt 3:45a53383e09f 61 printf("Same horse's name is %s.\n", pHorse->name);
CSTritt 3:45a53383e09f 62
CSTritt 3:45a53383e09f 63 Family newKid = {"Joe", 5, "Bill", "Mary"};
CSTritt 3:45a53383e09f 64 Family oldKid = {"Jane", 15, "Bob", "Mary"};
CSTritt 1:987d0ca5cf9a 65
CSTritt 3:45a53383e09f 66 if (siblings(newKid, oldKid)) printf("They are!\n");
CSTritt 3:45a53383e09f 67 if (siblingsWP(&newKid, &oldKid)) printf("They are too!\n");
CSTritt 3:45a53383e09f 68
CSTritt 3:45a53383e09f 69 while (true) wait(3600.0f); // Loop forever when done.
CSTritt 3:45a53383e09f 70 }
CSTritt 3:45a53383e09f 71
CSTritt 3:45a53383e09f 72 bool siblings(Family member1, Family member2) // Define the function.
CSTritt 3:45a53383e09f 73 {
CSTritt 4:b36f0369c752 74 bool maternal = strcmp(member1.mother, member2.mother);
CSTritt 4:b36f0369c752 75 bool paternal = strcmp(member1.father, member2.father);
CSTritt 4:b36f0369c752 76 return maternal || paternal;
CSTritt 3:45a53383e09f 77 }
CSTritt 3:45a53383e09f 78
CSTritt 4:b36f0369c752 79 // Passing pointers to large structs can save time and memory.
CSTritt 4:b36f0369c752 80 bool siblingsWP(Family const *pMember1, Family const *pMember2)
CSTritt 3:45a53383e09f 81 {
CSTritt 4:b36f0369c752 82 // const refers to changing field content.
CSTritt 4:b36f0369c752 83 bool maternal = strcmp(pMember1->mother, pMember2->mother);
CSTritt 4:b36f0369c752 84 bool paternal = strcmp(pMember1->father, pMember2->father);
CSTritt 4:b36f0369c752 85 return maternal || paternal;
CSTritt 0:8482415bf245 86 }