Example Program Help

Hello everyone,

I came across this example program whilst reading my C programming dummies guide that i dont understand.

I was wondering if anyone could explain it to me

I know roughly all of the terminology so all technical terms are fine its just im not sure what each bit does hereAttachment 12458

Thanks in advance

well tell us what parts you dont understand?

Code:

---

#include <stdio.h>
#include <string.h>
#define NOOFTEAMS 10
#define STRINGLENGTH 30
#define NOOFGAMES 90
struct team
{
 char teamName[STRINGLENGTH];
 int points;
 int noOfGames;
 int matchesPlayed[90];
};
struct leagueTable
{
 int noOfTeams;
 struct team lgTbl[NOOFTEAMS];
};
struct game
{
 char homeTeam[STRINGLENGTH];
 char awayTeam[STRINGLENGTH];
 int homeGoals;
 int awayGoals;
};
struct matchesTable
{
 int noOfGames;
 struct game mtchTbl[NOOFGAMES];
};
 
int displayMenu(void);
struct leagueTable initialise(struct leagueTable leagueTeam);
struct leagueTable doAction(int option, struct leagueTable leagueTeam);
struct matchesTable addMatch(struct matchesTable teamGame);
void showHistory(struct matchesTable teamGame);
void displayAll(struct leagueTable leagueTeam);
int main(void)
{
 struct leagueTable leagueTeam;
 int option;
 
 leagueTeam.noOfTeams = initialise(leagueTeam);
 while((option = displayMenu()) !=4)
 {
  leagueTeam = doAction(option, leagueTeam);
 } 
 
 return 0;
}
struct leagueTable initialise(struct leagueTable leagueTeam)
{
 struct leagueTable leagueTeam;
 char teamName[NOOFTEAMS][STRINGLENGTH];
 int count;
 
 leagueTeam.noOfTeams = 0;
 
 for(count = 0; count < NOOFTEAMS; count++)
 {
  printf("Enter team name: ");
  gets(teamName[count]);
  fflush(stdin);
 };
 
 return leagueTeam;
}
int displayMenu(void)
{
 int option;
 
 printf("\n\nFootball League Program\n\n");
 printf("1\tAdd Match\n");
 printf("2\tShow History\n");
 printf("3\tShow League\n");
 printf("4\tExit\n\n");
 printf("Select: ");
 while(scanf("%d", &option) !=1 || option < 1 || option > 4)
 {
  fflush(stdin);
  printf("ERROR - MUST be number 1 to 3: ");
 }
 fflush(stdin);
 
 return option;
}
struct leagueTable doAction(int option, struct leagueTable leagueTeam)
{
 switch(option)
 {
  case 1 : leagueTeam = addMatch(leagueTeam);
  break;
  case 2 : showHistory(leagueTeam);
  break;
  case 3 : displayAll(leagueTeam);
  break;
 }
 return leagueTeam;
}

struct matchesTable addMatch(struct matchesTable teamGame)
{
 struct team leagueTeam
 
 printf("Enter home team name: ");
 gets(teamGame.mtchTbl[teamGame.noOfGames].homeTeam);
 fflush(stdin);
 printf("Enter away team name: ");
 gets(teamGame.mtchTbl[teamGame.noOfGames].awayTeam);
 fflush(stdin);
 printf("Enter home team goals scored: ");
 scanf("%d", &teamGame.mtchTbl[teamGame.noOfGames].homeGoals);
 fflush(stdin);
 printf("Enter away team goals scored: ");
 scanf("%d", &teamGame.mtchTbl[teamGame.noOfGames].awayGoals);
 fflush(stdin);
 
 if(teamGame.mtchTbl[teamGame.noOfGames].homeGoals > teamGame.mtchTbl[teamGame.noOfGames].awayGoals)
 {
  leagueTeam.lgTbl[leagueTeam.noOfTeams].points + 2;
 }
 else if(teamGame.mtchTbl[teamGame.noOfGames].homeGoals < teamGame.mtchTbl[teamGame.noOfGames].awayGoals)
 {
  leagueTeam.lgTbl[leagueTeam.noOfTeams].points - 1;
 }
 else if(teamGame.mtchTbl[teamGame.noOfGames].homeGoals == teamGame.mtchTbl[teamGame.noOfGames].awayGoals)
 {
  leagueTeam.lgTbl[leagueTeam.noOfTeams].points + 1;
 }
 else
 {
  (printf"work out how to show points +3");
 }
 
 
 teamGame.noOfGames++;
 
 return teamGame;
}
void showHistory(struct matchesTable teamGame)
{
 int indx;
 
 printf("Enter team name for history search: ");
 gets(teamGame.mtchTbl[teamGame.noOfGames].homeTeam);
 
 for(indx = 0; indx < teamGame.noOfGames; indx++)
 {
  printf("\nAway Team: %s", teamGame.mtchTbl[teamGame.noOfGames].awayTeam);
  printf("\nHome goals scored %d", &teamGame.mtchTbl[teamGame.noOfGames].homeGoals);
  printf("\nAway goals scored %d", teamGame.mtchTbl[teamGame.noOfGames].awayGoals);
 } 
}
void displayAll(struct leagueTable leagueTeam)
{
 int indx;
 
 for(indx = 0; indx < leagueTeam.noOfTeams; indx++)
 {
  printf("\n%s", leagueTeam.lgTbl[indx].teamName);
  printf("\n%d", leagueTeam.lgTbl[indx].noOfGames);
  printf("\n%d", leagueTeam.lgTbl[indx].points);
 }
}

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The sample program is probably not a good idea to study -

It uses fflush(stdin)
FAQ > Why fflush(stdin) is wrong - Cprogramming.com

and gets()
FAQ > Why gets() is bad / Buffer Overflows - Cprogramming.com

I understand the fact there is a struct for team and i understand how the menu works but I really dont get why there is a struct for league and why there is a struct for matchestable, also I dont see why matches played has an array of 90 when i think that should be in noofgames. I dont get what the purpose of the functions are like what are they passing/returning? Basically I am confused by the whole thing