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 herefootball_league_c.txt

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);
 }
}

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