なぜ、 'main'の前に '宣言指定子が期待されている'と言うのですか？

Question

まず、このプログラムの中で、この本からコピーしたものはすべて理解しています。それが働いていた場合
二つ目は、私はちょうど、
唯一の問題は、これは本当に長いプログラムです
PSを意味するもの、それはメイン「『 』の前に宣言指定子を期待」と言っていると私にはわからないということです見てみたかったです（300+ライン）

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

#define FALSE 0 
#define TRUE 1 

void printGreeting(); 
int getBet(); 
char getSuit(int suit); 
char getRank(int rank); 
void getFirstHand(int cardRank[], int cardSuit[]); 
void getFinalHand 
(int cardRank[], int cardSuit[], int finalRank[], int finalSuit[], int 
ranksinHand[], int suitsinHand[]) 
int analyzeHand(int ranksinHand[], int suitsinHand[]); 


main() 
{ 
int bet; 
int bank = 100; 
int i; 
int cardRank [5]; 
int cardSuit [5]; 
int finalRank[5]; 
int finalSuit[5]; 
int ranksinhand[13]; 
int suitsinhand[4]; 
int winnings; 
time_t t; 
char suit, rank, stillPlay; 


printGreeting(); 


do{ 
    bet = getBet(); 
    srand(time(&t)); 
    getFirstHand(cardRank, cardSuit); 
    printf("Your five cards: \n\n"); 
    for (i = 0; i < 5; i++) 
    { 
     suit = getSuit(cardsSuit[i]); 
     rank = getRank(cardRank[i]); 
     printf("Card #%d: %c%c\n\n", i+1, rank, suit); 
    } 

    for (i=0; i < 4; i++) 
    { 
     suitsinHand[i] = 0; 
    } 
    for (i=0; i < 13; i++) 
    { 
     ranksinHand[i] = 0; 
    } 

    getFinalHand(cardRank, cardSuit, finalRank, finalSuit, ranksinHand, 
    suitsinHand); 

    printf("Your five final cards:\n\n"); 
    for (i = 0; i < 5; i++) 
    { 
     suit = getSuit(finalSuit[i]); 
     rank = getRank(finalRank[i]); 
     printf("Card #%d: %c%c\n\n", i+1, rank, suit); 
    } 

    winnings = analyzeHand(ranksinHand, suitsinHand); 
    printf("You won %d!\n\n", bet*winnings); 
    bank = bank - bet + (bet*winnings) 
    printf("\n\nYour bank is now %d.\n\n", bank); 
    printf("Want to play again? "); 
    scanf(" %c", &stillPlay); 
}while (toupper(stillPlay) == 'Y'); 



return; 
} 

/*************************************************************************/ 


void printGreeting(); 
{ 

printf("**********************************************************\n\n"); 
printf("\n\n\tWelcome to the Absolute Beginner's Casino\n\n"); 
printf("\tHome of the Video Draw Poker"); 
printf("**********************************************************\n\n"); 

printf("Here are the rules\n"); 
printf("You start with 100 credits, and you make a bet from"); 
printf("1 to 5 credits.\n"); 
printf("You are dealt 5 cards, and then you choose which "); 
printf("cards to keep"); 
printf("or discard\n"); 
printf("You want to make the best possible hand.\n"); 
printf("\nHere is the table for winnings (assuming a "); 
printf("bet of 1 credit):"); 
printf("\nPair \t\t\t\t1 credit"); 
printf("\nTwo pairs\t\t\t2 credits"); 
printf("\nThree of a kind\t\t\t3 credits"); 
printf("\nStraight \t\t\t4 credits"); 
printf("Flush\t\t\t\t5 credits"); 
printf("Full House\t\t\t8 credits"); 
printf("Four of a Kind\t\t\t10 credits"); 
printf("Straight Flush\t\t\t20 credits"); 
printf("\n\nHave fun!!\n\n"); 
} 


void getFirstHand(int cardRank[], int cardSuit[]); 
{ 
int i,j; 
int carDup; 

for(i=0; i < 5; i++) 
{ 
    carDup = 0; 
    do{ 
     cardRank[i] = (rand() % 13); 
     cardSuit[i] = (rand() % 4); 

     for (j=0; j < i; j++) 
     { 
      if ((cardRank[i] == cardRank[j] && 
       cardSuit[i] == cardSuit[j])) 
      { 
       carDup = 1; 
      } 
     } 
    }while (carDup == 1;); 
} 
} 

char getSuit(int suit) 
{ 
switch 
{ 
    case 0: 
     return('C'); 
    case 1: 
     return('D'); 
    case 2: 
     return('H'); 
    case 3: 
     return('S'); 
} 
} 

char getRank(int rank) 
{ 
switch (rank) 
{ 
    case 0: 
     return('A'); 
    case 1: 
     return('2'); 
    case 2: 
     return('3'); 
    case 3: 
     return('4'); 
    case 4: 
     return('5'); 
    case 5: 
     return('6'); 
    case 6: 
     return('7'); 
    case 7; 
     return('8'); 
    case 8: 
     return('9'); 
    case 9: 
     return('T'); 
    case 10: 
     return('J'); 
    case 11: 
     return('Q'); 
    case 12: 
     return('K'); 
} 
} 
int getBet() 
{ 
int bet; 
do 
{ 
    printf("How much do you want to bet?(Enter a number"); 
    printf("from 1 to 5, or 0 to quit the game): "); 
    scanf(" %d", &bet); 

    if (bet >= 1 && bet <= 5) 
    { 
     return(bet); 
    } 
    else if (bet == 0) 
    { 
     exit(1); 
    } 
    else 
    { 
     printf("\n\nPlease enter a bet from 1-5 or "); 
     printf("0 to quit the game\n\n"); 
    } 
}while ((bet < 0) || (bet > 5)); 
} 

int analyzeHand(int ranksinHand[], int suitsinHand[]) 
{ 
int num_consec = 0; 
int i, rank, suit; 
int straight = FALSE; 
int flush = FALSE; 
int four = FALSE; 
int three = FALSE; 
int pairs = 0; 


for (suit = 0; suit < 4; suit++) 
    if (suitsinHand[suit] == 5) 
     flush = TRUE; 
rank = 0; 
while (ranksinHand[rank] == 0) 
    rank++; 
for (; rank < 13 && ranksinHand[rank]; rank++) 
    num_consec++; 
if(num_consec == 5) { 
    straight = TRUE; 
} 
for (rank = 0; rank < 13; rank++){ 
    if (ranksinHand[rank] == 4) 
     four == TRUE; 
    if (ranksinHand[rank] == 3) 
     three == TRUE; 
    if (ranksinHand[rank] == 2) 
     pairs++; 
} 
if (straight && flush){ 
    printf("Straight Flush\n\n"); 
    return(20); 
} 
else if (four){ 
    printf("Four of a kind\n\n"); 
    return (10); 
} 
else if (three && pairs == 1){ 
    printf("Full House\n\n"); 
    return (8); 
} 
else if (flush){ 
    printf("Flush\n\n"); 
    return (5); 
} 
else if (straight){ 
    printf("Straight\n\n"); 
    return (4); 
} 
else if (three){ 
    printf("Three of a Kind\n\n"); 
    return (3); 
} 
else if (pairs == 2){ 
    printf("Two Pairs\n\n"); 
    return (2); 
} 
else if (pairs == 1){ 
    printf("Pair\n\n"); 
    return (1); 
} 
else{ 
    printf("High Card\n\n"); 
    return (0); 
} 
} 

void getFinalHand 
(int cardRank[], int cardSuit[], int finalRank[], int finalSuit[], int 
ranksinHand[], int suitsinHand[]) 
{ 
int i, j, carDup; 
char suit, rank, ans; 

for (i=0; i < 5; i++) 
{ 
    suit = getSuit(cardSuit[i]); 
    rank = getRank(cardRank[i]); 
    printf("Do you want to keep card #%d: %c%c", i+1, rank, suit); 
    printf("\nPlease answer (Y/N):"); 
    scanf(" %c", &ans); 
    if (toupper(ans) == 'Y') 
    { 
     finalRank[i] = cardRank[i]; 
     finalSuit[i] = cardSuit[i]; 
     ranksinHand[finalRank[i]]++; 
     suitsinHand[finalSuit[i]]++; 
     continue; 
    } 
    else if (toupper(ans) == 'N') 
    { 
     carDup = 0; 
     do{ 
      carDup = 0; 
      finalRank[i] = (rand() % 13); 
      finalSuit[i] = (rand() % 4); 

      for (j=0; j < 5; j++) 
      { 
       if((finalRank[i] == finalRank[j]) && (finalSuit[i] == 
     finalSuit[j])) 
       { 
        carDup = 1; 
       } 
      } 

      for (j=0; j < i; j++) 
      { 
       if((finalRank[i] == finalRank[j]) && (finalSuit[i] == 
    finalSuit[j])) 
       { 
        carDup = 1; 
       } 
      } 
     }while (carDup == 1); 
     ranksinHand[finalRank[i]]++; 
     suitsinHand[finalSuit[i]]++; 
    } 

} 
} 

Answer 1

int mainまたは void main は、仕事をするでしょう。 Here,int mainがC標準であることが示されている。 Return type of main()も参照してください。

Answer 2

慣例では、main()は整数を返す必要があります。

int main() 
{ 
    // Your method 

    return 0; 
}