C中的劇院程序問題

Question

我正在爲我的班級創建一個程序。我必須展示每排有30個座位的15排劇院的佈局。該程序應該要求用戶輸入每行的價格，我已經完成並且似乎沒有問題。然後，用戶需要輸入正在出售的座位的行和列，然後顯示座位所佔據的座位。空座位以＃代表，被佔席位以*代表。出於某種原因，我無法讓程序正確顯示劇院佈局。它不使用英鎊符號表示空座位，並且在座位出售時不顯示佈局的差異。這裏是我的代碼：

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

void mapSeats(int i, int j, char sts[][30]){ 
     char TAKEN='*'; 
     char EMPTY='#'; 
     int rw=15; 
     int col=30; 
     printf("     Seats\n"); 
     fflush(stdout); 
     printf("  123456789"); 
     fflush(stdout); 
     for(i=0; i<rw; i=i+1){ 
      printf("\nRow %d ", i); 
      fflush(stdout); 
      for(j=0; j<col; j=j+1){ 
       printf("%c", sts); 
      } 
     } 
    } 

void theatre(void){ 
    int row=15; 
    int column=30; 
    float prices[15]; 
    char sts[row][column]; 
    char TAKEN='*'; 
    char EMPTY='#'; 
    int reserve; 
    int i=0; 
    int j=0; 
    //float cost; 
    //int static total; 

    printf("Enter the price for each row of seats.\n"); 
    fflush(stdout); 
    for(row=0; row<15; row=row+1){ 
     printf("Row %d:\n", row); 
     fflush(stdout); 
     scanf("%f", &prices[row]); 
    } 

    /*printf("What would you like to do? Select a number:\n"); 
    printf("1: Reserve seats"); 
    printf("2: View total ticket sales"); 
    printf("3: View sold and available seats");*/ 

    for(i=0; i<row; i=i+1){ 
     for(j=0; j<column; j=j+1){ 
      sts[i][j]=EMPTY; 
     } 
    } 

    mapSeats(i, j, sts); 


    printf("\nHow many seats would you like to reserve?\n"); 
    fflush(stdout); 
    scanf("%d", &reserve); 

    printf("Enter the row and column number for the desired seat(s).\n"); 
    fflush(stdout); 
    for(int k=1; k<=reserve; k=k+1){ 
     scanf("%d %d", &row, &column); 
     printf("\nYou have selected Row %d, Column %d\n", row, column); 
     fflush(stdout); 
     for(i=0; i<15; i=i+1){ 
      for(j=0; j<=30; j=j+1){ 
       if(row==i && column==j){ 
        sts[i][j]=TAKEN; 
       } 
      } 
     } 
    } 
    mapSeats(i, j, sts); 





} 

int main(void) { 
    theatre(); 
    return 0; 
} 

只要你知道，我的教授指示類中的每個printf()語句後寫fflush(stdout)，因爲他說有在Eclipse（我的編譯器），使得它需要一個錯誤。

Answer 1

如果你正在尋找1件你能做的事情，那真的會幫助你解決你的代碼問題，在編譯時啓用警告。至少-Wall -Wextra。 （您可以添加-pedantic以獲取更多警告）。

這些警告告訴你在哪裏尋找解決你的代碼問題。例如：

$ gcc -Wall -Wextra -Ofast -o bin/theater theater.c 

theater.c: In function ‘mapSeats’: 
theater.c:18:13: warning: format ‘%c’ expects argument of type ‘int’, but argument 2 has type ‘char (*)[30]’ [-Wformat=] 
      printf ("%c", sts); 
      ^
theater.c:7:10: warning: unused variable ‘EMPTY’ [-Wunused-variable] 
    char EMPTY = '#'; 
     ^
theater.c:6:10: warning: unused variable ‘TAKEN’ [-Wunused-variable] 
    char TAKEN = '*'; 

僅修復這些問題將讓你的代碼，以顯示你正在尋找的地圖：

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

void mapSeats (int i, int j, char sts[][30]) 
{ 
//  char TAKEN = '*'; 
//  char EMPTY = '#'; 
    int rw = 15; 
    int col = 30; 
    printf ("     Seats\n"); 
    fflush (stdout); 
    printf ("  123456789"); 
    fflush (stdout); 
    for (i = 0; i < rw; i = i + 1) { 
     printf ("\nRow %2d ", i); 
     fflush (stdout); 
     for (j = 0; j < col; j = j + 1) { 
      printf ("%c", sts[i][j]); 
      fflush (stdout); 
     } 
    } 
    putchar ('\n'); 
} 

void theatre (void) 
{ 
    int row = 15; 
    int column = 30; 
    float prices[15]; 
    char sts[row][column]; 
    char TAKEN = '*'; 
    char EMPTY = '#'; 
    int reserve; 
    int i = 0; 
    int j = 0; 
    //float cost; 
    //int static total; 

    printf ("Enter the price for each row of seats.\n"); 
    fflush (stdout); 
    for (row = 0; row < 15; row = row + 1) { 
     printf ("Row %2d:\n", row); 
     fflush (stdout); 
     scanf ("%f", &prices[row]); 
    } 

    /*printf("What would you like to do? Select a number:\n"); 
    printf("1: Reserve seats"); 
    printf("2: View total ticket sales"); 
    printf("3: View sold and available seats"); */ 

    for (i = 0; i < row; i = i + 1) { 
     for (j = 0; j < column; j = j + 1) { 
      sts[i][j] = EMPTY; 
     } 
    } 

    mapSeats (i, j, sts); 

    printf ("\nHow many seats would you like to reserve?\n"); 
    fflush (stdout); 
    scanf ("%d", &reserve); 

    printf ("Enter the row and column number for the desired seat(s).\n"); 
    fflush (stdout); 
    for (int k = 1; k <= reserve; k = k + 1) { 
     scanf ("%d %d", &row, &column); 
     printf ("\nYou have selected Row %d, Column %d\n", row, column); 
     fflush (stdout); 
     for (i = 0; i < 15; i = i + 1) { 
      for (j = 0; j <= 30; j = j + 1) { 
       if (row == i && column == j) { 
        sts[i][j] = TAKEN; 
       } 
      } 
     } 
    } 
    mapSeats (i, j, sts); 
} 

int main (void) 
{ 
    theatre(); 
    return 0; 
} 

示例輸出

$ ./bin/theater <seatprice.txt 

<snip> 

How many seats would you like to reserve? 
Enter the row and column number for the desired seat(s). 

You have selected Row 1, Column 5 

You have selected Row 1, Column 6 

You have selected Row 2, Column 6 

You have selected Row 2, Column 7 
       Seats 
     123456789
Row 0 ############################## 
Row 1 #####**####################### 
Row 2 ######**###################### 
Row 3 ############################## 
Row 4 ############################## 
Row 5 ############################## 
Row 6 ############################## 
Row 7 ############################## 
Row 8 ############################## 
Row 9 ############################## 
Row 10 ############################## 
Row 11 ############################## 
Row 12 ############################## 
Row 13 ############################## 
Row 14 ############################## 

爲了完整起見，以下是使用的輸入文件：

$ cat seatprice.txt 
500 
450 
400 
350 
300 
250 
200 
150 
125 
120 
115 
110 
105 
100 
90 
4 
1 5 
1 6 
2 6 
2 7 

注：糾正其中的打印'*'列，調整您在這裏指數：

if (row == i && column == j+1) {