使用文件指針創建二維數組

Question

我寫了這個程序，從輸入文件創建一個二維數組，然後對數字做各種事情，如計算平均值，獲取最大值等... 輸入文件有96個字符， 12行，每行8個字符。這正是我想要設置陣列的方式。

我覺得一切都是正確的，除了創建數組。當我運行函數來打印數組時，會彈出一些非常奇怪的數字，包括底片。遠離輸入文件中的內容。

任何人都可以在makeArray函數或我如何調用主函數中看到錯誤嗎？

#include <stdio.h>   
void makeArray(FILE*ptr, int array[12][8]) { 
    int i,j; 
    ptr = fopen("scores.txt", "r"); 
    for (i = 0 ; i < 12 ; i++) { 
     for (j = 0 ; j < 8 ; j++) { 
      fscanf(ptr, "%d", &array[i][j]); 
     } 
    } 
} 

int getScore(int array[12][8], int mon, int trn) {  
    return array[mon][trn]; 
} 

int getMonthMax(int array[12][8], int mon) { 
    int max = 0, i; 
    for (i = 0 ; i < 8 ; i++) { 
     if (array[mon][i]>max) 
      max = array[mon][i]; 
    } 
    return max; 
} 

int getYearMax(int array[12][8]) { 
    int max = 0, i, j; 
    for (i = 0 ; i < 12 ; i++) { 
     for (j = 0 ; j < 8 ; j++) { 
      if (array[i][j] > max) 
       max = array[i][j]; 
     } 
    } 
    return max; 
} 

int getMonthAvg(int array[12][8], int mon) { 
    int avg, sum = 0, i; 
    for (i = 0 ; i < 8 ; i++) { 
     sum = array[mon][i] + sum; 
    } 
    avg = sum/8; 
    return avg; 
} 

int getYearAvg(int array[12][8]) { 
    int avg, sum=0, i, j; 
    for (i = 0 ; i < 12 ; i++) { 
     for (j = 0 ; j < 8 ; j++) { 
      sum = array[i][j] + sum; 
     } 
    } 
    avg = sum/(12 * 8); 
    return avg; 
} 

int toursMissed(int array[12][8]) { 
    int count = 0, i, j; 
    for (i = 0 ; i < 12 ; i++) { 
     for (j = 0 ; j < 8 ; j++) { 
      if (array[i][j] == 0) 
       count++; 
     } 
    } 
    return count; 
} 


void printArray (int array[12][8]) { 
    int i, j; 
    printf("The scores for the year are:\n"); 
    for (i = 0 ; i < 12 ; i++) { 
     for (j = 0 ; j < 8 ; j++) { 
      printf("%d\t", array[i][j]); 
     } 
     printf("\n"); 
    } 
} 

void displayMenu() { 
    printf("What would you like to do?\n"); 
    printf("------------------------------------\n"); 
    printf("Select from options 1-7 or 0 to stop\n"); 
    printf("Select 1 to get the score for a specific game\n"); 
    printf("Select 2 to get the max score for a specific month\n"); 
    printf("Select 3 to get the average score for a specific month\n"); 
    printf("Select 4 to get the max score for the year\n"); 
    printf("Select 5 to get the average score for the year\n"); 
    printf("Select 6 to get the number of tournaments missed for the year\n"); 
    printf("Select 7 to print all scores for the year\n"); 
    printf("Select 0 to stop\n"); 
    printf("------------------------------------\n"); 
} 

void processRequest(int array[12][8], int num) { 
    int scores[12][8], answ, mon, game; 

    if (num == 0) { 
     printf("Thank you! Goodbye."); 
    }  
    else if (num == 1) { 
     printf("Please enter the month and the game\n"); 
     scanf("%d%d", &mon, &game); 
     answ= getScore(scores, mon, game); 
     printf("The score for Tournament %d is %d\n\n\n\n", game, answ); 
    } 
    else if (num == 2) { 
     printf("Please enter the month\n"); 
     scanf("%d", &mon); 
     answ=getMonthMax(scores, mon); 
     printf("The maximum score for month %d is %d\n\n\n\n", mon, answ); 
    } 
    else if (num == 3) { 
     printf("Please enter the month\n"); 
     scanf("%d", &mon); 
     answ=getMonthAvg(scores, mon); 
     printf("The average score for month %d is %d\n\n\n\n", mon, answ); 
    } 
    else if (num == 4) { 
     answ= getYearMax(scores); 
     printf("The max score for the year is %d\n\n\n\n", answ); 
    } 
    else if (num == 5) { 
     answ= getYearAvg(scores); 
     printf("The average score for the year is %d\n\n\n\n", answ); 
    }    
    else if (num == 6) { 
     answ= toursMissed(scores); 
     printf("The number of tournaments missed for the year is %d\n\n\n\n", answ); 
    }  
    else if (num == 7) { 
     printArray(scores); 
     printf("\n\n\n\n"); 
    } 
    else 
     printf("Please make a valid selection\n\n\n\n"); 
} 

int main() { 
    int choice; 
    int scores[12][8]; 

    FILE *input; 
    makeArray(input, scores); 

    do { 
     displayMenu(); 
     scanf("%d", &choice); 

     processRequest(scores, choice);  
    } while (choice != 0); 

    return 0; 
} 

Answer 1

首先。您應該爲陣列中的每個原始內存分配內存

int ii; 
typedef FILE * FILE_PTR; 
FILE_PTR ** lossArr = (FILE_PTR**)malloc(sizeof(FILE_PTR*) * i); 
for (ii = 0; ii < i; ii++) { 
    lossArr[ ii ] = (FILE_PTR*)malloc(sizeof(FILE_PTR) * j); 
} 
// now you can use lossArr[ x ][ y ], where x = 0..i-1, y = 0..j-1