作了一個程序來編輯行

Question

我已經設法制作一個程序，可以從一個文件中編輯一行表格。 但問題是，每當我輸入的最後一行的數字以編輯，它使我的程序崩潰...

這是文本文件，我用它來編輯....

      ***** INVENTORY ***** 
------------------------------------------------------------------------- 
S.N. |  NAME   |  CODE   | QUANTITY | PRICE 
------------------------------------------------------------------------- 
    1 25     45     54    54.00 
    2 fkfgyl    55dtylk2d    52    54.25 
    2 fkfgyl    55dtylk2d    52    54.25 
    2 fkfgyl    55dtylk2d    52    54.25 
    5 kjbx     zkjhvkz    45    45.00 
    2 fkfgyl    55dtylk2d    52    54.25 
    2 fkfgyl    55dtylk2d    52    54.25 
    2 fkfgyl    55dtylk2d    52    54.25 
    2 fkfgyl    55dtylk2d    52    54.25 
    2 kj     5j;     2    5.00 
    2 fkfgyl    55dtylk2d    52    54.25 

看！每當我輸入11（表示第15行），程序就會凍結！

這是代碼：

#include <stdio.h> 

FILE *fileptr1, *fileptr2; 

int adddata(i); 

int main(void) 
{ 
    char c; 

    int delete_line, temp = 1; 

    fileptr1 = fopen("inventory.txt", "r"); 

    c = getc(fileptr1); 

    //print the contents of file . 

    while (c != EOF) 

    { 

     printf("%c", c); 

     c = getc(fileptr1); 

    } 

    printf("\n\n\n Enter S.N. to be deleted and replaced "); 

    scanf("%d", &delete_line); 

    delete_line = delete_line+4; 

    //take fileptr1 to start point. 

    rewind(fileptr1); 

    //open replica.c in write mode 

    fileptr2 = fopen("replica.c", "w"); 


    c = getc(fileptr1); 

    while (c != EOF) 

    { 

     if (c == '\n') 

     { 

      temp++; 

     } 

     //till the line to be deleted comes,copy the content to other 

     if (temp != delete_line) 

     { 

      putc(c, fileptr2); 

     } 

     else 

     { 
      while ((c = getc(fileptr1)) != '\n') 

      { 

      } 

      fclose(fileptr2); 

      adddata(delete_line); 

      temp++; 

      fileptr2 = fopen("replica.c", "a"); 

      fflush(stdin); 

      putc('\n', fileptr2); 


     } 

     //continue this till EOF is encountered 

     c = getc(fileptr1); 

    } 

    fclose(fileptr1); 

    fclose(fileptr2); 

    remove("inventory.txt"); 

    rename("replica.c", "inventory.txt"); 

    fileptr1 = fopen("inventory.txt", "r"); 

    //reads the character from file 

    c = getc(fileptr1); 

    //until last character of file is encountered 

    while (c != EOF) 

    { 

     printf("%c", c); 

     //all characters are printed 

     c = getc(fileptr1); 

    } 

    fclose(fileptr1); 

    return 0; 

} 


int adddata(i) { 

    fileptr2 = fopen("replica.c", "a"); 

    struct details 
    { 
     char name[20]; 
     char code[20]; 
     float price; 
     long int quantity; 
    }; 

    struct details item[1]; 

    fflush(stdin); 

    printf("\nItem name: "); 
    scanf("%s", &item[0].name); 
    item[0].name[19] = '\0'; 
    fflush(stdin); 

    printf("\nItem code: "); 
    scanf("%s", &item[0].code); 
    item[0].code[19] = '\0'; 
    fflush(stdin); 

    printf("\nItem price: "); 
    scanf("%f", &item[0].price); 
    fflush(stdin); 

    printf("\nItem quantity: "); 
    scanf("%8ld", &item[0].quantity); 
    fflush(stdin); 
    fprintf(fileptr2, "\n %3d %-20s %-20s %-8ld %9.2f ", i-4, item[0].name, item[0].code, item[0].quantity, item[0].price); 

    fclose(fileptr2); 
    return 0; 
} 

Answer 1

問題解決了！最後一行沒有'\ n'，這就是爲什麼我必須使用& &和EOF 問題在這個段落。

//till the line to be deleted comes,copy the content to other 

    if (temp != delete_line) 

    { 

     putc(c, fileptr2); 

    } 

    else 

    { 

     while ((c = getc(fileptr1)) != '\n' && (c = getc(fileptr1)) != EOF) 
     { 

     } 
      fclose(fileptr2); 

      adddata(delete_line); 

      temp++; 

      fileptr2 = fopen("replica.c", "a"); 

      fflush(stdin); 

      putc('\n', fileptr2); 
    }