C程序合併文件未找到EOF，陷入無限循環！

Question

我遇到了一些問題，試圖運行這個程序，我正在努力......要求說我不被允許使用排序功能...我自己做了一些事情....等等。

好看多了，程序編譯，但執行掛起後......我猜它是停留在一個無限循環......但我似乎無法找到它... :(

這個程序讀取該會已經至少責令其最大的數據文件，將它們合併（有序）到第三個txt文件...

的兩個文件是DATA1.TXT和Data2.txt 包含：

數據1 .txt

2 
2 
2 
2 

Data2.txt

1 
3 
5 
7 
9 

combine.c

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


void sortData(FILE *fpData1, FILE *fpData2) 
{ 

int n, m; 
FILE *fpMerge; 


fpMerge = fopen("Merge.txt", "w+"); 


fscanf(fpData2, "%i", &n); 
fscanf(fpData1, "%i", &m); 
while(n != EOF || m != EOF) 
{ 

    if(n == EOF) 
    { 
    fscanf(fpData1, "%i", &m); 

    while(m != EOF) 
    { 

    fprintf(fpMerge, "%i\n", m); 
    fscanf(fpData1, "%i", &m); 
    } 
    } 
    if(m == EOF) 
    { 
    fscanf(fpData2, "%i", &n); 

    while(n != EOF) 
    { 

    fprintf(fpMerge, "%i\n", n); 
    fscanf(fpData2, "%i", &n); 
    } 

    } 

    if(n < m) 
    { 
    fprintf(fpMerge, "%i\n", n); 
    fscanf(fpData2, "%i", &n); 
    } 
    if(n > m) 
    { 
    fprintf(fpMerge, "%i\n", m); 
    fscanf(fpData1, "%i", &m); 
    } 
    if(n == m) 
    { 
    fprintf(fpMerge, "%i\n", n); 
    fprintf(fpMerge, "%i\n", m); 
    fscanf(fpData2, "%i", &n); 
    fscanf(fpData1, "%i", &m); 

    } 
} 

fclose(fpMerge); 
} 

int main (void) 
{ 
FILE *fpData1; 
FILE *fpData2; 


fpData1 = fopen("Data1.txt", "r"); 
if(fpData1 == NULL) 
{ 
    printf("There was an error opening the file...program terminating..\n"); 
    exit(1); 
} 

fpData2 = fopen("Data2.txt", "r"); 
if(fpData2 == NULL) 
{ 
    printf("There was an error opening the file...program terminating..\n"); 
    exit(1); 
} 



sortData(fpData1, fpData2); 


fclose(fpData1); 
fclose(fpData2); 

return 0; 
} 

Answer 1

你不想比較n != EOF，而是fscanf返回值：

int count_1; 
count_1 = fscanf(fpData1, "%i", &m); 
if (count_1 == EOF) // EOF (or error) 
{ 
    // ... 
} 

fscanf也將錯誤返回EOF。如果需要分開告知EOF和錯誤條件，請使用ferror(fpData1)，然後查找錯誤代碼（存儲在errno中）。

Answer 2

你EOF的檢測是不太正確的

void sortData(FILE *fpData1, FILE *fpData2) 
{ 
    int data1; 
    int data2; 
    FILE *fpMerge; 

    fpMerge = fopen("Merge.txt", "w+"); 
    fscanf(fpData1, "%i", &data1); 
    fscanf(fpData2, "%i", &data2); 

    // While one file still has data   
    while(!feof(fpData1) && !feof(fpData2)) 
    { 
     // Choose 1 file to test 
     // Read from that file and put into merge file until either we 
     // run out of data or the condition fails. 
     if(data1 < data2) 
     { 
      do {fprintf(fpMerge, "%i\n", data1);} 
      while ((fscanf(fpData1, "%i", &data1) != 0) && (data1 <= data2)); 
     } 
     else 
     { 
      do {fprintf(fpMerge, "%i\n", data2);} 
      while ((fscanf(fpData2, "%i", &data2) != 0) && (data2 <= data1)); 
     } 
     // NOTE: if fscanf() returns 0 it has failed to read (EOF) 
    } 
    // One of the files has reached the EOF 
    // Dump the other file. 
    while(fscanf(fpData1, "%i", &data1) != 0) {fprintf(fpMerge, "%i\n", data1);} 
    while(fscanf(fpData2, "%i", &data2) != 0) {fprintf(fpMerge, "%i\n", data2);} 
} 

Answer 3

EOF不是字符。
EOF不是整數。
沒有文件將會有EOF（既不char也不int）在他們。

EOF是一種病症。
文件將處於該狀態或（通常）不是。

您應該檢查返回值fscanf()以檢測EOF或其他問題。