Question

所以我必须使用fscanf来扫描文本文件中的段落（单词），并编写了以下代码，它应该在理论上起作用，但它不是我真的很感激任何帮助。

代码段：

 char foo[81];
 char *final[MAXIUM]; //this is another way of making a 2d array right?
 int counter=0; 

 while (counter<MAXIUM && fscanf(file, "%s", foo)!= EOF){ 
   *final = (char*)malloc(strlen(foo)*sizeof(foo)); 
   //if (final ==NULL) 
   *(final + counter ) = foo + counter;

   counter++;
 }

文本文件看起来像任何旧段落：

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这段代码的要点是使用％s和fscanf扫描文本文件中的段落，然后为每个单词分配足够的空间并将其放入final中（foo对于扫描位来说是暂时的，它必须以这种方式完成）我们知道通过MAXIUM读取的最大单词。

感谢您的帮助：

Answer 1

更改

while (counter<MAXIUM && fscanf(foo, "%s", foo)!= EOF){
  *final = (char*)malloc(strlen(foo)*sizeof(foo)); 
  *(final + counter ) = foo + counter;
....
 for(counter=0; i<MAXIMUM; counter++) printf("%s",final[counter])

到

// Also recommend that the first thing you do is fill your `final[]` with NULL, 0
for (int j=0; j<MAXIUM; j++) final[j] = 0;

// changed fscanf to fgets.  Less issues with dropping whitespace.
while ((counter<MAXIUM) && (fgets(foo, sizeof(foo), stdin)!= EOF)){ 
  final[counter] = (char*)malloc(strlen(foo)+1);  // some say (char*) cast is undesirable, bit allowed.
  strcpy(final[counter], foo);
  // eliminate *(final + counter ) = foo + counter;  
...
for(i=0; i<counter; i++) printf("%s",final[i]);  // The fgets() will preserve the EOL

Answer 2

我认为您应该更改代码，以更正输出质量

 while (counter<MAXIUM && fscanf(foo, "%s", foo)!= EOF){ 

   /* the  strlen(foo) + 1 for store '\0' */
   final + counter = (char*)malloc((strlen(foo) + 1)*sizeof(foo)); 
   /* to copy the "foo" content  to final + n */
   strcpy(final + counter, foo, strlen(foo));
   /* each time should clear the foo array */
   memset(foo, 0, 81);

   counter++;
 }

Fscanf和Strings

2 个答案: