数组中的字符指针值

Question

I have the following code which gets some char tokens with strtok and it keeps these tokens one by one in a table and finally print these tokens. My error is in TABLE line:

error: invalid conversion from 'char* to 'char''

Something I misunderstood about the pointers and characters and I do not know how to write the TABLE line ((which I want to have the following format)). I tried something like

table[i][5+(i/2)] = *ptr;

but I had segmentation fault.

i = 0;
int offset = 5;
char* ptr;
ptr = strtok(buff,"do something");
char table[1][10];       
while (ptr != NULL)
 {
  if (i == 0)
     strcat(machine, ptr);
  if (i == 2)
     strcat(number, ptr);
  if (i == 4)
     strcat(hr, ptr); 
  if (i == 6)
     strcat(dw, ptr); 
  if (i == 8)
     strcat(vcc, ptr);
  ptr = strtok(NULL,"do something");
  table[i][5+(i/2)] = ptr;     
  i++;
 }
printf("Final: %s, %s, %s, %s, %s\n", machine, number, hr, dw, vcc);

Answer 1

table[i][5+(i/2)] = ptr; is wrong because you are trying to assign address instead of value.

table[i][5+(i/2)] = *ptr; is correct. It will give the value at the ptr .

Segmentation fault is because of i . it is referring an address which is out of array boundary.

Answer 2

You have missing some variables, and memory setup's. the variable machine should allocate enough memory, to store your strings in it. same for number , hr , dww , and vcc . Then, your table variable has coded, that only one (1) entry can exists in it - in other words: your table[1] is invalid, because it has not enough room, to "add" pointers to it. The array after table[1] - also the [10] ( table[1][10] ) indicates each table item (here, only one) that have it 10 bytes in length/size. So, you just write a "char" array, which can contain ten(10) characters. Which give a "static" literal/string.

As this, you can be lucky, if you don't get a system fault. But table seems be irrelevant, because your last code line, so far i can see this, only print number , hr , dww , and vcc on screen.

But this is not the mistake alone. Before all this code, you should get a crash at

char *ptr;
ptr = strtok(buff,"do something");

because you don't allocate memory for ptr, one line above.