File input and appending to a string

I'm reading in a text file. I'm reading it one character at a time. How do I append the char I just read to the end of a string?

Here is what I've got (the appending part I can't figure out):

{
char field[40];
FILE *stream, *fopen();
stream = fopen("fisc.txt","r");
if ( (stream) == NULL)
{
printf("Can't open %sn","fisc.txt");
exit(1);
}
else
{
char ch;
int counter;
counter = 1;
do
{
ch = fgetc(stream);
//printf("In the else %c\n", ch);
if (ch != "|")
{
field[counter] = ch;
++counter;
printf("%s\n", field);
}
}
while (ch != EOF);

}
fclose(stream);
}

Any help or suggestions are greatly appreciated.

There are two ways I can see right off the top of my head. The first will place the character at the end of the array and the second places the character at the end of the current string in the array.

Code:

---

/*Method 1
**place at the end of the array
*/
array[SIZE - 1] = ch;

/*Method 2
**place at the end of the string
*/
int i = 0;
while(i < SIZE - 1){
    if(array[i] == '\0'){
        array[i++] = ch;
        array[i] = '\0'; break;
    }else
        i++;
}

---

-Prelude

use a pointer to your string.

Code:

---

while((ch = fgetc(stream) != EOF)
    *field_ptr++ = ch;

---

I would use an int for ch as EOF is an integer value.