개별적으로 하면 함수는 다컴파일되더라구요,, 근데 이렇게 합쳐서 하면.. file open error이나와
요, 왜그런건지.알려주세요


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

/*알파벳 확인 함수*/

int alp(char c)
{
  if ((c>='a' && c<='z') || (c>='A' && c <= 'z'))
      return(1);
  else
      return(0);
}
/*한줄읽기함수1*/

readline1(char buffer1[])
{
char ch;
int i=0;
FILE *aa;
aa = fopen("a.txt","r");
  if( aa == NULL )
  {
    printf("file open error \n");
    exit(1);
   }
 
   
do {
      ch=getc(aa);
       buffer1[i]=ch;
    ++i;
     }
while(ch != '\n');


     buffer1[i -1] = '\0';

}



/*단어의수 센다 함수*/

int count(char string[])

{
   int i,looking =1,wordc =0;

  for(i=0;string[i] !='\0'; ++i)
    if(alp(string[i])){
       if(looking){
       ++wordc;
       looking=0;
       }
    }else
       looking=1;

  return(wordc);
}
     

main()
{

    char text[81];
    int end=0, total =0;

  while ( ! end) {
    readline1(text);

    if (text[0] == '\0')
        end=1;
    else
      total+=count(text);

    }
    printf("%d",total);

  

}


a.txt: apple                              
       pineapple 
       strawberry
       tomato 
       orange 
       watermelon
       melon
       mango
       cherry
       grapes
b.txt :embryo
       plum
       banana
       lemon 
       strawberry
       orange 
       watermelon
       peach
       mango
       cherry
       grapes