c - Syntax error in method signature in .h file -

i'm trying write c concordance program reads words in file, strips them of non-alphanumeric characters, counts number of times occur, , prints them out, sorted , formatted, file containing word , it's corresponding count in text.

i'm running compiler error , cannot figure out issue is, since has no problem node *top in previous method signature...

the error i'm getting is:

proj1f.h:12: error: syntax error before "file"

.h file:

#ifndef proj1f_h #define proj1f_h  typedef struct node {   char *data;   struct node *left;   struct node *right; } node;  void insert(char *x, node *top, int count);  void print(node *top, file *file, int *count, int index);  #endif 

functions .c file

#include "proj1f.h" #include <stdio.h> #include <stdlib.h> #include <ctype.h> #include <string.h>  void insert(char *x, node *top, int count){     if(top == null){    //place insert     node *p = malloc(sizeof(node));         p -> data = x;         p -> left = p-> right = null;         top = p;     count++;     }     else if(x == top -> data)         count++;     else if(x < top -> data)         insert(x, top -> left, count);     else //x > top -> data;         insert(x, top ->  right, count); }  void print(node *top, file *file, int *count, int index){     if(top == null)         fprintf(file, "%s", "no input read in file");     else{         print(top -> left, file, count, index++);         fprintf(file, "%-17s %d\n", top -> data, count[index]);       print(top -> right, file, count, index++);     } } 

main .c file

#include "proj1f.h" #include <stdio.h> #include <stdlib.h> #include <ctype.h> #include <string.h>   int main(int argc, char *argv[]) { int count[300]; int index = 0; int wordinfile = 0; node *root = null;  file * readfile = fopen(argv[1], "r");  while(feof(readfile)) {   char word[30];   char fword[30];   fscanf(readfile, "%s", word);    //format word   int findex = 0;   int i;   for(i = 0; < strlen(word); i++) {     if(isalnum(word[i])) {       fword[findex] = word[i];       findex++;     } else if(word[i] == null) {       fword[findex] = word[i];       break;     }   }    //insert tree   insert(fword, root, count[wordinfile]);   wordinfile++; }  fclose(readfile); file *writefile = fopen(argv[2], "w+"); print(root, writefile, count, index); fclose(writefile);  return 0; } 

any appreciated.

you're including project header before <stdio.h>, file type isn't defined yet.

you need either include <stdio.h> project header, or include project header after <stdio.h>.