Thread: read line

I am trying to read characters and count its numbers. First, my compiler prompted me for the size of the array. I added number 50, why do I have to specify size in this case?
I have an erro message:
parse error before "char"
The line in red is the spot where the error is.

Code:

#include <stdio.h>
#include <stdlib.h>
int readline(char str[], int n);
int main()
{
  char str[50];
  int n;
  
  printf("Enter your name please:\n");
  scanf("%d", str);
  printf("Your name has %d characters", read_line(char str[], int n));  
  int read_line(char str[], int n)
  {
    char ch;
    int i = 0;
    
    while ((ch=getchar()) != '\n')
         if(i < n)
           str[i++]=ch;
           
    str[i]='\0';
    return i;
    }
  
  system("PAUSE");	
  return 0;
}