N seek with recursion!

#include "stdio.h"
long recursion(int n);
void main()
{
    int n;
    long result;
    printf("input a integer number:");
    scanf("%d",&n);
    result=recursion(n);
    printf("%d!=%ld\n",n,result);

}
long recursion(int n)
{
    long temp_result;
    if(n<0)
    {
        the printf ( " Input Error n should be greater than 0! " ); 

    } 
    the else  IF (n == 0 || == n . 1 ) 
    { 
        temp_result = . 1 ; 
    } 
    the else 
    { 
        temp_result = recursion (N- . 1 ) * n; 
    } 
    return temp_result ; 
}