what was the error

Question

#include <stdio.h>
int fact(int )
int main()
{
    int x;
    printf("enter the number x");
    scanf("%d",&x);
    int res=fact(x);
    printf("the factorial of %d is%d",x,res);
    return(0);
    

}
int fact(int n)
{
    if(n==1)
    return 1;
    else
    return n*f(n-1);
}

Answer 1

1. missing ';' in line "int fact(int )"

2. wrong name "f" in "return n*f(n-1);"

Answer 2

 return n*f(n-1); it will be written as return n*fact(n-1);

int fact(int n); ";" missing

Answer 3

int res is not declared first likt

int x,int res;