#include<stdio.h>
int fatorial(int *n){
    if ((*n==1) || (*n==0)) return 1;
    else return fatorial(*n-1)*n;
}
int main(){
    int n = 5;
    printf("%dn",fatorial (&n));
}

else return fatorial(*n-1)*n;

[Warning] passing argument 1 of 'fatorial' makes pointer from integer without a cast
[Note] expected 'int *' but argument is of type 'int'
[Error] invalid operands to binary * (have 'int' and 'int *')