title: C Program Factorial Number 2
signature: pub fn c_program_factorial_number_2(n: i32) -> i64 {
test_code: use std::collections::HashMap;
  use std::collections::HashSet;
  use std::cmp::*;
  use std::collections::*;
  use std::fmt::*; 
  
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  pub fn validate_solution(actual: i64, expected: i64)->bool{
  return actual==expected
  }
  pub fn driver(n: i32, expected: i64)->String{
      if validate_solution(PLACEHOLDER_FN_NAME(n), expected) {
        return "PASSED".to_string();
      };
      return "FAILED".to_string();
  
  }
  
  fn main() {
      println!("TEST-0...{}", driver(
        19, 
        121645100408832000
      ));
      
  }
source_py: def c_program_factorial_number_2(n):
      return (1 if ((n == 1) or (n == 0)) else (n * c_program_factorial_number_2((n - 1))))
source_cpp: int c_program_factorial_number_2(int n) {
    return ( n == 1 || n == 0 ) ? 1 : n * c_program_factorial_number_2 ( n - 1 );
  }