title: Triangular Numbers
signature: func triangularNumbers(num int) bool {
test_code: package main
  
  import (
      "fmt"
      "reflect"
      "math"
      "sort"
  )
  
  // SOLUTION CODE
  // ===================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE
  // ===================================
  func validateSolution(actual bool, expected bool) bool {
      return reflect.DeepEqual(actual,expected)
  }
  
  func driver(num int, expected bool) string {
      if validateSolution(PLACEHOLDER_FN_NAME(num),expected) {
              return "PASSED"
      }
      return "FAILED"
  
  }
  
  func main() {
  
      // Use imports to avoid undefined errors
      var _ = reflect.DeepEqual
      _ = math.Abs
      _ = sort.Sort
      result := ""
      result = driver(97, false)
      fmt.Printf("TEST-0...%s\n", result)
      
      result = driver(97, false)
      fmt.Printf("TEST-1...%s\n", result)
      
      result = driver(32, false)
      fmt.Printf("TEST-2...%s\n", result)
      
      result = driver(40, false)
      fmt.Printf("TEST-3...%s\n", result)
      
      result = driver(18, false)
      fmt.Printf("TEST-4...%s\n", result)
      
      result = driver(14, false)
      fmt.Printf("TEST-5...%s\n", result)
      
      result = driver(90, false)
      fmt.Printf("TEST-6...%s\n", result)
      
      result = driver(39, false)
      fmt.Printf("TEST-7...%s\n", result)
      
      result = driver(1, true)
      fmt.Printf("TEST-8...%s\n", result)
      
      result = driver(57, false)
      fmt.Printf("TEST-9...%s\n", result)
      
          
  }
source_py: def triangular_numbers(num):
      if (num < 0):
          return False
      (sum, n) = (0, 1)
      while (sum <= num):
          sum = (sum + n)
          if (sum == num):
              return True
          n += 1
      return False
source_cpp: bool triangular_numbers(int num) {
    if ( num < 0 ) return false;
    int sum = 0;
    for ( int n = 1;
    sum <= num;
    n ++ ) {
      sum = sum + n;
      if ( sum == num ) return true;
    }
    return false;
  }