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Short one line solution for Tutorial '06' 'hw1' #16

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Short one line solution for Tutorial '06' 'hw1' #16

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13 changes: 10 additions & 3 deletions 18-Programming-4kids/06_homework_01_answer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -10,9 +10,16 @@ int main() {
bool is_even1 = (num % 2 == 0);

// is even using /2
double by2 = (double) num / 2.0;// this is either X.0 or X.5 (try 10, 11)
by2 = by2 - (int) by2;// Remove X. This is now either 0 (for even) or 0.5 (for odd)
bool is_even2 = by2 == 0;
// one line solution:
// **Hint** You don't need to cast 'num' to from 'int' to 'double' like "(double)num",
// by default if you divide it as an integer / 2.0 (which is double)
// C++ will convert num to 'double' and return 'double'
bool is_even_2 = (num / 2.0 - num / 2) == 0;

// multiple lines solution:
//double by2 = (double) num / 2.0;// this is either X.0 or X.5 (try 10, 11)
//by2 = by2 - (int) by2;// Remove X. This is now either 0 (for even) or 0.5 (for odd)
//bool is_even2 = by2 == 0;

// is even using %10
int last_digit = num % 10; // even last digit is 0, 2, 4, 6, 8
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