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22 changes: 10 additions & 12 deletions 18-Programming-4kids/06_homework_01_answer.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -3,20 +3,18 @@ using namespace std;

int main() {

int num;
cin >> num;
cout<<"-If it shows 1, it's odd.\n \n";

// Is even using %2
bool is_even1 = (num % 2 == 0);
int num1;
cin>>num1;

cout<<(num1%2==1)<<"\n";

cout<<(num1%10==1||num1%10==3||num1%10==5||num1%10==7||num1%10==9)<<"\n";

double num1_double=num1;
cout<<(num1_double/2==num1/2+.5)<<"\n";

// 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;

// is even using %10
int last_digit = num % 10; // even last digit is 0, 2, 4, 6, 8
bool is_even3 = last_digit == 0 || last_digit == 2 || last_digit == 4 || last_digit == 6 || last_digit == 8;

return 0;
}
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