JuniorTheoryCommon

What does the program print (lines separated by spaces)?

double a = 0.1 + 0.2;
decimal b = 0.1m + 0.2m;
Console.WriteLine(a == 0.3);
Console.WriteLine(b == 0.3m);

False True

Expecting 0.1 + 0.2 == 0.3 to be true: double stores binary fractions, so the sum is 0.30000000000000004.
Expecting decimal to miss as well: it stores decimal digits, so 0.1m + 0.2m is exactly 0.3m.

JuniorTheoryCommon

double a = 0.1 + 0.2;
decimal b = 0.1m + 0.2m;
Console.WriteLine(a == 0.3);
Console.WriteLine(b == 0.3m);

False True

Expecting 0.1 + 0.2 == 0.3 to be true: double stores binary fractions, so the sum is 0.30000000000000004.
Expecting decimal to miss as well: it stores decimal digits, so 0.1m + 0.2m is exactly 0.3m.