2.
( int, double string; ) .
.
2.1. , .
staticvoid Main()
{
Console.WriteLine(" : ");
intx = int.Parse(Console.ReadLine());
if ((x< 100) || (x> 999)) Console.WriteLine("
!");
else
{
inta = x / 100; //
intb = x / 10 % 10; //
intc = x % 10; //
int sum = a + b + c;
Console.WriteLine(" " + sum);
}
Console.ReadKey();
}
:
- , , , (||). , ;
- (&&) (!);
- if. , else, , ;
- , , ;
- / , % . .
2.2. , .
if, switch:
staticvoidMain()
{
Console.WriteLine(": ");
int n = int.Parse(Console.ReadLine());
string s;
switch (n)
{
case 1: s = ""; break;
case 2: s = ""; break;
case 3: s = ""; break;
case 4: s = ""; break;
case 5: s = ""; break;
case 6: s = ""; break;
case 7: s = ""; break;
default: s = ""; break;
}
if (s!= "") Console.WriteLine(" " + s);
elseConsole.WriteLine(" !");
Console.ReadKey();
}
case break switch . default , . case.
: s !=. ==.
|
|
2.1. , , , . , .
2.2. ( ). , , (34 4343).
2.3. . .
2.4. x y,
.
2.5. , (x, y), , x y.
2.6. , , .
2.7. (, ). , , . .
2.8. , .
2.9. , . , : 5 , 4 , 3 , 2, 1 0 ( switch).
2.10. , . ( , 11 , 12 15 , 16 25 , 26 70 , 70 99 , 100 ). : (, 20) . 20 ..
: .