# Condition

## if / else

```C#
Console.WriteLint("Please enter your age: ");
int age = Convert.ToInt32(Console.ReadLine());

if (age > 100){
    Console.WriteLine("You are to old to signed up! ");
}
else if(age >= 18){
    Console.WriteLine("You are now signed up! ");
}
else if (age < 0){
    Console.WriteLine("You are not born yet! ");
}
else{
    Console.WriteLine("You must be 18+ to sing up! ");
}
```

```C#
Console.WriteLint("Please enter your name : ")
String name = Console.ReadLine()

if (name != ""){
    Console.WriteLine("hello : " + name);
}else{
    Console.WriteLine("You did not enter your name !" );
}

```

## switch

```C#
Console.WriteLint("What day is it today ?");
String day = Console.ReadLine();

switch(day)
{
    case "Monday":
        Console.WriteLine("It's Moday!")
        break;
    case "Tuesday":
        Console.WriteLine("It's Tuesday!")
        break;
    case "Wednesday":
        Console.WriteLine("It's Wednesday!")
        break;
    case "Thursday":
        Console.WriteLine("It's Thursday!")
        break;
    case "Friday":
        Console.WriteLine("It's Friday!")
        break;
    case "Saturday":
        Console.WriteLine("It's Friday!")
        break;
    case "Sunday":
        Console.WriteLine("It's Friday!")
        break;
    default:
        Console.WriteLine(day + "is not a day")
        break;
}

```

## Logical Operator

can be used to check if more than 1 condition is true / false
&& (AND)
|| (OR)

```C#
Console.WriteLine("What's the temperature outside");
double temp = Convert.ToDouble(Console.ReadLine());

if(temp >= 10 && temp <= 25){
    Console.WriteLine("It's warm outside");
}else if(temp <= -50 || temp >= 50){
    Console.WriteLine("DO NOT GO OUTSIDE !");
}
```