Basics of c# and string quesion-CodePudding

I am a new starter in programming. What do the quesion mark and the colon mean below?

string str= "PHP Tutorial";
Console.WriteLine((str.Substring(1, 2).Equals("HP") ? str.Remove(1, 2) : str));

CodePudding user response：

This is a shorthand for an if-Statement.

The same could also be written like this:

string str = "PHP Tutorial";
if(str.Substring(1, 2).Equals("HP")) {
    Console.WriteLine(str.Remove(1, 2));
} else {
    Console.WriteLine(str);
}

CodePudding user response：

a = b ? c : d;

is shorthand for:

if (b)
    a = c;
else
    a = d;

The C# ternary operator evaluates the first operand, which must be a Boolean expression, and returns the second operand if it's true and the third operand if it's false. The second and third operands must be of the same type so that the overall return type of the expression is known.

CodePudding user response：

C# includes a decision-making operator ?: which is called the conditional operator or ternary operator. It is the short form of the if else conditions.

condition ? statement 1 : statement 2

The following example demonstrates the ternary operator:

int x = 20, y = 10;

var result = x > y ? "x is greater than y" : "x is less than y";

Console.WriteLine(result);

output:

x is greater than y

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/conditional-operator