C#: how can this assume things?

Question

1.00/5 (3 votes)

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C#

using System;
static class boolclass
{
	public static void Main() 
	{
	int a = 1;
int b = 2;
// Which one is greater?
bool greaterAB = (a > b);
// Is 'a' equal to 1?
bool equalA1 = (a == 1);
// Print the results on the console
if (greaterAB )
{
Console.WriteLine("A > B");
}
else
{
Console.WriteLine("A <= B");
}
Console.WriteLine("greaterAB = " + greaterAB);
Console.WriteLine("equalA1 = " + equalA1);
// Console output:
// A <= B
// greaterAB = False
// equalA1 = True
Console.ReadKey(true);
	}
}

This point---

C#

if (greaterAB )

Does it assume that

C#

if (greaterAB)

is

C#

if (greaterAB == True)

More or less boolean default value is false so even if it assumes this, it should assume--

if (greaterAB == False)

What I have tried:

Googled it but I did not find anything which I could understand or is related to this.

Posted 24-Mar-16 8:43am

Member 12414152

Updated 24-Mar-16 8:59am

v2

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Comments

CHill60 24-Mar-16 14:56pm

The bit between the brackets is an expression that evaluates to either true or false. Default value has nothing to do with it. Nor is it making any assumptions. If the expression is true the statement following will be executed

Member 12414152 24-Mar-16 15:00pm

Why??
We haven't specified hat it should only be executed when the expression is true.

Sascha Lefèvre 24-Mar-16 15:03pm

That's the definition of the if-statement.

Member 12414152 24-Mar-16 15:17pm

Ohhhh, thanks, I completely lost my mind.

Sascha Lefèvre 24-Mar-16 15:22pm

You're welcome! ;-)

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Sascha Lefèvre · Accepted Answer · 2016-03-24T08:59:00

C#

if (greaterAB)

and

C#

if (greaterAB == true)

are equivalent and the first version should be preferred.

In C# you can't use an un-initialized identifier and in fact you initialize greaterAB:

C#

bool greaterAB = (a > b);

So at this point it reflects the fact whether a is greater than b and a boolean's default value of false has nothing to do with all this. Now if you had declared greaterAB as a class variable (which wouldn't make much sense) then it would be initialized to the default value of false the first time the static class is being used or, if it's a non-static class, an object of that class is instantiated.