• C

if (variable) and if (!variable)

Hello all,

I am an (extreme) novice at C and any other kind of programming. I would like to know what do these two blocks of code do:

if (variable) {

   [some statements]

}

and

if (!variable) {

   [some statements]

}


I would also like to know what is the difference between them.

TIA
gfajdiAsked:
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scrapdogConnect With a Mentor Commented:
! is the boolean "not" operator


if (variable)  means:

"If the variable evaluates to 'true', then..."



if (!variable) means:

"If the variable evaluates to 'not true' (i.e. false), then..."


Nonzero values are considered 'true'.  Values that are 0 are considered 'false'.
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scrapdogCommented:
When you see the ! in C code, think of it as the word "not".
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gfajdiAuthor Commented:
0
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gfajdiAuthor Commented:
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gfajdiAuthor Commented:
So in other words:

if (variable)

is the same as

if (variable != 0)


and

if (!variable)

is the same as

if (variable == 0)


am I correct
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gfajdiAuthor Commented:
So in other words:

if (variable)


is the same as

if (variable != 0)


and

if (!variable)

is the same as

if (variable == 0)


Am I correct?
0
 
gfajdiAuthor Commented:
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gfajdiAuthor Commented:
Sorry for that I'm having some connection problems
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scrapdogCommented:
>if (variable)
>is the same as
>if (variable != 0)
>
>and
>
>if (!variable)
>is the same as
>if (variable == 0)
>
>Am I correct?

Yes, that is correct.
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gfajdiAuthor Commented:
Thanks, you have answered my question, here are your well-deserved points.
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