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This article will explain in detail what errors will occur when using true and false in C language. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

The C language standard (C89) does not define Boolean types. If you use true and false, the following errors will occur:

Truefalse error result

Infinite.c:5:12:error:useofundeclaredidentifier'true'

While (true) {

1errorgenerated.

Make:*** [infinite] Error1

We can use the macro definition of C language to set up:

/ / Macro defines Boolean type

# defineBOOLint

# defineTRUE1

# defineFALSE0

/ / define a Boolean variable

BOOLflag=FALSE

It can also be defined by enumerating classes:

Typedefenum

{

True=1,false=0

} bool

Truefalse instance

# include

/ / calculating the value of nautical _ n is defined in main

Intmain (void)

{

Intn=10;// calculates the stack multiplier

Intsum=1;// is used to store the results of multiplication.

Typedefenum

{

True=1,false=0

} bool

Boolflag=false;// superposition marker

Number of intnum=n;// cycles

While (! flag)

{

Sum=sum* (num--)

/ / end the loop when num=1

If (num==1)

{

Flag=true

}

}

Printf (the multiplicative value of "% d is% d\ n", n.)

Return0

}

This is the end of the article on "what mistakes will occur when using true and false in C language". I hope the above content can be helpful to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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