What errors will occur when using true and false in C language
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
}
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