How to use bool data type in C

in reality, in C we don’t have a Boolean data type but some languages do have such as java, C++, and visual basic

Is it possible to use bool in C?

Yes! Absolutely

But we need to create our own Boolean type

So, here are the six ways by which we can create a bool in C

• Use  #include<stdbool.h> to use keyword bool
• Use _Bool an unsigned integer
• Create pre-processor macros
• Create global variables
• Define a bool type by using typedef
• Define a bool type by using an Enum

Use #include<stdbool.h> to use keyword bool

#include <stdio.h>
#include<stdbool.h>

int main()
{
 bool x,y;
int a=50,b=60,c=70;
x=a<b;//50<60 is true
y=b>=c;//60>=70 is false
printf("%d\n%d",x,y);// error if you didn’t include<stdbool.h>
printf("\nvalue=%d,value=%d",true,false);// error if you didn’t include<stdbool.h>
    return 0;
}

Output

1
0
value =1, value=0

Use _Bool an unsigned integer

The difference between using  #include<stdbool.h> and _Bool is that the _Bool unsigned integer  does not define constants true as 1 and false as 0

#include <stdio.h>
//#include<stdbool.h>

int main()
{
 _Bool x,y;
int a=50,b=60,c=70;
x=a<b;//50<60 is true
y=b>=c;//60>=70 is false
printf("%d\n%d",x,y);
//printf("\nvalue=%d,value=%d",true,false);// error if you didn’t include<stdbool.h>
    return 0;
}

Output

1
0

Create pre-processor macros

#include <stdio.h>
# define true 1 //pre-processor macros
# define false 0 //pre-processor macros

int main()
{
int a=50,b=60;
if ((a<b)==0)
printf("%d",true);
else
    printf("%d",false);
    return 0;
}

Output

0

Create global variables

#include <stdio.h>
const int true= 1; //global variable
const int false= 0; //global variable

int main()
{
int a=50,b=60;
if ((a<b)==0)
printf("%d",true);
else
    printf("%d",false);
    return 0;
}

Output

0

Define a bool type by using typedef

#include <stdio.h>
int main()
{
    typedef int boolean;
    boolean true=1;
    boolean false=0;
int a=50,b=60;
if ((a<b)==0)
printf("%d",true);
else
    printf("%d",false);
    return 0;
}

Output

0

Define a bool type by using an Enum

#include <stdio.h>
enum boolean{true=1,false=(!true)};
int main()
{
    enum boolean;
int a=50,b=60;
if ((a<b)==0)
printf("%d",true);
else
    printf("%d",false);
    return 0;
}

Output

0