#include <stdbool.h>

 1 #include<stdio.h>
 2 #include<stdbool.h>
 3 
 4 main()
 5 {
 6     _Bool bl, bl1;
 7     
 8     bl = true;
 9     bl1 = false;
10 
11     printf("b=%d\n", bl);
12 
13     printf("size=%d\n", sizeof(bl));
14 
15     printf("b=%d\n", bl1);
16 
17     printf("size=%d\n", sizeof(bl1));
18 }

 1 #include<stdio.h>
 2 #include<stdbool.h>
 3 
 4 main()
 5 {
 6     _Bool bl = 5 > 3;
 7 
 8     if (bl)
 9     {
10         printf("yes\n");
11     }
12     else
13     {
14         printf("no\n");
15     }
16 
17     getchar();
18 }