C：定义数据类型boolean

定义数据类型boolean

 　　

/*
*    os = Linux openeuler 4.19.90-2106.3.0.0095.oe1.x86_64
*    gcc_version = gcc version 7.3.0 (GCC) 
*    file_name = asserth.c
*    gcc   -o  asserth   asserth.c
*
*/  

#include <stdio.h>
#include <assert.h>


// 定义boolean数据类型
typedef enum _bool
{
        zero=0, one=1
} boolean;


// 定义boolean变量："true"和"false"
boolean true = one;
boolean false = zero;


void print_number(int* myint)
{
        assert(myint != NULL);
        printf("myint = %d\n", *myint);
}


// 检查输入数据的关系
boolean check_expr(int in1, int in2)
{
        assert(in1 >= in2);
        return true;
}


void msg(int f1, int f2)
{       check_expr(f1, f2);
        printf("%d >= %d .\n", f1, f2);
}


// test function
int main(int argc, char** argv)
{
        int f1 = 30, f2 = 15;
        msg(f1, f2);

        int fn = 10;
        int* b = NULL;
        int* c = NULL;

        b = &fn;

        print_number(b);
        print_number(c);

        return 0;
}