常量

常量基本特性如下图所示：

常量.png

测试代码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define HEIGHTBASE  150     // 宏

int main()
{
    char name[40];
    double weight;
    float height;
    int letters = 0;
    const int WEIGHTBASE = 48;
    const double CARDINAL = 0.6;

    printf("Hi!你叫什么名字（英文）？\n");
    scanf_s("%s", name, sizeof(name));
    printf("%s，你有多重（KG）？\n", name);
    scanf_s("%lf", &weight);
    printf("And， 你有多高（CM）？\n");
    scanf_s("%f", &height);

    letters = strlen(name);
    printf("太棒了！你的名字共计字母%u个！\n", letters);

    printf("你的体重为%G，标准体重为%2.2f！\n", weight, (height - HEIGHTBASE)*CARDINAL + WEIGHTBASE);

    system("pause");
    return 0;
}

输出结果如下所示：

1.png