/* talkback.c - 演示与用户交互 */
#include <stdio.h>
#include <string.h> // rkwastrlen()函数的原型

#define DENSITY 62.4    // 人体密码（单位：磅/立方英尺）

int main(void)
{
    float weight, volume;
    int size, letters;
    char name[40];  // name是一个可容纳40个字符的数组

    printf("Hi! What's your name?\n");
    scanf("%s", name);

    printf("%s, what's your weight in pounds?\n", name);
    scanf("%f", &weight);

    size = sizeof(name);
    letters = strlen(name);
    volume = weight / DENSITY;
    printf("Well, %s, your volume is %2.2f cubic feet.\n", name, volume);
    printf("Also, your name has %d letters,\n", letters);
    printf("and we have %d bytes to store if.\n", size);

    return 0;
}