// talkback.c -- 演示与用户交互
#include <stdio.h>
#include <string.h> // 提供strlen()函数的原型
#define DENSITY 62.4 // 人体密度（单位：磅/立方英尺）
int main()
{
	float weight, volume;
	int size, letters;
	char name[40] = {0}; /* 声明字符串name, name是一个可容纳40个字符的数组 */
	printf("Hi! What's your first name?\n");
	scanf_s("%s", name);
	printf("%s, what's your weight in pounds?\n", name);
	scanf_s("%f", &weight);
	size = sizeof name;
	letters = strlen(name); /* strlen()函数的使用 */
	volume = weight / DENSITY;
	printf("Well, %s, your volume is %2.2f cubic feet.\n", name, volume);
	printf("Also, your first name has %d letters,\n", letters);
	printf("and we have %d bytes to store it.\n", size);
	return 0;
}