c primer plus第4章 字符串和格式化输入/输出（一）

//==============================================================================
#include <stdio.h>
#include <string.h>
#define DENSITY 62.4

int main() {

    float weight, volume;
    int size, letters;
    char name[40];

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

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

    size = sizeof name;
    letters = strlen(name);//获取字符串的长度

    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 in.\n", size);

    return 0;
}

//字符串简介
#include <stdio.h>
#define PRAISE "what a super narvelous name!"

int main(void)
{
    char name[40];

    printf("What is your name?\n");
    scanf("%s", name);

    printf("Hello, %s, %s\n", name, PRAISE);

    return 0;
}

// \0空字符，不是数字0，是非打印字符，ASCII码的值为0
//scanf()开始读取以后会在遇到第一个空白字符空格，制表符，或者换行符处停止读取
//scanf()只会把一个单词而不是整个语句作为字符串读入

//"x",'x'的区别：1)'x'是基本类型char "x"是派生类型char数组，2)"x"是由两个字符'x','\0'组成