C Primer Plus 第4章字符串和格式化输入输出 4.1 前导程序

野性酷女 2024-03-27 16:22 49阅读 0赞

#### C Primer Plus ####

![在这里插入图片描述][7c659b131107482f86c49e5fad8d7da5.png_pic_center]

#### 第4章 字符串和格式化输入输出 ####

##### 4.1 前导程序 #####

talkback.c 程序

//
    // Created by DingJiaxiong on 2023-02-02 002.
    // 演示与用户交互
    #include <stdio.h>
    #include <string.h>
    
    #define DENSITY 62.4  // 人体密度
    
    int main() {
        
    
        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 first 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 first name has %d letters,\n", letters);
        printf("and we have %d bytes to store it.\n", size);
    
        return 0;
    }

运行结果

![在这里插入图片描述][fee24ca2811a4fb6951aace162d7c0bf.png_pic_center]

程序的新特性：

*  用数组储存字符串。
 *  使用%s 转换说明来处理字符串的输入输出。
 *  C预处理器定义字符常量
 *  C函数strlen() 获取字符串的长度。

[7c659b131107482f86c49e5fad8d7da5.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/27/0095e61570504dff99412c8bcdbdb893.png
[fee24ca2811a4fb6951aace162d7c0bf.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/27/8d26c77b8f8a4f6c9f7453d8b2bb9cbc.png