结构体、共用体和位运算

struct stu{
    char *name;  //姓名
    int num;  //学号
    char sex;  //性别
    float score;  //成绩
};

struct stu{
    char *name;  //姓名
    int num;  //学号
    char sex;  //性别
    float score;  //成绩
} stu1, stu2;

struct{  //没有写 stu
    char *name;  //姓名
    int num;  //学号
    char sex;  //性别
    float score;  //成绩
} stu1, stu2;

#define STU struct stu
STU{
    char *name;  //姓名
    int num;  //学号
    char sex;  //性别
    float score;  //成绩
};
STU stu1, stu2;

stu1.name;  //第一个学生的姓名
stu2.score;  //第二个学生的成绩

stu1.name = "Tom";
stu2.score = 90.5;

struct stu{
    char *name;  //姓名
    int num;  //学号
    char sex;  //性别
    float score;  //成绩
} stu1, stu2 = { "Tom", 10, ‘M‘, 90 };

#include <stdio.h>
#define STU struct stu
int main(){
    STU{
        char *name;  //姓名
        int num;  //学号
        char sex;  //性别
        float score;  //成绩
    };
    STU stu1;
    stu1.name = "James Bond";
    stu1.num = 1;
    stu1.sex = ‘M‘;  //用M表示男性，W表示女性
    stu1.score = 99;
    printf("Hello everyone! My name is %s, a naughty boy, but with good scores(%.2f) and top No.(%d)!", stu1.name, stu1.score, stu1.num);
    return 0;
}

struct stu{
    char *name;
    int num;
    char sex;
    float score;
}class[5];

struct stu{
    char *name;
    int num;
    char sex;
    float score;
}class[5] = {
    {"Li ping", 5, ‘M‘, 45},
    {"Zhang ping", 4, ‘M‘, 62.5},
    {"He fang", 1, ‘F‘, 92.5},
    {"Cheng ling", 2, ‘F‘, 87},
    {"Wang ming", 3, ‘M‘, 58}
};

#include <stdio.h>
struct stu{
    char *name;
    int num;
    char sex;
    float score;
}class[5] = {
    {"Li ping", 5, ‘M‘, 45},
    {"Zhang ping", 4, ‘M‘, 62.5},
    {"He fang", 1, ‘F‘, 92.5},
    {"Cheng ling", 2, ‘F‘, 87},
    {"Wang ming", 3, ‘M‘, 58}
};
int main(){
    int i, fail_num=0;
    float average, sum=0;
    for(i=0; i<5; i++){
        sum += class[i].score;
        if(class[i].score < 60) fail_num++;
    }
    printf("sum=%.2f\naverage=%.2f\nfail_num=%d\n", sum, sum/5, fail_num);
    return 0;
}

struct stu{
    char *name;
    int num;
    char sex;
    float score;
};

struct stu{
    char *name;
    int num;
    char sex;
    float score;
} *pstu, stu1, stu2;

#include <stdio.h>
struct stu{
    char *name;
    int num;
    char sex;
    float score;
} *pstu, stu1 = {"He fang", 1, ‘F‘, 92.5};
int main(){
    pstu = &stu1;
    printf("Number=%d, Name=%s\n",stu1.num, stu1.name);
    printf("Sex=%c, Score=%f\n\n",stu1.sex, stu1.score);
    printf("Number=%d, Name=%s\n",(*pstu).num, (*pstu).name);
    printf("Sex=%c, Score=%f\n\n",(*pstu).sex, (*pstu).score);
    printf("Number=%d, Name=%s\n",pstu->num, pstu->name);
    printf("Sex=%c, Score=%f\n",pstu->sex, pstu->score);
    return 0;
}

#include <stdio.h>
struct stu{
    int num;
    char *name;
    char sex;
    float score;
} *ps, boy[5]={
    {101, "Zhou ping", ‘M‘, 45},
    {102, "Zhang ping", ‘M‘, 62.5},
    {103, "Liou fang", ‘F‘, 92.5},
    {104, "Cheng ling", ‘F‘, 87},
    {105, "Wang ming", ‘M‘, 58}
};
int main(){
    printf("No\tName\t\tSex\tScore\t\n");
    for(ps=boy; ps<boy+5; ps++)
        printf("%d\t%s\t%c\t%f\t\n", ps->num, ps->name, ps->sex, ps->score);
    return 0;
}

#include <stdio.h>
#define STU struct stu
STU{
    int num;
    char *name;
    char sex;
    float score;
}boy[5]={
    {101,"Li ping",‘M‘,45},
    {102,"Zhang ping",‘M‘,62.5},
    {103,"He fang",‘F‘,92.5},
    {104,"Cheng ling",‘F‘,87},
    {105,"Wang ming",‘M‘,58}
};
void average(STU *ps);
int main(){
    STU *ps = boy;
    average(ps);
    return 0;
}
void average(struct stu *ps){
    int flunk=0, i;
    float sum=0;
    for(i=0; i<5; i++,ps++){
        sum += ps->score;
        if(ps->score < 60) flunk += 1;
    }
    printf("sum=%.2f, average=%.2f, flunk=%d\n", sum, sum/5, flunk);
}

#include <stdio.h>
int main(){
    enum week{
        sun, mon, tue, wed, thu, fri, sat
    } a, b, c;
    a = sun;
    b = mon;
    c = tue;
    printf("%d, %d, %d\n",a,b,c);
    return 0;
}

//先定义共用体，再定义变量
union data{
    int i;
    char ch;
};
data a, b, c;

//定义共用体的同时定义变量
union data{
    int i;
    char ch;
} a, b, c;

#include <stdio.h>
union{
    int i;
    char c;
}a;
int main(){
    printf("Size of a: %d\n", sizeof(a));
    a.c=‘A‘;  //此时共用体变量4个字节的取值情况为0x00000041
    printf("a.i = %d\n",a.i);
    a.i=0x42;  //0x42为字母B的ASCII码
    printf("a.c = %c\n",a.c);
    return 0;
}

typedef int INTEGER;
INTEGER a, b;
a = 1;
b = 2;

typedef struct stu{
    char name[20];
    int age;
    char sex;
} STU;

#include <stdio.h>
int main(){
    unsigned a=9;  //二进制数 00001001
    unsigned b=5;  //二进制数 00000101
    unsigned c=0XDE09A32B;  //十进制数 3725173547
    unsigned d=0X0000FFFF;  //十进制数 65535
    printf("a=%u, b=%u, a&b=%u\n", a, b, a&b);
    printf("c=%u, d=%u, c&d(%%d)=%u, c&d(%%X)=%X\n", c, d, c&d, c&d);
    return 0;
}

#include <stdio.h>
int main(){
unsigned a=9;  //二进制数 00001001
unsigned b=5;  //二进制数 00000101
unsigned c=0XDE09A30B;  //十进制数 3725173547
unsigned d=0XFFFF0000;  //十进制数 65535
    printf("a=%u, b=%u, a|b=%u\n", a, b, a|b);
    printf("c=%u, d=%u, c|d(%%d)=%u, c|d(%%X)=%X\n", c, d, c|d, c|d);
    return 0;
}

#include <stdio.h>
int main(){
    unsigned a=9;  //二进制数 00001001
    unsigned b=5;  //二进制数 00000101
    unsigned c=0X00FFFF00;  //十进制数 3725173547
    unsigned d=0XFFFF0000;  //十进制数 65535
    printf("a=%u, b=%u, a^b=%u\n", a, b, a^b);
    printf("c=%u, d=%u, c^d(%%d)=%u, c^d(%%X)=%X\n", c, d, c^d, c^d);
    return 0;
}

#include <stdio.h>
int main(){
    unsigned c=0X00FFFF00;  //十进制数 3725173547
    unsigned d=0XFFFF0000;  //十进制数 65535
    printf("c=%X, d=%X, c^d(%%X)=%X, c|d(%%X)=%X, c>>4=%X, c<<8=%X\n", c, d, c^d, c|d, c>>4, c<<8);
    return 0;
}

struct bs{
    int a:8;
    int b:2;
    int c:6;
};

struct bs{
    int a:8;
    int b:2;
    int c:6;
} data;

struct bs{
    unsigned a:4;
    unsigned :0;  //空域
    unsigned b:4;  //从下一单元开始存放
    unsigned c:4
}

struct k{
    int a:1;
    int  :2;  //该2位不能使用
    int b:3;
    int c:2;
};

#include <stdio.h>
int main(){
    struct{
        unsigned a:1;
        unsigned b:3;
        unsigned c:4;
    } bit, *pbit;
    bit.a=1;
    bit.b=7;
    bit.c=15;
    printf("%d, %d, %d\n", bit.a, bit.b, bit.c);
    pbit=&bit;
    pbit->a=0;
    pbit->b&=3;
    pbit->c|=1;
    printf("%d, %d, %d\n", pbit->a, pbit->b, pbit->c);
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
int main(){
    char plaintext = ‘a‘;  // 明文
    char secretkey = ‘!‘;  // 密钥
    char ciphertext = plaintext ^ secretkey;  // 密文
    char decodetext = ciphertext ^ secretkey;  // 解密后的字符
    char buffer[9];
    printf("            char    ASCII\n");
    // itoa()用来将数字转换为字符串，可以设定转换时的进制（基数）
    // 这里将字符对应的ascii码转换为二进制
    printf(" plaintext   %c     %7s\n", plaintext, itoa(plaintext, buffer, 2));
    printf(" secretkey   %c     %7s\n", secretkey, itoa(secretkey, buffer, 2));
    printf("ciphertext   %c     %7s\n", ciphertext, itoa(ciphertext, buffer, 2));
    printf("decodetext   %c     %7s\n", decodetext, itoa(decodetext, buffer, 2));
    return 0;
}

#include <stdio.h>
#include <conio.h>
#include <windows.h>
int main(){
    int width = 30, height = width;  //宽度和高度
    int x, y;  //x、y分别表示当前行和列
    HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
  
    //设置窗口大小
    system("mode con: cols=64 lines=32");
    //打印背景，按行输出
    for(x=0; x<width; x++){
        for(y=0; y<height; y++){
            if(y==0 || y==width-1 || x==0 || x==height-1){  //输出边框
                SetConsoleTextAttribute(hConsole, 4 );
                printf("□");
            }else{  //贪吃蛇活动区域
                SetConsoleTextAttribute(hConsole, 2 );
                printf("■");
            }
        }
        printf("\n");
    }
    //暂停
    getch();
    return 0;
}

struct POS{
    int x;  //所在行
    int y;  //所在列
}

struct{
    char type;
    int index;
}globalMap[MAXWIDTH][MAXHEIGHT];

struct{
    int x;
    int y;
} snakeMap[ (MAXWIDTH-2)*(MAXHEIGHT-2) ];