C9_作业

1.(* *)写一个函数交换两个结构体变量

***MyFuncation.h***typedef struct exChange {    char name[20];    int num;}exChange;void exchange (exChange *p1, exChange *p2);

***MyFuncation.m***void exchange (exChange *p1, exChange *p2) {    // 注意传址,不能传值!    exChange temp = *p1;    *p1 = *p2;    *p2 = temp;}

***main.m***    exChange per1 = {"zhangsan", 15};    exChange per2 = {"lsii", 12};    exChange *p1 = &per1;    exChange *p2 = &per2;    exchange(p1, p2);    printf("%s ,%d\n", p1->name, p1->num);    printf("%s ,%d\n", p2->name, p2->num);

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2.

***MyFuncation.h***typedef struct student {    char name[20];    int num;    float score;} student;void printStu (student *p); // 打印信息函数

***MyFuncation.m***void printStu (student *p) {    printf("学生姓名: %s 学生学号: %d 学生成绩: %g\n", p->name, p->num, p->score );}

***main.n***    student stu1 = {"zhangsan", 1, 70};    student stu2 = {"lisi", 2, 80};    student stu3 = {"wangermazi", 3, 77};    student stu4 = {"zhaosi", 5, 66};    student stu5 = {"wangwu", 4, 90};    student stu[5] = {stu1, stu2, stu3, stu4, stu5};    student *p = stu;

(1).(* *)有一学生数组写一函数打印出指定分数段的学生信息

***MyFuncation.h***void Score(student *p, int count, int floor, int upper);

***MyFuncation.m***void Score(student *p, int count, int floor, int upper) {    for (int i = 0; i < count; i++) {        if ((p + i)->score >= floor && (p + i)->score <= upper) {            printStu(p + i);        }    }}

***main.m***Score(p, 5, 75, 80);

(2).(* *)有一学生数组,包含5个学生,写一个函数,对学生排序(按学号 从小到大),使用结构体指针操作数组元素.

***MyFuncation.hvoid numSort(student *p, int count);

***MyFuncation.m***void numSort(student *p, int count) {    for (int i = 0; i < count - 1; i++) {        for (int j = 0; j < count - 1 - i; j++) {            if ((p + j)->num > (p + j + 1)->num) {                student temp = *(p + j);                *(p + j) = *(p + j + 1);                *(p + j + 1) = temp;            }        }    }}

***main.m***    numSort(p, 5);    for (int i = 0; i < 5; i++) {        printStu(p + i);    }

(3).(* *)有一学生数组,包含5个学生,写一个函数,对学生排序(按姓名 从小到大),使用结构体指针操作数组元素

***MyFuncation.h***void nameSort(student *p, int count);

***Myfuncation.m***void nameSort(student *p, int count) {    for (int i = 0; i < count - 1; i++) {        for (int j = 0; j < count - 1 - i; j++) {            if (strcmp((p + j)->name, (p + j + 1)->name) > 0) {                student temp = *(p + j);                *(p + j) = *(p + j + 1);                *(p + j + 1) = temp;            }        }    }}

***main.m***    nameSort(p, 5);    for (int i = 0; i < 5; i++) {        printStu(p + i);    }

(4).(* *)有一学生数组,包含5个学生,写一个函数,对学生排序(按分数 从小到大),使用结构体指针操作数组元素.

***MyFuncation.h***void scoreSort(student *p, int count);

***MyFuncation.m***void scoreSort(student *p, int count) {    for (int i = 0; i < count; i++) {        for (int j =0; j < count - 1 - j; j++) {            if ((p + j)->score > (p + j + 1)->score) {                student temp = *(p + j);                *(p + j) = *(p + j + 1);                *(p + j + 1) = temp;            }        }    }}

***mian.m*** scoreSort(p, 6);    for (int i = 0; i < 5; i++) {        printStu(p + i);    }