Day10_c语言_高级指针练习

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主函数部分:

// main.m

// Day10_高级指针

// Created by 王佳兴 on 14-10-27.

#import <Foundation/Foundation.h>

#import "MYFunction.h"

第六题

#define RoundArea(A) ((A) * (A) * (3.14))

第七题

#define avg(A, B) (((A) + (B)) / 2)

int main(int argc,const char * argv[]) {

1. (**)写一个函数交换两个结构体变量

MYExchanges a = {3,5};

MYExchanges b = {4,6};

MYExchanges *p = &a;

exchanges(p, &b);

printf("%d", (&a)->width);

2. (**)有一学生数组写一函数打印出指定分数段的学生信息

MYStudent studentInfo[5] = {{"王佳兴",100}, {"蛋头",59}, {"伙夫",90}, {"杨亭",0}, {"快跑",69}};

printfInfo(studentInfo,0, 100, 5);

3. (**)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

MYStudent studentInfo[5] = {{"王佳兴",100}, {"蛋头",59}, {"伙夫",90}, {"老孟",0}, {"快跑",69}};

studentSort(studentInfo,5);

4. (**)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

MYStudent studentInfo[5] = {{"wangjiaxing",100}, {"dantou",59}, {"huofu",90}, {"laomeng",0}, {"kuaipao",69}};

studentNameSort(studentInfo,5);

5. (**)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

MYStudent studentInfo[5] = {{"王佳兴",100}, {"蛋头",59}, {"伙夫",90}, {"老孟",0}, {"快跑",69}};

studentSort(studentInfo,5);

6. (**)定义一个求圆面积的宏

printf("%.2f", RoundArea(2));

7. (**)定义一个求2个数平均数的宏

printf("%.1f", avg(5.0,8.0));

return 0;

}

声明部分:

// MYFunction.h

// Day10_高级指针

// Created by 王佳兴 on 14-10-27.

#import <Foundation/Foundation.h>

第一题

struct exchangeVariable{

int width;

int height;

};

typedef struct exchangeVariable MYExchanges;

void exchanges(MYExchanges *p1, MYExchanges *p2);

第二题

struct student{

char name[20];

int score;

};

typedef struct student MYStudent;

void printfInfo(MYStudent *p, int count1, int count2, int size);

第三题

struct student{

char name[20];

int score;

};

typedef struct student MYStudent;

void studentSort(MYStudent *p, int size);

第四题

struct student{

char name[20];

int score;

};

typedef struct student MYStudent;

void studentNameSort(MYStudent *p, int size);

第五题

struct student{

char name[20];

int score;

};

typedef struct student MYStudent;

void printfInfo(MYStudent *p, int count1, int count2, int size);

函数部分:

// MYFunction.m

// Day10_高级指针

// Created by 王佳兴 on 14-10-27.

#import "MYFunction.h"

第一题

void exchanges(MYExchanges *p1, MYExchanges *p2)

{

MYExchanges temp = *p1;

*p1 = *p2;

*p2 = temp;

}

第二题

void printfInfo(MYStudent *p,int count1, int count2,int size)

{

for (int i =0; i < size; i++) {

if ((p + i)->score >= count1 && (p + i)->score <= count2) {

printf("%s %d\n", (p + i)->name, (p + i)->score);

}

第三题

void studentSort(MYStudent *p,int size)

{

for (int i =0; i < size - 1; i++) {

for (int j =0; j < size - i - 1; j++) {

if (((p + j)->score) > ((p + j + 1)->score)) {

int temp1 = (p + j)->score;

(p + j)->score = (p + j +1)->score;

(p + j +1)->score = temp1;

char temp2[20];

strcpy(temp2, (p + j)->name);

strcpy((p + j)->name, (p + j +1)->name);

strcpy((p + j +1)->name, temp2);

}

for (int i =0 ; i < size; i++) {

printf("%s %d\n", (p + i)->name, (p + i)->score);

}

第四题

void studentNameSort(MYStudent *p,int size)

{

for (int i =0; i < size - 1; i++) {

for (int j =0; j < size - i - 1; j++) {

if (strcmp((p + j)->name, (p + j + 1)->name) > 0) {

char temp1[20];

strcpy(temp1, (p + j)->name);

strcpy((p + j)->name, (p + j +1)->name);

strcpy((p + j +1)->name, temp1);

int temp2 = (p + j)->score;

(p + j)->score = (p + j +1)->score;

(p + j +1)->score = temp2;

}

for (int i =0 ; i < size; i++) {

printf("%s %d\n", (p + i)->name, (p + i)->score);

}

第五题

void printfInfo(MYStudent *p,int count1, int count2,int size)

{

for (int i =0; i < size; i++) {

if ((p + i)->score >= count1 && (p + i)->score <= count2) {

printf("%s %d\n", (p + i)->name, (p + i)->score);

}

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