题目

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解决代码及点评


/*

4.	将存放在worker1.rec中的职工数据按工资高低排序，

	将排好序的各记录存放在 worker2.rec中(用 fread和fwrite函数）。

*/

#include <stdio.h>

#include <stdlib.h>

typedef struct Staff_9_4

{

	int num;

	char name[30];

	char sex[5];

	int age;

	float salary;

} Employee;

/*

	读取员工信息

*/

void readAllInfo94(Employee *tempEmp,int fileType)

{

	Employee temp;

	FILE *fp = NULL;

	if (fileType == 1)

	{

		fopen_s(&fp, "worker1.rec","rb");

	}

	else if (fileType == 2)

	{

		fopen_s(&fp, "worker2.rec","rb");

	}

	if (fp)

	{

		int i = 0;

		fread(&temp,sizeof(temp),1,fp);

		while(!feof(fp))

		{

			tempEmp[i] = temp;

			printf("num = %d,name = %s,sex = %s,age = %d,salary = %f\n",

					tempEmp[i].num,tempEmp[i].name,tempEmp[i].sex,tempEmp[i].age,tempEmp[i].salary);

			fread(&temp,sizeof(temp),1,fp);

			tempEmp[i] = temp;

			i++;

		}

		fclose(fp);

	}

	else

	{

		printf("open file failed!");

	}

}

/*

	按照工资从高到低排序

*/

void sortAllEmp94(Employee *emp,int n)

{

	Employee tempEmp;

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

	{

		for (int j = i + 1; j < n; j++)

		{

			if (emp[i].salary < emp[j].salary)

			{

				tempEmp = emp[i];

				emp[i]  = emp[j];

				emp[j]  = tempEmp;

			}

		}

	}

}

/*

	保存员工信息

*/

void saveAllInfo94(Employee * emp,int n)

{

	FILE *fp = NULL;

	fopen_s(&fp, "worker2.rec","wb");

	if (fp)

	{

		for (int i = 0; i < n; i++)

		{

			fwrite(&emp[i],sizeof(emp[i]),1,fp);

		}

		fclose(fp);

	}

	else

	{

		printf("open file failed!");

	}

}

void main()

{

	const int N = 10;

	Employee emp[N];

	//读取所有员工保存到emp

	printf("排序前的数据：\n");

	readAllInfo94(emp,1);//参数1表示打开worker1.rec文件

	//给emp排序

	sortAllEmp94(emp,N);

	//保存排序后的员工信息

	saveAllInfo94(emp,N);

	printf("排序后的数据：\n");

	//排序后员工的信息

	readAllInfo94(emp,2);//参数2表示打开worker2.rec文件

	system("pause");

}

代码编译以及运行

由于资源上传太多，资源频道经常被锁定无法上传资源，同学们可以打开VS2013自己创建工程，步骤如下：

1）新建工程