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#define LEN sizeof(struct student)

#include

#include

#include

struct student

{

int num;

char name[20];

int score[3];

int aver;

}; void personal_information_input(FILE *fp)

{

struct student *p;

int a,i,n;

printf("请输入将要输入的学生个数: ");

scanf("%d",&n);

printf("请输入学生的学号姓名和三科成绩:\n");

for(i=0;i

{

a=i+1;

printf("%d:",a);

p=(struct student *)malloc(LEN);

scanf("%d%s%d%d%d",&p->num,&p->name,&p->score[0],&p->score[1],&p->score[2]);

fwrite(p,LEN,1,fp);

p++;

}

} void personal_information_print(FILE *fp)

{

struct student *p,*p1;

int i=0;

p=(struct student *)malloc(LEN);

printf("请输入需要查找的学生的学号: ");

scanf("%d",&p->num);

p1=(struct student *)malloc(LEN);

fread(p1,LEN,1,fp);

while(!feof(fp))

{

fread(p1,LEN,1,fp);

if(p1->num==p->num)

printf("学号:%d 姓名:%s 成绩:%d %d %d 平均成绩:%d\n",

p->num,p->name,p->score[0],p->score[1],p->score[2],p->aver);

p1++;

fread(p1,LEN,1,fp);

}

} void average(FILE *fp)

{

struct student *p1;

p1=(struct student *)malloc(LEN);

fread(p1,LEN,1,fp);

while(!feof(fp))

{

p1->aver=(p1->score[0]+p1->score[1]+p1->score[2])/3.0;

fwrite(p1,LEN,1,fp);

p1++;

// p1=(struct student *)malloc(LEN);

fread(p1,LEN,1,fp);

}

}

void score_output(FILE *fp)

{

struct student *p1;

p1=(struct student *)malloc(LEN);

fread(p1,LEN,1,fp);

while(!feof(fp))

{

printf("学号:%d 姓名:%s 成绩:%d %d %d 平均成绩:%d\n",

p1->num,p1->name,p1->score[0],p1->score[1],p1->score[2],p1->aver);

// p1=(struct student *)malloc(LEN);

p1++;

fread(p1,LEN,1,fp);

}

}

void score_search(FILE *fp)

{

struct student *p,*p1;

p=(struct student *)malloc(LEN);

printf("输入要查找的学生成绩: ");

scanf("%d",&p->score[0]);

p1=(struct student *)malloc(LEN);

fread(p1,LEN,1,fp);

while(!feof(fp))

{

if(p1->score[0]==p->score[0])

printf("学号:%d 姓名:%s 成绩:%d %d %d 平均成绩:%d\n",

p1->num,p1->name,p1->score[0],p1->score[1],p1->score[2],p1->aver);

else if(p1->score[1]==p->score[0])

printf("学号:%d 姓名:%s 成绩:%d %d %d 平均成绩:%d\n",

p1->num,p1->name,p1->score[0],p1->score[1],p1->score[2],p1->aver);

else if(p1->score[2]==p->score[0])

printf("学号:%d 姓名:%s 成绩:%d %dd %d 平均成绩:%d\n",

p1->num,p1->name,p1->score[0],p1->score[1],p1->score[2],p1->aver);

p1=(struct student *)malloc(LEN);

fread(p1,LEN,1,fp);

p1++;

}

} void main()

{

char ch;

FILE *fp;

char filename[20];

printf("请输入所用的文件名:");

scanf("%s",filename);

if((fp=fopen(filename,"ab+"))==NULL)

{

printf("无法打开此文件!\n");

exit(0);

}

else

{ fp=fopen(filename,"wb+"); }

ch=getchar();

while(1)

{

printf("\n******************欢迎使用学生信息管理系统********************\n");

printf("\n******************** 1. 个人信息的录入 ********************\n");

printf("\n******************** 2. 个人信息的输出 ********************\n");

printf("\n******************** 3. 计算平均成绩 ********************\n");

printf("\n******************** 4. 成绩的查询 ********************\n");

printf("\n******************** 5. 成绩的输出 ********************\n");

printf("\n******************** 6. 退出程序 ********************\n");

printf("\n************ 请选择上述选项执行相应的操作 ************\n");

printf("************** 你选择执行的选项是: ");

ch=getchar();

switch (ch)

{

case '1':personal_information_input(fp);break;

case '2':personal_information_print(fp);break;

case '3':average(fp);break;

case '4':score_search(fp);break;

case '5':score_output(fp);break;

case '6':exit(0);

default: break;

}

getchar();

}

}