小学生文档

printf("英语:");

scanf("%lf", &t.eng);

return t;

}

void input_record() /*输入若干条记录*/

{

char choice = 'y';

while (choice == 'Y' || choice == 'y') /*判断*/

{

Stud[Student_Count] = input_a_record();

printf("还有更多的记录吗?(Y/N)");

Student_Count++;

fflush(stdin); //清除输入缓冲区

choice = getchar();

}

}

void calc_total() // 计算总分

{

int i;

for (i = 0; i

Stud[i].total = Stud[i].chi + Stud[i].math + Stud[i].eng;

}

}

void sort_by_num()//按学号排序

{

int i, j;

Student t;

for (i = 0; i

for (j = 0; j

if (Stud[j].num> Stud[j + 1].num){

t = Stud[j];

Stud[j] = Stud[j + 1];

Stud[j + 1] = t;

}

}

void sort_by_total()

{

int i, j;

Student t;

for (i = 0; i < Student_Count - 1; i++)

for (j = 0; j

if (Stud[j].total>Stud[j+1].total){

t = Stud[j];

Stud[j] = Stud[j + 1];

Stud[j + 1] = t;

}

}

int Delete_record_by_num(int num) /*按姓名查找，删除一条记录*/ {

int i, j;

int found = -1; //记录查找到的记录下标

for (i = 0; i

if (Stud[i].num == num){

found = i;

break;

}

}

if (found != -1){

for (j = found; j

{

Stud[j] = Stud[j + 1];

}

Student_Count--;

return 0;

}

return(-1);

}

void Delete_a_record()

{

int num;

printf("请输入要删除的学生学号:"); /*交互式问寻*/

scanf("%d", &num);

if (Delete_record_by_num(num) == 0)

printf("删除成功");

else

printf("删除失败");

}

Student *query_a_record_by_name(char *name)

{

int i = 0;

while ((strcmp(Stud[i].name, name) != 0) && i < Student_Count)

i++;

if (i == Student_Count)

return NULL;

return &Stud[i];

}

void query_a_record()

{

//fflush(stdin);

char chname[20];

getchar();

printf("请输入要查找的名字：");

gets(chname);

display_header();

display_a_record(query_a_record_by_name(&chname));

}

void Statistic() /*输出统计信息*/

{

int i;

int pc, pm, pe, gc, gm, ge;

pc = pm = pe = gc = gm = ge = 0;

Student pass = { 0, "及格率", 0, 0, 0, 0 }, good = { 0, "优秀率", 0, 0, 0, 0 };

Student max = { -1, "最高分", 0, 0, 0, 0 }, aver = { -1, "平均分", 0, 0, 0, 0 };

for (i = 0; i

aver.chi += Stud[i].chi;

aver.math += Stud[i].math;

aver.eng += Stud[i].eng;

aver.total += Stud[i].total;

if (Stud[i].chi>max.chi) max.chi = Stud[i].chi;

if (Stud[i].math>max.math) max.math = Stud[i].math;

if (Stud[i].eng>max.eng) max.eng = Stud[i].eng;

if (Stud[i].total>max.total) max.total = Stud[i].total;

if (Stud[i].chi>59) pc++;

if (Stud[i].math>59) pm++;

if (Stud[i].eng>59) pe++;

if (Stud[i].chi >= 90) gc++;

if (Stud[i].math >= 90) gm++;

if (Stud[i].eng >= 90) ge++;

}

aver.chi = aver.chi / Student_Count;

aver.math = aver.math / Student_Count;

aver.eng = aver.eng / Student_Count;

aver.total = aver.total / Student_Count;

pass.chi = pc / Student_Count * 100;

pass.math = pm / Student_Count * 100;

pass.eng = pe / Student_Count * 100;

good.chi = gc / Student_Count * 100;

good.math = gm / Student_Count * 100;

good.eng = ge / Student_Count * 100;

display_header();

display_a_record(&max);

display_a_record(&aver);

display_a_record(&pass);

display_a_record(&good);

}

void read_textfile() /*从文件中读入数据*/

{

int i = 0;

FILE *fp; /*定义文件指针*/

fflush(stdin);

if ((fp = fopen("students.txt", "r")) == NULL) /*打开文件*/

{

printf("error");

return(-1);

}

fscanf(fp, "%d\n", &Student_Count); /*读入总记录量*/

for (i = 0; i

{

fscanf(fp, "%d\n", &Stud[i].num);

fscanf(fp, "%s\n", Stud[i].name);

fscanf(fp, "%lf\n,%lf\n,%lf\n", &Stud[i].chi, &Stud[i].math, &Stud[i].eng);

}

fclose(fp); /*关闭文件*/

printf("读取完成\n");

}

void write_textfile()

{

int i = 0;

FILE *fp;

if ((fp = fopen("students.txt","w")) == NULL){

printf("error");

exit(0);

}

fprintf(fp, "%d\n", Student_Count);

for (i = 0; i

fprintf(fp, "%d\n", Stud[i].num);

fprintf(fp, "%s\n", Stud[i].name);

fprintf(fp, "%lf\n,%lf\n,%lf\n",Stud[i].chi, Stud[i].math, Stud[i].eng);

}

fclose(fp);

printf("保存成功！\n");

}

void main() /*主函数*/

{

int n = 0;

char choice = ' ';

while (choice != '0')

{

display_menu();

fflush(stdin); //清空输入缓冲区

choice = getchar();

switch (choice)

{

case '1': //添加记录

input_record();

display_all_record();

break;

case '2': //显示所有记录

calc_total();

display_all_record();

break;

case '3': //按学号排序

calc_total();

sort_by_num();

display_all_record();

break;

case '4':

calc_total();

sort_by_total();

display_all_record();

break;

case '5':

Delete_a_record();

break;

case '6':

query_a_record();

break;

case '7':

Statistic();

break;

case '8':

read_textfile();

break;

case '9':

write_textfile();

break;

case '0':

printf("感谢您使用本程序，再见！\n");

exit(0); break;/*结束程序*/

}

}

}