学生成绩管理系统，计算平均分写入文件
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学生成绩管理系统，读取文件计算平均分写入文件，对平均分进行排序
# include
# include
# include
# include
# include
# define eps 1;
typedef struct
{
char name[50];
int num;
int Chinese;
int Math;
int English;
int sum;
}Node;
Node student[1000];
int n;
char text[50];
int cmp(const void *a, const void *b)
{
return (*(Node *)b).sum > (*(Node *)a).sum?1:-1;
}
int cmpnum(const void *a, const void *b)
{
return (*(Node *)a).num > (*(Node *)b).num?1:-1;
}
void showstudent()
{
void menu();
int i;
printf(" \t姓名\t学号\t语文\t数学\t英语\t总分\n");
for(i=0;i
{
printf("\t%s\t%d\t%d\t%d\t%d\t%d\n",student[i].name,student[i].num,student[i].Chinese,student[i].Math,student[i].English,student[i].sum);
}
getch();
menu();
}
void sortnum()
{
void menu();
int i,j,k;
char a[55];
for(i=0;i
{
for(j=0;j
{
if(student[j].num>student[j+1].num)
{
k=student[j].num;
student[j].num=student[j+1].num;
student[j+1].num=k;
k=student[j].Chinese;
student[j].Chinese=student[j+1].Chinese;
student[j+1].Chinese=k;
k=student[j].Math;
student[j].Math=student[j+1].Math;
student[j+1].Math=k;
k=student[j].English;
student[j].English=student[j+1].English;
student[j+1].English=k;
k=student[j].sum;
student[j].sum=student[j+1].sum;
student[j+1].sum=k;
strcpy(a,student[j].name);
strcpy(student[j].name,student[j+1].name);
strcpy(student[j+1].name,a);
}
}
}
showstudent();
getch();
menu();
}
void sortsum()
{
void menu();
qsort(student, n, sizeof(Node), cmp);
showstudent();
getch();
menu();
}
void searchnum(int number)
{
void menu();
int min = 0, max = n-1, mid;
bool escape = false;
qsort(student, n, sizeof(Node), cmpnum);
while(min <= max)
{
mid = (min + max) / 2;
if(student[mid].num > number)
{
max = mid - eps;
}
else if(student[mid].num < number)
{
min = mid + eps;
}
else
{
escape = true;
printf("\t姓名\t学号\t语文\t数学\t英语\t总分\n");
printf("\t%s\t%d\t%d\t%d\t%d\t%d\n", student[mid].name, student[mid].num, student[mid].Chinese, student[mid].Math, student[mid].English, student[mid].sum);
break;
}
}
if(!escape)
{
printf("\t查无此人");
}
getch();
menu();
}
void searchname()
{
void menu();
int i;
for(i=0;i
{
if(strcmp(text,student[i].name)==0)
{
printf("\t姓名\t学号\t语文\t数学\t英语\t总分\n");
printf("\t%s\t%d\t%d\t%d\t%d\t%d\n", student[i].name, student[i].num, student[i].Chinese, student[i].Math, student[i].English, student[i].sum);
break;
}
}
if(i>=n)
{
printf("\t查无此人\n");
}
getch();
menu();
}
void save()
{
void menu();
FILE *fp;
fp=fopen("4.txt","w");
int i;
fprintf(fp, "\t姓名\t学号\t语文\t数学\t英语\t总分\n");
for(i=0;i
{
if(student[i].Chinese<60||student[i].Math<60||student[i].English<60)
{
printf("\t%s\t%d\t%d\t%d\t%d\n",student[i].name,student[i].num,student[i].Chinese,student[i].Math,student[i].English);
fprintf(fp,"\t%s\t%d\t%d\t%d\t%d\n",student[i].name,student[i].num,student[i].Chinese,student[i].Math,student[i].English);
}
}
printf("\n");
printf("┏━━━━┓\n");
printf("┃保存成功┃\n");
printf("┗━━━━┛\n");
getch();
menu();
}
void menu()
{
int choice;
system("cls");
printf(" 菜单\n");
printf("┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓\n");
printf("┃ 0.退出 ┃\n");
printf("┃ 1.显示学生信息 ┃\n");
printf("┃ 2.显示按学号排序后的学生信息 ┃\n");
printf("┃ 3.显示按总分排序后的学生信息 ┃\n");
printf("┃ 4.按学号查学生各科分数和总分 ┃\n");
printf("┃ 5.按姓名查学生各科分数和总分 ┃\n");
printf("┃ 6.抽取出三科成绩中有补考的学生并保存 ┃\n");
printf("┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛\n");
printf(" 选择代码(0，1，2，3，4，5，6)： ");
scanf("%d", &choice);
switch(choice)
{
case 0:
{
system("cls");
printf("谢谢使用!\n");
exit(0);
}
case 1:
{
system("cls");
showstudent();
}
case 2:
{
system("cls");
sortnum();
}
case 3:
{
system("cls");
sortsum();
}
case 4:
{
system("cls");
int num;
printf("\t请输入要查找学生的学号：");
scanf("%d", &num);
searchnum(num);
}
case 5:
{
system("cls");
printf("\t请输入要查找学生的姓名：");
scanf("%s", text);
searchname();
}
case 6:
{
system("cls");
save();
}
}
}
int main()
{
void menu();
n = 0;
FILE * fp;
fp=fopen("1.txt","r+");
{
while(fscanf(fp, "%s %d %d %d %d", student[n].name, &student[n].num, &student[n].Chinese, &student[n].Math, &student[n].English)!=EOF)
{
student[n].sum = 0;
student[n].sum += student[n].Chinese;
student[n].sum += student[n].Math;
student[n].sum += student[n].English;
n++;
}
fclose(fp);
}
fp=fopen("2.txt","r+");
{
while(fscanf(fp, "%s %d %d %d %d", student[n].name, &student[n].num, &student[n].Chinese, &student[n].Math, &student[n].English)!=EOF)
{
student[n].sum = 0;
student[n].sum += student[n].Chinese;
student[n].sum += student[n].Math;
student[n].sum += student[n].English;
n++;
}
fclose(fp);
}
menu();
return 0;
}
定义一个结构体存放成绩学号平均分，然后逐行读文件，得到一个链表，计算链表每个节点平均分，再对链表依据平均分排序，最后逐一输出到文件