用C语言编的学生成绩的信息管理

2025-03-17 12:48:04

推荐回答（1个）

回答1：

#include"stdio.h"
#include"stdlib.h"
#include"string.h"
#include"process.h"

/*单链表结构*/
typedef struct LNote {
char num[15];
char name[10];
int score;
struct LNote *next;
}LNote,*List;

/*初始化*/
List Start()
{
List L;
L=(List)malloc(sizeof(LNote));
L->next=NULL;
return L;
}

/*插入并排序*/
void Insert(List L,char num[],char name[],int score)
{
List pre,p,s;
p=L;
s=(List)malloc(sizeof(LNote));
strcpy(s->num,num);
strcpy(s->name,name);
s->score=score;
do {
pre=p;
p=p->next;
} while(p!=NULL&&s->scorescore);
s->next=pre->next;
pre->next=s;
printf("\n\t\t\t\t插入成功");
}

/*删除*/
void Delete(List L,char num[])
{
List pre,p;
p=L;
if(p->next==NULL) {
printf("\n\t\t\t\t记录为空");
goto end;
}
while(p!=NULL&&strcmp(p->num,num)!=0) {
pre=p;
p=p->next;
}
if(p==NULL) {
printf("\n\t\t\t\t没有该学生的数据");
goto end;
}
if(strcmp(p->num,num)==0) {
pre->next=p->next;
free(p);
printf("\n\t\t\t\t删除成功");
}
end:
printf("\n");
}

/*遍历*/
void Traverse(List L)
{
List p;
p=L->next;
if(p==NULL)
printf("\n\t\t\t\t没有记录");
else {
printf("\n\t\t学号\t\t姓名\t成绩\n");
while(p!=NULL) {
printf("\t\t%-15s%-10s%-5d\n",p->num,p->name,p->score);
p=p->next;
}
}
}

/*查找*/
void Find(List L,char num[])
{
List p;
p=L;
while(p!=NULL&&strcmp(p->num,num)!=0)
p=p->next;
if(p==NULL)
printf("\t\t\t\t没有找到");
else {
printf("\n\t\t学号\t\t姓名\t成绩\n");
printf("\t\t%-15s%-10s%-5d",p->num,p->name,p->score);
}
}

/*保存*/
void Save(List L)
{
FILE *fp;
List p;
p=L->next;
if((fp=fopen("学生管理.txt","w"))==NULL) {
printf("文件打开失败\n");
exit(1);
}
while(p!=NULL) {
fprintf(fp,"%-15s%-10s%-4d\n",p->num,p->name,p->score);
p=p->next;
}
printf("\n\t\t\t\t保存成功");
}

/*统计*/
void Tegether(List L)
{
List p,q;
float a=0,b=0,c=0,length=0;
q=L->next;
while(q!=NULL) {
length++;
q=q->next;
}
if(length==0)
printf("\n\t\t\t\t记录为空\n");
else {
p=L->next;
while(p!=NULL) {
if(p->score>=80&&p->score<=100)
a++;
if(p->score>=60&&p->score<80)
b++;
if(p->score>=0&&p->score<60)
c++;
p=p->next;
}
printf("\n\t优秀%.0f人数\t及格%.0f人\t\t不及格%.0f人\n",a,b,c);
printf("\t优秀率%-3.2f\t及格率%-3.2f\t不及格率%-3.2f",a/length,b/length,c/length);
}
}

/*读取文件*/
void Read(List L)
{
FILE *fp;
char num[15];
char name[10];
int score;
List s,pre;
if((fp=fopen("学生管理.txt","r+"))==NULL)
printf("文件打开失败");
printf("%s\t\t%s\t%s\n","学号","姓名","成绩");
pre=L;
while(!feof(fp)) {
fscanf(fp,"%s%s%d\n",num,name,&score);
printf("%-15s%-10s%-4d\n",num,name,score);

s=(List)malloc(sizeof(LNote));
strcpy(s->num,num);
strcpy(s->name,name);
s->score=score;

pre->next=s;
pre=s;
}
s->next=NULL;
if(fclose(fp))
printf("文件关闭失败");
}

int scan()
{
int d,c=2;
printf("\t\t\t\t%c 1.初始化 %c\n\n",c,c);
printf("\t\t\t\t%c 2.输入数据 %c\n\n",c,c);
printf("\t\t\t\t%c 3.删除数据 %c\n\n",c,c);
printf("\t\t\t\t%c 4.遍历 %c\n\n",c,c);
printf("\t\t\t\t%c 5.保存为数据文件 %c\n\n",c,c);
printf("\t\t\t\t%c 6.查找 %c\n\n",c,c);
printf("\t\t\t\t%c 7.统计 %c\n\n",c,c);
printf("\t\t\t\t%c 8.读取数据文件 %c\n\n",c,c);
printf("\t\t\t\t%c 9.退出 %c\n\n",c,c);
do {
printf("\t\t\t\t 输入操作:");
scanf("%d",&d);
if(d<=0||d>9)
printf("\n\t\t\t\t无此操作\n\n");
} while(d<0||d>9);
return d;
}

main()
{
int quit=0,score;
char name[10],num[15];
List L;
L=Start();
printf("\t\t\t\t***** 欢迎使用 *****\n\n");
while(!quit) {
switch(scan()) {
case 1:
Start();
printf("\n\n");
break;
case 2:
printf("\n\t\t\t\t学号:");
scanf("%s",num);
printf("\n\t\t\t\t姓名:");
scanf("%s",name);
printf("\n\t\t\t\t分数:");
scanf("%d",&score);
Insert(L,num,name,score);
printf("\n\n");
break;
case 3:
printf("\n\t\t\t\t输入学号:");
scanf("%s",num);
Delete(L,num);
printf("\n");
break;
case 4:
Traverse(L);
printf("\n\n");
break;
case 5:
Save(L);
printf("\n\n");
break;
case 6:
printf("\n\t\t\t\t输入学号:");
scanf("%s",num);
Find(L,num);
printf("\n\n");
break;
case 7:
Tegether(L);
printf("\n\n");
break;
case 8:
Read(L);
printf("\n\n");
break;
case 9:
quit=1;
break;
}
}
}

最新问答

父母都是农民，农村户口，低保户可申请公租房吗？

魔兽世界德拉诺之王怎么去德拉诺

wifi密码加密方式有哪些最近听说有一种加密方式可以使你的手机知道密码也连接不上必须

从义桥收费站到平湖收费站多少公里路

安卓手机通讯录最多可以存多少号码？

众泰z300新视界版改进了哪些缺陷