用C语言编程实现学生基本信息管理系统

如何用C语言编写学生信息管理系统~

参考如下学生信息管理系统的C源代码吧。
#include #include /*定义学生结构体*/struct Student{ char ID[20]; char Name[20]; float Mark1; float Mark2; float Mark3; float Average;};/*声明学生数组及学生数量*/struct Student students[1000];int num=0;/*求平均值*/float Avg(struct Student stu){ return (stu.Mark1+stu.Mark2+stu.Mark3)/3;}/*通过学号返回数组下标*/int Student_SearchByIndex(char id[]){ int i; for (i=0;i<num;i++) { if (strcmp(students[i].ID,id)==0) { return i; } } return -1;}/*通过姓名返回数组下标*/int Student_SearchByName(char name[]){ int i; for (i=0;i<num;i++) { if (strcmp(students[i].Name,name)==0) { return i; } } return -1;}/*显示单条学生记录*/void Student_DisplaySingle(int index){ printf("%10s%10s%8s%8s%8s%10s
","学号","姓名","成绩","成绩","成绩","平均成绩"); printf("-------------------------------------------------------------
"); printf("%10s%10s%8.2f%8.2f%8.2f%10.2f
",students[index].ID,students[index].Name, students[index].Mark1,students[index].Mark2,students[index].Mark3,students[index].Average);}/*插入学生信息*/void Student_Insert(){ while(1) { printf("请输入学号:"); scanf("%s",&students[num].ID); getchar(); printf("请输入姓名:"); scanf("%s",&students[num].Name); getchar(); printf("请输入成绩:"); scanf("%f",&students[num].Mark1); getchar(); printf("请输入成绩:"); scanf("%f",&students[num].Mark2); getchar(); printf("请输入成绩:"); scanf("%f",&students[num].Mark3); getchar(); students[num].Average=Avg(students[num]); num++; printf("是否继续?(y/n)"); if (getchar()=='n') { break; } }}/*修改学生信息*/void Student_Modify(){ //float mark1,mark2,mark3; while(1) { char id[20]; int index; printf("请输入要修改的学生的学号:"); scanf("%s",&id); getchar(); index=Student_SearchByIndex(id); if (index==-1) { printf("学生不存在!
"); } else { printf("你要修改的学生信息为:
"); Student_DisplaySingle(index); printf("-- 请输入新值--
"); printf("请输入学号:"); scanf("%s",&students[index].ID); getchar(); printf("请输入姓名:"); scanf("%s",&students[index].Name); getchar(); printf("请输入成绩:"); scanf("%f",&students[index].Mark1); getchar(); printf("请输入成绩:"); scanf("%f",&students[index].Mark2); getchar(); printf("请输入成绩:"); scanf("%f",&students[index].Mark3); getchar(); students[index].Average=Avg(students[index]); } printf("是否继续?(y/n)"); if (getchar()=='n') { break; } }}/*删除学生信息*/void Student_Delete(){ int i; while(1) { char id[20]; int index; printf("请输入要删除的学生的学号:"); scanf("%s",&id); getchar(); index=Student_SearchByIndex(id); if (index==-1) { printf("学生不存在!
"); } else { printf("你要删除的学生信息为:
"); Student_DisplaySingle(index); printf("是否真的要删除?(y/n)"); if (getchar()=='y') { for (i=index;i<num-1;i++) { students[i]=students[i+1];//把后边的对象都向前移动 } num--; } getchar(); } printf("是否继续?(y/n)"); if (getchar()=='n') { break; } }}/*按姓名查询*/void Student_Select(){ while(1) { char name[20]; int index; printf("请输入要查询的学生的姓名:"); scanf("%s",&name); getchar(); index=Student_SearchByName(name); if (index==-1) { printf("学生不存在!
"); } else { printf("你要查询的学生信息为:
"); Student_DisplaySingle(index); } printf("是否继续?(y/n)"); if (getchar()=='n') { break; } }}/*按平均值排序*/void Student_SortByAverage(){ int i,j; struct Student tmp; for (i=0;i<num;i++) { for (j=1;j<num-i;j++) { if (students[j-1].Average<students[j].Average) { tmp=students[j-1]; students[j-1]=students[j]; students[j]=tmp; } } }}/*显示学生信息*/void Student_Display(){ int i; printf("%10s%10s%8s%8s%8s%10s
","学号","姓名","成绩","成绩","成绩","平均成绩"); printf("-------------------------------------------------------------
"); for (i=0;i<num;i++) { printf("%10s%10s%8.2f%8.2f%8.2f%10.2f
",students[i].ID,students[i].Name, students[i].Mark1,students[i].Mark2,students[i].Mark3,students[i].Average); }}/*将学生信息从文件读出*/void IO_ReadInfo(){ FILE *fp; int i; if ((fp=fopen("Database.txt","rb"))==NULL) { printf("不能打开文件!
"); return; } if (fread(&num,sizeof(int),1,fp)!=1) { num=-1; } else { for(i=0;i<num;i++) { fread(&students[i],sizeof(struct Student),1,fp); } } fclose(fp);}/*将学生信息写入文件*/void IO_WriteInfo(){ FILE *fp; int i; if ((fp=fopen("Database.txt","wb"))==NULL) { printf("不能打开文件!
"); return; } if (fwrite(&num,sizeof(int),1,fp)!=1) { printf("写入文件错误!
"); } for (i=0;i<num;i++) { if (fwrite(&students[i],sizeof(struct Student),1,fp)!=1) { printf("写入文件错误!
"); } } fclose(fp);}/*主程序*/void main(){ int choice; IO_ReadInfo(); while(1) { /*主菜单*/ printf("
------ 学生成绩管理系统------
"); printf("1. 增加学生记录
"); printf("2. 修改学生记录
"); printf("3. 删除学生记录
"); printf("4. 按姓名查询学生记录
"); printf("5. 按平均成绩排序
"); printf("6. 退出
"); printf("请选择(1-6):"); scanf("%d",&choice); getchar(); switch(choice) { case 1: Student_Insert(); break; case 2: Student_Modify(); break; case 3: Student_Delete(); break; case 4: Student_Select(); break; case 5: Student_SortByAverage(); Student_Display(); break; case 6: exit(0); break; } IO_WriteInfo(); }}

可以参考
#include "stdio.h" /*I/O函数*/
#include "stdlib.h" /*其它说明*/
#include "string.h" /*字符串函数*/
#include "conio.h" /*屏幕操作函数*/
#include "mem.h" /*内存操作函数*/
#include "ctype.h" /*字符操作函数*/
#include "alloc.h" /*动态地址分配函数*/
struct score
{
int mingci;
char xuehao[8];
char mingzi[20];
float score[6];
}data,info[1000];
int i,j,k=0;
char temp[20],ch;
FILE *fp,*fp1;

void shuru()
{
if((fp=fopen("s_score.txt","ab+"))==NULL)
{
printf("cannot open this file.
");
getch();exit(0);
}
for(i=0;i<=1000;i++)
{
printf("
Please shuru xuehao:");
gets(data.xuehao);
printf("Please shuru mingzi:");
gets(data.mingzi);
printf("Please shuru yuwen score:");
gets(temp);data.score[0]=atof(temp);
printf("Please shuru shuxue score:");
gets(temp);data.score[1]=atof(temp);
printf("Please input yingyu score:");
gets(temp);data.score[2]=atof(temp);
printf("Please shuru wuli score:");
gets(temp);data.score[3]=atof(temp);
printf("Please shur huaxue score:");
gets(temp);data.score[4]=atof(temp);
data.score[5]=data.score[0]+data.score[1]+data.score[2]+data.score[3]+data.score[4];
fwrite(&data,sizeof(data),1,fp);
printf("another?y/n");
ch=getch();
if(ch=='n'||ch=='N')
break;
} fclose(fp);
}
void xianshi()
{
float s;int n;
if((fp=fopen("s_score.txt","rb+"))==NULL)
{
printf("Cannot reading this file.
");
exit(0);
}
for(i=0;i<=1000;i++)
{
if((fread(&info[i],sizeof(info[i]),1,fp))!=1)
break;
}
printf("
xuehao mingzi yuwen shuxue yingyu wuli huauxue zhongfen
");
for(j=0,k=1;j<i;j++,k++)
{
info[j].mingci=k;
printf("%6s %8s %3.1f %3.1f %3.1f %3.1f %3.1f %3.1f
",info[j].xuehao,info[j].mingzi,info[j].score[0],info[j].score[1],info[j].score[2],info[j].score[3],info[j].score[4],
info[j].score[5]);
}
getch();
fclose(fp);
}

void xiugai()
{
if((fp=fopen("s_score.txt","rb+"))==NULL||(fp1=fopen("temp.txt","wb+"))==NULL)
{
printf("Cannot open this file.
");
exit(0);
}
printf("
PLease shuru xiugai xuehao:");
scanf("%d",&i); getchar();
while((fread(&data,sizeof(data),1,fp))==1)
{
j=atoi(data.xuehao);
if(j==i)
{
printf("xuehao:%s
mingzi:%s
",data.xuehao,data.mingzi);
printf("Please shuru mingzi:");
gets(data.mingzi);
printf("Please shuru yuwen score:");
gets(temp);data.score[0]=atof(temp);
printf("Please shuru shuxue score:");
gets(temp);data.score[1]=atof(temp);
printf("Please input yingyu score:");
gets(temp);data.score[2]=atof(temp);
printf("Please input wuli score:");
gets(temp);data.score[3]=atof(temp);
printf("Please input huaxue score:");
gets(temp);data.score[4]=atof(temp);
data.score[5]=data.score[0]+data.score[1]+data.score[2]+data.score[3]+data.score[4];

} fwrite(&data,sizeof(data),1,fp1);
}
fseek(fp,0L,0);
fseek(fp1,0L,0);
while((fread(&data,sizeof(data),1,fp1))==1)
{
fwrite(&data,sizeof(data),1,fp);
}

fclose(fp);
fclose(fp1);
}
void chazhao()
{
if((fp=fopen("s_score.txt","rb"))==NULL)
{
printf("
Cannot open this file.
");
exit(0);
}
printf("
PLease shuru xuehao chakan:");
scanf("%d",&i);
while(fread(&data,sizeof(data),1,fp)==1)
{
j=atoi(data.xuehao);
if(i==j)
{
printf("xuehao:%s mingzi:%s
yuwen:%f
shuxue:%f
yingyu:%f
wuli:%f
huaxue:%f
",data.xuehao,data.mingzi,data.score[0],data.score[1],data.score[2],data.score[3],data.score[4],data.score[5]);
}getch();
}
}
void shanchu()
{
if((fp=fopen("s_score.txt","rb+"))==NULL||(fp1=fopen("temp.txt","wb+"))==NULL)
{
printf("
open score.txt was failed!");
getch();
exit(0);
}
printf("
Please input ID which you want to del:");
scanf("%d",&i);getchar();
while((fread(&data,sizeof(data),1,fp))==1)
{
j=atoi(data.xuehao);
if(j==i)
{

printf("Anykey will delet it.
");
getch();
continue;
}
fwrite(&data,sizeof(data),1,fp1);
}
fclose(fp);
fclose(fp1);
remove("s_score.txt");
rename("temp.txt","s_score.txt");
printf("Data delet was succesful!
");
printf("Anykey will return to main.");
getch();
}
main()
{
while(1)
{
clrscr(); /*清屏幕*/
gotoxy(1,1); /*移动光标*/
textcolor(YELLOW); /*设置文本显示颜色为黄色*/
textbackground(BLUE); /*设置背景颜色为蓝色*/
window(1,1,99,99); /* 制作显示菜单的窗口，大小根据菜单条数设计*/
clrscr();
printf("*************welcome to use student manage******************
");
printf("*************************menu********************************
");
printf("* ========================================================= *
");
printf("* 1>shuru 2>xiugai *
");
printf("* 3>shanchu 4>chazhao *
");
printf("* 5>xianshi 6>exit *
");
printf("* *
");
printf("* --------------------------------------------------------- *
");
printf(" Please input which you want(1-6):");
ch=getch();
switch(ch)
{
case '1':shuru();break;
case '2':xiugai(); break;
case '3':shanchu(); break;
case '4':chazhao(); break;
case '5':xianshi(); break;
case '6':exit(0);
default: continue;
}
}
}

以前做过的类似的一个 你拿去看看改改

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BUFSIZE  1024
#define WORDSIZE  32
#define DESTSIZE 512
#define NR 26
struct node_st {
 struct node_st *arr[NR];
 char *str;
};
static int pos_hash(char ch)
{
 return ch - 'a';
}
static int read_file(FILE *fp, char *word, char *dest)
{
 char buf[BUFSIZE] = {}; 
 if (fgets(buf, BUFSIZE, fp) == NULL)
  return -1;
 buf[strlen(buf)-1] = 0;
 sscanf(buf, "%s %s", word, dest);
 return 0;
}
static void tree_insert(struct node_st **root, const char *word, const char *dest)
{
 struct node_st *new;
 int i;
 if (*root == NULL) {
  new = malloc(sizeof(*new)); 
  //if error
  for (i = 0; i < NR; i++)
   (new->arr)[i] = NULL;
  new->str = NULL;
  *root = new; 
 }
 if (*word == '\0') {
  (*root)->str = strdup(dest);
  return;
 }
 tree_insert(&((*root)->arr)[pos_hash(*word)], word+1, dest);
}
static char *tree_search(struct node_st *root, char *word)
{
 if (root == NULL)
  return NULL; 
 if (*word == '\0')
  return root->str;
 tree_search((root->arr)[pos_hash(*word)], word+1);
}
int main(int argc, char **argv)
{
 FILE *fp;
 struct node_st *root = NULL;
 char word[WORDSIZE] = {};
 char dest[DESTSIZE] = {};
 char *ret;
 if (argc < 3)
  return 1;
 fp = fopen(argv[1], "r");
 //if error
 while (1) {
  if (read_file(fp, word, dest) < 0)
   break;
  tree_insert(&root, word, dest);
  
  memset(word, '\0', WORDSIZE);
  memset(dest, '\0', DESTSIZE);
 }
#if 1
 if ((ret = tree_search(root, argv[2])) == NULL)
  printf("the word is wrong
");
 else
  printf("%s: %s
", argv[2], ret);
#endif
 return 0;
}

 悬赏50也来求答案。送个红包吧

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