要求有5个功能。1 输入功能：录入学生信息；
2 显示功能：完成学生记录的显示；
3 查找功能：完成查看所有学生，按学号或姓名查找学生的相关记录，并显示；
4 更新功能：（增加或删除）。
利用结构体数组实现学生信息的数据结构设计，且各个功能模块用函数的形式实现。（加注释的话更好）
#include
#include
#include
#include
#include
struct studentding{
char name[19];
int goal[3];
int xuenum;
};
int stunum;
struct studentding student;
int searchnum;
int cmp(const void*a,const void *b)//¿ìÅŵĶԱȺ¯Êý
{
return (((struct studentding )a).xuenum-((struct studentding )b).xuenum>0?1:-1);
}
void inputmes()//ÊäÈë
{
int x;
puts("How many students do you have ?");
scanf("%d",&stunum);
student=(struct studentding *)malloc(stunum*sizeof(struct studentding)); //¶¯Ì¬ÄÚ´æ·ÖÅä¸ø½á¹¹ÌåÊý×é
for(x=0;x {
printf("input a student id:");
scanf("%d",&student[x].xuenum);
getchar();
printf("input a student name contain less than 19 characters:");
gets((student+x)->name);
printf("input 3 scores:");
scanf("%d%d%d",&student[x].goal[0],&student[x].goal[1],&student[x].goal[2]);
while(getchar()!='\n');//³ÔµôÈ«²¿µÄ»»Ðзû
}
qsort(student,stunum,sizeof(struct studentding),cmp);//¿ìÅŵÄÔËÓÃ
}
void outputmes()
{
int x;
printf("please input the id of the student which you want to search:");
scanf("%d",&searchnum);
getchar();
x=search();
if(x>=0)
{
printf("student id:%d name :\t%s,scores:",student[x].xuenum,student[x].name);
printf("<%d %d %d>\n",student[x].goal[0],student[x].goal[1],student[x].goal[2]);
}
else
return;
}
int search()//¶þ·Ö·¨²éÕÒ
{
int x;
if(searchnum==student[stunum/2].xuenum)
return stunum/2;
else if(searchnum>student[stunum/2].xuenum)
{
for(x=stunum/2;x if(searchnum==student[x].xuenum)
return x;
puts("Not found!");
return -1;
}
else if(searchnum {
for(x=stunum/2;x>=0;x--)
if(searchnum==student[x].xuenum)
return x;
puts("Not found!");
return -1;
}
}
void dele()//ɾ³ýѧÉúÐÅÏ¢
{
int x;
int y;
printf("please input the student id which you want to delete:");
scanf("%d",&searchnum);
getchar();
x=search();
if(x>=0)
{
memmove(&student[x],&student[x+1],sizeof(student[0])(stunum-x-1));
stunum-=1;
}
else
return;
}
int main()
{
char ch;
inputmes();
while(1)//Èý¸öÑ¡Ïî
{
puts("what do you select ? please press not input\na:search a student and his massage.\nb:delete a student\nc:exit ");
ch=getch();
if(ch=='a')//Ñ¡ÔñµÄ²Ëµ¥
{
outputmes();
puts("press r to return");
ch=getch();
system("cls");
}
else if(ch=='b')
{
dele();
puts("press r to return");
ch=getch();
system("cls");
}
else if(ch=='c')//Í˳öµÄÌõ¼þ
return;
else
{
puts("No,please press a ,b or c");
sleep(1);
system("cls");
}
}
}
去年学c时候做的，感觉应该还能用