void search()//课程信息查询
{
int mai_n();
FILE *fp;
struct course c;
int xuefen,time;
char kind[10];
int a,b;
printf("1.按学分查询./   /2.按课程性质查询./    /3.按开课学期查询\n");
printf("请选择查询方式，输入选项数字：   ");
scanf("%d",&b);
if(b==1)
{
printf("\n 请输入要查询的学分:\n");
scanf("%d",&xuefen);
if((fp=fopen("course.txt","r"))==NULL)
{
printf("\nCannot open course!\n");
}
printf("课程编号 课程名称 课程性质 总学时 授课学时 实验或上机学时 学分 开课学期:\n");
for(;!feof(fp);)//文件到结尾前运行 
{fscanf(fp,"%d%s%s%d%d%d%d%d\n",&c.num,&c.name,&c.kind,&c.time,&c.ttime,&c.etime,&c.mark,&c.term);
if(c.mark==xuefen)
printf("%5d%12s%9s%9d%9d%11d%11d%11d\n",c.num,c.name,c.kind,c.time,c.ttime,c.etime,c.mark,c.term);
}
}
else if(b==2){
printf("\n 请输入要查询的课程性质:\n");
scanf("%s",&kind);
if((fp=fopen("course.txt","r"))==NULL)
{
printf("\nCannot open course!\n");
}
printf("课程编号 课程名称 课程性质 总学时 授课学时 实验或上机学时 学分 开课学期:\n");
for(;!feof(fp);)
{
fscanf(fp,"%d%s%s%d%d%d%d%d\n",&c.num,&c.name,&c.kind,&c.time,&c.ttime,&c.etime,&c.mark,&c.term);
if(strcmp(c.kind,kind)==0)
printf("%5d%12s%9s%9d%9d%11d%11d%11d\n",c.num,c.name,c.kind,c.time,c.ttime,c.etime,c.mark,c.term);
}
}
else if(b==3){
printf("\n 请输入要查询的课程开课学期；\n");
scanf("%d",&time);
if((fp=fopen("course.txt","r"))==NULL)
{
printf("\nCannot open course!\n");
}
printf("课程编号 课程名称 课程性质 总学时 授课学时 实验或上机学时 学分 开课学期:\n");
for(;!feof(fp);)
{fscanf(fp,"%d%s%s%d%d%d%d%d\n",&c.num,&c.name,&c.kind,&c.time,&c.ttime,&c.etime,&c.mark,&c.term);
if(c.term==time)
printf("%5d%12s%9s%9d%9d%11d%11d%11d\n",c.num,c.name,c.kind,c.time,c.ttime,c.etime,c.mark,c.term);
}
}
else{
printf("输入错误！");
exit(1);
}
fclose(fp);
printf("\n1-返回菜单；2-退出系统\n");
scanf("%d",&a);system("cls");//清屏
if(a==1)
mai_n();
else
exit(0);
}