学生管理系统 C语言代码.docx

#includestdio.h#includestdlib.h#includestring.hstruct stu_info1char num13;/学号char name10;/姓名char sex5;/性别char cls20;/班级stu16;struct stu_info2char counum6;/课程号char counam20;/课程名称int credit;/学分stu26;struct stu_info3char num13;/学号char counum6;/课程号float results;/分数stu312;struct stu_info4char num13;/学号char counum6;/课程号float results;/分数stu412;int n=11;void main()void gengxin();void input1();void input2();void input3();void output();void xianshi();void chaxun();void printf1();void printf2();input1();input2();output(); int i;loop: ; printf(*欢迎使用分数查询系统*n); printf(* 请选择 *n); printf(* 1.录入2.删除无用信息(管理员功能) *n); printf(* 3.显示4.查询(学生功能) *n); printf(* 5.显示学生信息6.显示课程信息 *n); printf(* 7.退出 *n); printf(*n); scanf(%d,&i);switch(i)case 1: input3();break;case 2:gengxin();break;case 3:xianshi();goto loop; case 4: chaxun();goto loop;case 5:printf1();goto loop;case 6: printf2();goto loop;case 7:break; default:printf(error);break;void input1()/录入结构体stu1int i;FILE *fp;if(fp=fopen(A.txt,r)=NULL)printf(can not open filen);exit(0);/*printf( 学号 姓名 性别 班级n);*/for(i=0;i=5;i+)fscanf(fp,%s%s%s%s,&stu1i.num,&,&stu1i.sex,&stu1i.cls);/*printf(%-13s %-10s %-5s %-20sn,stu1i.num,,stu1i.sex,stu1i.cls);*/ fclose(fp);void input2()/录入结构体stu2int i;FILE *fp;if(fp=fopen(B.txt,r)=NULL)printf(can not open filen);exit(0);for(i=0;i=5;i+)fscanf(fp,%s%s%d,&stu2i.counum,&stu2i.counam,&stu2i.credit); fclose(fp);void input3()/录入成绩 FILE *fp;fp=fopen(C.txt,w);int a,i,j,k;float cetss;char number13,cnum6,mima10;printf(请输入管理员密码n);scanf(%s,mima);if(strcmp(mima,abc111)=0)printf(请输入要录入学生成绩的个数n);scanf(%d,&a);for(i=1;i=a;i+)printf(请输入要录入的第%d同学的学号:,i);scanf(%s,number);printf(请输入要录入的第%d同学的课程号:,i);scanf(%s,cnum);for(j=0;j=5;j+)/学号if(strcmp(number,stu1j.num)=0)break;if(j=5)for(k=0;k5|k5)printf(Error,please input again);i=i-1;printf(录入成功n);elseprintf(密码错误n);void output()/ 录入结构体stu3int i;FILE *fp=fopen(C.txt,r);for(i=0;in;i+)fscanf(fp,%s%s%f,&stu3i.num,&stu3i.counum,&stu3i.results);/*printf(%s%s%fn,stu3i.num,stu3i.counum,stu3i.results);*/ fclose(fp);void xianshi()/ 显示成绩int i,j;for(i=0;in;i+)for(j=0;j6;j+)if(strcmp(stu3i.num,stu1j.num)=0)printf(%st,);for(j=0;j6;j+)if(strcmp(stu3i.counum,stu2j.counum)=0)printf(%st,stu2j.counam);printf(%3.1fn,stu3i.results);void chaxun()/查询功能char number13,c;int i,j,k,a,b,d;while(c=getchar()!=Q)a=0,b=0;/a记录学分 b记录学科printf(请输入要查询同学的学号n);scanf(%s,number);for(i=0;in;i+)if(strcmp(number,stu3i.num)=0)printf(学号：%st,stu3i.num);for(j=0;j6;j+)if(strcmp(stu3i.num,stu1j.num)=0)printf(姓名：%sn,);break;d=i;for(i=0;in;i+)if(strcmp(number,stu3i.num)=0)b=b+1;for(j=0;j6;j+)if(strcmp(stu3i.num,stu1j.num)=0)for(k=0;k=60)a=a+stu2k.credit;printf(课程号：%st课程名称：%st成绩：%3.1ft实得学分：%dn,stu3i.counum,stu2k.counam,stu3i.results,stu2k.credit);elseprintf(课程号：%st课程名称：%st成绩：%3.1ft实得学分：%dn,stu3i.counum,stu2k.counam,stu3i.results,0);if(dn)printf(共修%d科tt实得总学分:%dn,b,a);elseprintf(学号输入错误n);getchar();printf(退出请按Q+回车，继续查询请按回车键);void gengxin()/更新信息，删除C.txt中无用信息 FILE *fp;int i,j,k;char mima10;printf(请输入管理员密码n);scanf(%s,mima);if(strcmp(mima,abc111)=0)fp=fopen(C.txt,w);for(i=0;in;i+)for(j=0;j6;j+)if(strcmp(stu3i.num,stu1j.num)=0)for(k=0;k=5;k+)if(strcmp(stu3i.counum,stu2k.counum)=0)break;if(k=5)fprintf(fp,%s %s %fn,stu3i.num,stu3i.counum,stu3i.results);printf(更新C.txt成功n);fclose(fp);elseprintf(密码错误n);void printf1()/显示学生信息int i;printf( 学号 姓名 性别 班级n);for(i=0;i=5;i+)printf(%-13s%-10s%-5s %-2