#include"stdio.h"#include"stdlib.h"#include"conio.h"#include"string.h"#include"windows.h"//登陆界面函数void load();void background1();void choice1();void fanhui1();void denglu();void zhuce();int chazhao();//目录界面函数void mulu();void background();void choice();void add();void xiugai();void shanchu();void del();void chaxun();void paixu();void tongji();void output();void finish();void fanhui2();void shuchu();int zongren();int chr();int enr();int mar();void back();float chinese();float english();float math();float zongmax();//登陆界面结构体struct self{char a[10];char b[10];int flg;}s[100]={{"admin","admin",1},{"1","1",1}};//目录界面结构体struct student{char num[10];char name[10];float chinese;float english;float math;float sum;int a;}stu[5]={{"1100","小明",12,18,20,50,1},{"1101","小样",20,80,60,160,1}};//登陆界面void main(){load();}void load(){background1();choice1();}void background1(){puts(" ");puts(" ");printf(" ********************************************\n");printf(" 欢迎登录学生管理系统");puts(" ");printf(" ********************************************\n");printf(" 1.登录 2.注册\n ");printf(" 请选择:");}void choice1(){int a;scanf("%d",&a);fflush(stdin);switch(a){case 1:denglu();break;case 2:zhuce();break;default:fanhui1();break;}}void fanhui1(){printf(" 输入错误!\n");printf(" 请重新输入!\n");system("cls");load();}void denglu(){struct self s2;char c;int i=0;int j=0;printf("请输入用户名:\n");scanf("%s",s2.a);fflush(stdin);puts(" ");printf("请输入密码:");c=getch();while(c!=13){printf("*");s2.b[i]=c;i++;while((c=getch())==8){if(i==0)continue;putchar('\b');putchar(' ');putchar('\b');s2.b[--i]=0;}}s2.b[i]=0;s2.flg=1;puts(" ");puts(s2.b);for(i=0;i<100;i++){if(!strcmp(s[i].a,s2.a)&&!strcmp(s[i].b,s2.b)){printf("成功!");system("cls");printf("\n\n\n\n\n\n\n\n\n\t\t\t欢迎进入学生管理系统\n\n\n");Sleep(2000);system("cls");mulu();}else{j++;}}if(j==100){fanhui1();}}void zhuce(){struct self s3;char c,d;int i,j;i=0;printf("请输入帐号:"); gets(s3.a);puts(s3.a);printf("请输入密码:");c=getch();while(c!=13){printf("*");s3.b[i]=c;i++;while((c=getch())==8){if(i==0)continue;putchar('\b');putchar(' ');putchar('\b');s3.b[--i]=0;}}s3.b[i]=0;s3.flg=1;printf("确定'y' 取消'n'");scanf("%c",&d);fflush(stdin);if(d=='y'||d=='Y'){j=chazhao();s[j]=s3;printf("注册成功!");shuchu();system("cls");fanhui1();}else{fanhui1();}}int chazhao(){int a,i;for(i=0;i<100;i++){if(s[i].flg==0){a=i;break;}}return i;}//目录界面void mulu(){background();choice();}void background(){printf("*****************************************\n");printf("/////////////////////^_^\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \ \n");printf("******************************************\n");puts(" ");printf("欢迎进入学生成绩管理系统");puts(" ");printf("****************************************\n");printf(" 请输入业务:\n");puts(" ");printf("1. 查看所有记录显示\n");printf("2. 添加学生成绩\n");printf("3. 修改学生成绩\n");printf("4. 删除学生成绩\n");printf("5. 清空记录\n");printf("6. 按要求查询学生成绩\n");printf("7. 按要求排序\n");printf("8. 按要求统计成绩\n");printf("9. 退出\n");printf("请选择:");}void choice(){int a;scanf("%d",&a);fflush(stdin);printf("%d\n",a);switch(a){case 1: output();break;case 2: add();break;case 3: xiugai();break;case 4: shanchu();break;case 5:del();break;case 6: chaxun();break;case 7: paixu();break;case 8: tongji();break;case 9:finish();break;default:system("cls");mulu();break;}}void add(){system("cls");int i;char c,a;shuchu();printf("1 输入 2 返回主界面\n");scanf("%d",&a);fflush(stdin);if(a==1){for(i=0;i<5;i++){if(stu[i].a==0)break;}printf("请输入学号:");scanf("%s",stu[i].num);fflush(stdin);printf("\n请输入姓名:");scanf("%s",stu[i].name);fflush(stdin);printf("\n请输入语文成绩:");scanf("%f",&stu[i].chinese);fflush(stdin);printf("\n请输入英语成绩:");scanf("%f",&stu[i].english);fflush(stdin);printf("\n请输入数学成绩:");scanf("%f",&stu[i].math);fflush(stdin);stu[i].a=1;stu[i].sum=stu[i].chinese+stu[i].english+stu[i].math;shuchu();printf("y返回主界面");scanf("%c",&c);if(c=='Y'||c=='y'){system("cls");mulu();}else{add();}}else if(a==2){system("cls");mulu();}else{printf("输入错误，请重新输入!");system("cls");add();}}void xiugai(){char a;system("cls");shuchu();printf("1 修改2 返回主界面");scanf("%d",&a);fflush(stdin);if(a==1){char b[10];char c;int i;int j=0;printf("请输入需要修改的人的姓名或者学号:");gets(b);fflush(stdin);puts(" ");puts(b);for(i=0;i<5;i++){if(!strcmp(stu[i].name,b)||!strcmp(stu[i].num,b)){printf("\n请输入需要修改的学号:");scanf("%s",stu[i].num);fflush(stdin);printf("\n请输入需要修改的姓名:");scanf("%s",stu[i].name);fflush(stdin);printf("\n请输入需要修改的语文成绩:");scanf("%f",&stu[i].chinese);fflush(stdin);printf("\n请输入需要修改的英语成绩:");scanf("%f",&stu[i].english);fflush(stdin);printf("\n请输入需要修改的数学成绩成绩:");scanf("%f",&stu[i].math);fflush(stdin);stu[i].sum=stu[i].chinese+stu[i].english+stu[i].math;break;}else{j++;}}if(j==5){printf("输入错误，请重新输入!");system("cls");xiugai();}system("cls");shuchu();printf("y返回主界面");scanf("%c",&c);if(c=='Y'||c=='y'){system("cls");mulu();else{xiugai();}}else if(a==2){system("cls");mulu();}else{printf("输入错误，请重新输入!");system("cls");xiugai();}}void shanchu(){char a;int j=0;system("cls");shuchu();printf("1 删除2返回主界面:");scanf("%d",&a);fflush(stdin);if(a==1){int i;char b[10];printf("请输入需要删除的人的学号或者姓名:");gets(b);fflush(stdin);for(i=0;i<5;i++){if(!strcmp(stu[i].name,b)||!strcmp(stu[i].num,b)){stu[i].a=0;printf("删除成功!");break;}elsej++;}}if(j==5){printf("输入错误，请重新输入!");shanchu();}printf("是否返回主界面:(y是)");scanf("%c",&c);if(c=='y'||c=='Y'){system("cls");mulu();}else{shanchu();}}else if(a==2){system("cls");mulu();}else{shanchu();}}void del(){char a;system("cls");shuchu();printf("1 清空 2 返回主界面");scanf("%d",&a);fflush(stdin);if(a==1){char c;printf("确定？(y确定)");scanf("%c",&c);fflush(stdin);if(a=='Y'||a=='y'){int i;for(i=0;i<5;i++){stu[i].a=0;}system("cls");del();}else{del();}}else if(a==2){system("cls");mulu();}else{printf("输入错误,请重新输入!");del();}}void chaxun(){char a;int j=0;system("cls");printf("1 查询 2 返回主界面");printf("请选择;");scanf("%d",&a);fflush(stdin);if(a==1){char b[10];char c;int i;printf("请输入需要查询的人的学号或者姓名:");gets(b);for(i=0;i<5;i++){if(!strcmp(stu[i].name,b)||!strcmp(stu[i].num,b)) {printf("\n学号:%-6s",stu[i].num);printf("\n姓名:%-6s",stu[i].name);printf("\n语文成绩:%-6.2f",stu[i].chinese);printf("\n英语成绩:%-6.2f",stu[i].english);printf("\n数学成绩:%-6.2f",stu[i].math);printf("\n总成绩:%-6.2f",stu[i].sum);break;}else{j++;}}if(j==5){printf("输入错误,请重新输入!");chaxun();}printf("是否返回主页面：(y是)");scanf("%c",&c);fflush(stdin);if(c=='y'||c=='Y'){system("cls");mulu();}else{printf("继续查找!");chaxun();}}else if(a==2){system("cls");mulu();}else{printf("输入错误,请重新输入!");chaxun();}}void paixu(){char a;char c;system("cls");shuchu();printf("1 排序2返回主界面");scanf("%d",&a);fflush(stdin);if(a==1){int i,j;int aa;struct student s;printf("1 降序排列2 升序排列");printf("请选择:");scanf("%d",&aa);fflush(stdin);for(i=0;i<5;i++){for(j=0;j<4;j++){if(aa==1){if(strcmp(stu[j].num,stu[j+1].num)<0){s=stu[j];stu[j]=stu[j+1];stu[j+1]=s;}}if(aa==2){if(strcmp(stu[j].num,stu[j+1].num)>0){s=stu[j];stu[j]=stu[j+1];stu[j+1]=s;}}}}if(aa!=1&&aa!=2){printf("输入错误，请重新输入!");system("cls");paixu();}shuchu();printf("是否返回主界面:(y是)"); scanf("%c",&c);fflush(stdin);if(c=='Y'||c=='y'){system("cls");mulu();}else{printf("继续!");paixu();}}else if(a==2){system("cls");mulu();}else{printf("输入错误，请重新输入!");paixu();}}void tongji(){system("cls");char a;printf("1 统计 2 返回主界面");scanf("%d",&a);fflush(stdin);if(a==1){char c;printf("请输入统计条件:\n");printf(" 1.参加考试的学生人数\n"); printf(" 2.语文最高分\n");printf(" 3语文及格的人数\n"); printf(" 4.语文及格率\n");printf(" 5.英语最高分\n");printf(" 6.英语及格的人数\n"); printf(" 7.英语及格率\n");printf(" 8.数学最高分\n");printf(" 9.数学及格人数\n"); printf(" 10.数学及格率\n");printf(" 11.总成绩最高\n"); printf("请选择:");scanf("%d",&c);fflush(stdin);if(c==1){int j;j=zongren();printf("参加考试的人数是：%d",j);back();}{float a;a=chinese();printf("语文最高分为:%.2f",a);back();}else if(c==3){int a;a=chr();printf("语文及格的人数为:%d",a);back();}else if(c==4){int a,b;a=zongren();b=chr();printf("语文的及格率为:%d",b/a);back();}{float a;a=english();printf("英语的最高分为%.2f:",a);back();}else if(c==6){int a;a=enr();printf("英语及格的人数为:%d",a);back();}else if(c==7){int a,b;a=zongren();b=enr();printf("英语的及格率为:%.2f",b/a);back();}{float a;a=math();printf("数学的最高分为%.2f:",a);back();}else if(c==9){int a;a=mar();printf("数学及格的人数为:%d",a);back();}else if(c==10){int a,b;a=zongren();b=enr();printf("数学的及格率为:%.2f",b/a);back();}{float a;a=zongmax();printf("总分最高为:.2f",a);back();}else{printf("输入错误，请重新输入!");system("cls");tongji();}}else if(a==2){system("cls");mulu();}else{printf("输入错误，请重新输入!");tongji();}}int zongren(){int i,a=0;for(i=0;i<5;i++){if(stu[i].a==1){a++;}}return a;}float chinese(){float max;int i;max=stu[0].chinese;for(i=0;i<5;i++){if(stu[i].a==1){if(max<stu[i].chinese){max=stu[i].chinese;}}}return max;}float english(){float max;int i;max=stu[0].english;for(i=0;i<5;i++){if(stu[i].a==1){if(max<stu[i].english){max=stu[i].english;}}}return max;}float math(){float max;int i;max=stu[0].math;for(i=0;i<5;i++){if(stu[i].a==1){if(max<stu[i].math){max=stu[i].math;}}}return max;}float zongmax(){float max;int i;for(i=0;i<5;i++){if(stu[i].a==1){if(max<stu[i].sum){max=stu[i].sum;}}}return max;}int chr(){int i,a=0;for(i=0;i<5;i++){if(stu[i].a==1){if(stu[i].chinese>=60){a++;}}}return a;}int enr(){int i,a=0;for(i=0;i<5;i++){if(stu[i].a==1){if(stu[i].english>=60){a++;}}}return a;}int mar(){int i,a=0;for(i=0;i<5;i++){if(stu[i].a==1){if(stu[i].math>=60){a++;}}}return a;}/*void fanhui2(){char c;printf("是否返回主界面:");scanf("%c",&c);if(c=='Y'||c=='y'){}}*/void shuchu(){int i;printf("学号");printf(" 姓名");printf(" 语文");printf(" 英语");printf(" 数学");printf(" 总分");puts(" ");for(i=0;i<5;i++){if(stu[i].a==1){printf("%-6s",stu[i].num);printf("%-6s",stu[i].name);printf("%-6.2f",stu[i].chinese);printf("%-6.2f",stu[i].english);printf("%-6.2f",stu[i].math);printf("%-6.2f",stu[i].sum);puts(" ");}}}void output(){char c='a';system("cls");shuchu();printf("是否返回主界面：(y是)");scanf("%c",&c);if(c=='y'||c=='Y'){system("cls");mulu();}else{printf("输入错误，请重新输入!");output();}}void back(){char d;printf("\n返回任意系统:任意键返回主界面:y键");printf("请选择:");scanf("%c",&d);fflush(stdin);if(d=='Y'||d=='y'){system("cls");mulu();}else{printf("继续");tongji();}}void finish() {exit(0); }。