c语言课程设计学生学籍管理系统

1、#in clude#in clude#in clude#defi ne stu 30int menu (void);void readche ngji(lo ng xuehao,float che ngji,i nt n);void aversumofche ngji(float xuehao,i nt n);void desortbyche ngji(l ong xuehao,float che ngji,i nt n);void assortbyxuehao(l ong xuehao,float che ngji,i nt n);void searchbyxuehao(l ong xueh

2、ao,float che ngji,i nt n);void statistica nalysis(float che ngji,i nt n);void prin tche ngji(l ong xuehao,float che ngji,i nt n);int mai n ()char itemSelected;char mima10;int n ,j=0;float che ngjistu;long xuehaostu;char yaosi=6251;char c;printf(ttt学生成绩管理系统n);printf(请输入密码：”)；ago:j=0;while(c=getch()!=

3、13)putchar(*);mimaj=c;j+;mimaj=0;getchar();if (strcmp(mima,yaosi)=0)goto loop;elseprintf(密码错误，请重新输入：);prin tf(a);prin tf(a);prin tf(a);goto ago;loop:printf(输入学生人数 n stu)printf(输入错误，请重新输入：);prin tf(a);prin tf(a);prin tf(a);goto shuru;while (1)/当非零的时候/itemSelected=me nu();显示菜单，并读取用户输入/switch (itemSele

4、cted)case 1: readche ngji(xuehao,che ngji ,n);break;case 2: aversumofche ngji(che ngji, n);break;case 3:desortbyche ngji(xuehao,che ngji, n);printf(n成绩降序排列：n学号t成绩n”)；prin tche ngji(xuehao,che ngji, n);break;case 4: assortbyxuehao(xuehao,che ngji, n);printf(n学号升序排列：n学号t成绩n”)；prin tche ngji(xuehao,che

5、 ngji, n);break;case 5: searchbyxuehao(xuehao,che ngji, n);break;case 6: statistica nalysis(che ngji, n);break;case 7: prin tche ngji(xuehao,che ngji, n);break;case 0: exit(0);printf(程序结束！);break;default:printf(输入错误！ ”)；break;return 0;/函数功能：显示菜单并获得用户键盘输入的选项/int menu （void）int itemSelected;printf（n学生

6、成绩的管理n）;printf（t1.学号成绩录入n）;prin tf（t2 计算总分和平均分n）;printf（t3.根据成绩降序排列n）;printf（t4.按照学号升序排列n）;printf（t5.按学号查询 n）;printf（t6.统计分析 n）;printf（t7.列表记录 n）;printf（t0.退出 n）; printf（请输入你的选择：）;scan f（%d, &itemSelected）; return itemSelected;输入n个学生的某门课成绩/void readche ngji（lo ng xuehao,float che ngji,i nt n）int i;p

7、rintf（输入学生学号，成绩：n）;for （i=0;i n ;i+）scan f（%ld%f, &xuehaoi,&chen gjii）;计算全班总分和平均分 void aversumofche ngji（float che ngji,i nt n）int i;float sum=0;for（i=0;i0?sum/n:0）;/按选择法将数组chengji的元素按从高到低排序/void desortbyche ngji(l ong xuehao,float che ngji,i nt n)int i,j,k;float templ1;long templ2;for (i=0;i=n _1;i

8、+)k=i;for(j=i+1;jche ngjik)k=j;if (k!=i)tempi仁che ngjik;che ngjik=che ngjii;chengjii=templ1; 交换成绩 / templ2=xuehaok;xuehaok=xuehaoi;xuehaoi=templ2; 交换学号 /按选择法将数组xuehao的元素值按从低到高排序/ void assortbyxuehao(l ong xuehao,float che ngji,i nt n) int i,j,k;float n1;long n2;for (i=0;i=n _1;i+)k=i;for(j=i+1;j n;j

9、+)if(xuehaojxuehaok)k=j;if (k!=i)n 1=che ngjik;che ngjik=che ngjii;chengjii=n1; 交换成绩 /n 2=xuehaok;xuehaok=xuehaoi;xuehaoi=n2; 交换学号 /按学号查找学生成绩并显示查找结果/void searchbyxuehao(l ong xuehao,float che ngji,i nt n) long nu mber;int i;printf(输入你要查询的学号：”)；scan f(%ld, &n umber);for (i=0;i n ;i+)if(xuehaoi=nu mbe

10、r)prin tf(%ldt%.0fn,xuehaoi,che ngjii); return;printf(n 未查询到！ n);/统计各分数段的学生人数及所占的百分比/void statistica nalysis(float che ngji,i nt n)int i,total=0,t6=0,0,0,0,0,0;for (i=0;i =0&che ngjii60)t0+;else if(che ngjii70)t1+;else if(che ngjii80)t2+;else if(che ngjii90)t3+；else if(che ngjii100)t4+;else if(che ngjii=100)t5+;for(i=0;i=5;i+)total=total+ti;if(total!=n)printf(成绩输入不在正确的范围”)；return;printf(n分数段t人数t百分比n);for(i=0;i=5;i+)if(i=0)prin tf(60t%dt%.2f%n,ti,(float)ti/n*100);else if(i=5)prin tf(%dt%dt%.2f%n,(i+5)*10, ti ,(float)ti/n*100);elseprin tf(%d-%dt%d