c语言课程设计学生学籍管理系统.doc

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1、#include#include#include#define stu 30int menu(void);void readchengji(long xuehao,float chengji,int n);void aversumofchengji(float xuehao,int n);void desortbychengji(long xuehao,float chengji,int n);void assortbyxuehao(long xuehao,float chengji,int n);void searchbyxuehao(long xuehao,float chengji,in

2、t n);void statisticanalysis(float chengji,int n);void printchengji(long xuehao,float chengji,int n);int main ()char itemSelected;char mima10;int n,j=0;float chengjistu;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()!=13)putchar(*);mimaj=c;j+; mimaj=0

3、; getchar();if (strcmp(mima,yaosi)=0)goto loop;else printf(密码错误，请重新输入：);printf(a);printf(a);printf(a);goto ago;loop:printf(输入学生人数nstu)printf(输入错误，请重新输入：);printf(a);printf(a);printf(a);goto shuru;while (1)/当非零的时候/itemSelected=menu();/显示菜单，并读取用户输入/switch (itemSelected)case 1: readchengji(xuehao,chengj

4、i,n);break;case 2: aversumofchengji(chengji,n);break;case 3:desortbychengji(xuehao,chengji,n);printf(n成绩降序排列：n学号t成绩n);printchengji(xuehao,chengji,n);break;case 4: assortbyxuehao(xuehao,chengji,n);printf(n学号升序排列：n学号t成绩n);printchengji(xuehao,chengji,n);break;case 5: searchbyxuehao(xuehao,chengji,n);br

5、eak;case 6: statisticanalysis(chengji,n);break;case 7: printchengji(xuehao,chengji,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学生成绩的管理n);printf(t1.学号成绩录入n);printf(t2.计算总分和平均分n); printf(t3.根据成绩降序排列n);p

6、rintf(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：);scanf(%d,&itemSelected);return itemSelected;/输入n个学生的某门课成绩/void readchengji(long xuehao,float chengji,int n)int i;printf(输入学生学号，成绩：n);for (i=0;in;i+)scanf(%ld%f,&xuehaoi,&chengjii);/计算全班总分和平均分/void

7、 aversumofchengji(float chengji,int 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 desortbychengji(long xuehao,float chengji,int n)int i,j,k;float templ1;long templ2;for (i=0;i=n-1;i+)k=i;for(j=i+1;jchengjik)k=j;if (k!=i)templ1=chengjik;chengjik=chengjii;chengjii=templ1;/交换成绩

8、/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(long xuehao,float chengji,int n)int i,j,k;float n1;long n2;for (i=0;i=n-1;i+)k=i;for(j=i+1;jn;j+)if(xuehaojxuehaok)k=j;if (k!=i)n1=chengjik;chengjik=chengjii;chengjii=n1;/交换成绩/n2=xuehaok;xuehaok=xuehaoi

9、;xuehaoi=n2;/交换学号/按学号查找学生成绩并显示查找结果/void searchbyxuehao(long xuehao,float chengji,int n)long number;int i;printf(输入你要查询的学号：);scanf(%ld,&number);for (i=0;in;i+)if(xuehaoi=number)printf(%ldt%.0fn,xuehaoi,chengjii);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 statisticanalysis(float chengji,int n)int

10、 i,total=0,t6=0,0,0,0,0,0;for (i=0;i=0&chengjii60)t0+;else if(chengjii70)t1+;else if(chengjii80)t2+;else if(chengjii90)t3+;else if(chengjii100)t4+;else if(chengjii=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)printf(60t%dt%.2f%n,ti,(float)ti/n*100);else if(i=5)printf(%dt%dt%.2f%n,(i+5)*10,ti,(float)ti/n*100);elseprintf(%d-%dt%dt%.2f%n,(i+5)*10,(i+5)*10+9,ti,(float)ti/n*100);/打印学生成绩/void printchengji(long xuehao,float chengji,int n)int i;for(i=0;in;i+)printf(%dt%.0fn,xuehaoi,chengjii);