1、#in clude<stdio.h>#in clude<stdlib.h>#in clude<stri ng.h>#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,floa

2、t che ngji,i nt n); void searchbyxuehao(l ong xuehao,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;

3、printf("ttt學生成績管理系統n");printf("請輸入密碼：”)；ago:j=0;while(c=getch()!=13)putchar('*');mimaj=c;j+;mimaj='0' getchar();if (strcmp(mima,yaosi)=0)goto loop;elseprintf("密碼錯誤，請重新輸入：");prin tf("a");prin tf("a");prin tf("a");goto ago;loop:pri

4、ntf("輸入學生人數 n<%d :",stu);shuru:scan f("%d",&n);if(n> stu)printf("輸入錯誤，請重新輸入：");prin tf("a");prin tf("a");prin tf("a");goto shuru;while (1)/當非零的時候/itemSelected=me nu();顯示菜單，并讀取用戶輸入/switch (itemSelected)case 1: readche ngji(xuehao,c

5、he ngji ,n);break;case 2: aversumofche ngji(che ngji, n);break;case 3:desortbyche ngji(xuehao,che ngji, n);printf("n成績降序排列：n學號t成績n”)；prin tche ngji(xuehao,che ngji, n);break;case 4: assortbyxuehao(xuehao,che ngji, n);printf("n學號升序排列：n學號t成績n”)；prin tche ngji(xuehao,che ngji, n);break;case 5

6、: 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("程序結束！");break;default:printf("輸入錯誤！ ”)；break;return 0;/函數功能：顯示菜單并獲得用戶鍵盤輸入的選項/int menu （void）int itemSelected;printf（"n

7、學生成績的管理n"）;printf（"t1.學號成績錄入n"）;prin tf（"t2 計算總分和平均分n"）;printf（"t3.根據成績降序排列n"）;printf（"t4.按照學號升序排列n"）;printf（"t5.按學號查詢 n"）;printf（"t6.統計分析 n"）;printf（"t7.列表記錄 n"）;printf（"t0.退出 n"）; printf（"請輸入你的選擇："）;scan

8、 f（"%d", &itemSelected）; return itemSelected;輸入n個學生的某門課成績/void readche ngji（lo ng xuehao,float che ngji,i nt n）int i;printf（"輸入學生學號，成績：n"）;for （i=0;i <n ;i+）scan f（"%ld%f", &xuehaoi,&chen gjii）;計算全班總分和平均分 void aversumofche ngji（float che ngji,i nt n）int i

9、;float sum=0;for（i=0;i< n;i+）sum=sum+che ngjii;printf（"總分數=%.0f，平均分=%.2fn",sum,n>0?sum/n:0）;/按選擇法將數組chengji的元素按從高到低排序/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+)k=i;for(j=i+1;j< n;j+)if(che ngjij>che ngjik)

10、k=j;if (k!=i)tempi仁che ngjik;che ngjik=che ngjii;chengjii=templ1; 交換成績 / templ2=xuehaok;xuehaok=xuehaoi;xuehaoi=templ2; 交換學號 /按選擇法將數組xuehao的元素值按從低到高排序/ 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+)if(xuehaoj<xue

11、haok)k=j;if (k!=i)n 1=che ngjik;che ngjik=che ngjii;chengjii=n1; 交換成績 /n 2=xuehaok;xuehaok=xuehaoi;xuehaoi=n2; 交換學號 /按學號查找學生成績并顯示查找結果/void searchbyxuehao(l ong xuehao,float che ngji,i nt n) long nu mber;int i;printf("輸入你要查詢的學號：”)；scan f("%ld", &n umber);for (i=0;i <n ;i+)if(xue

12、haoi=nu mber)prin tf("%ldt%.0fn",xuehaoi,che ngjii); return;printf("n 未查詢到！ n");/統計各分數段的學生人數及所占的百分比/void statistica nalysis(float che ngji,i nt n)int i,total=0,t6=0,0,0,0,0,0;for (i=0;i <n ;i+)if(che ngjii>=0&&che ngjii<60)t0+;else if(che ngjii<70)t1+;else if(

13、che ngjii<80)t2+;else if(che ngjii<90)t3+；else if(che ngjii<100)t4+;else if(che ngjii=100)t5+;for(i=0;i<=5;i+)total=total+ti;if(total!=n)printf("成績輸入不在正確的范圍”)；return;printf("n分數段t人數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 t