C語言大作業(yè)學生成績管理系統(tǒng)

1、#include <stdio.h>#include <math.h>#include <string.h>#define NUM 4struct Ihb/定義結(jié)構體變量，為Ihb/int num;char namefl()1;int score4;float average;stu4,s；void saveQ/定義save函數(shù)，把錄入的學生數(shù)據(jù)輸出到磁盤list文件H4/FILE *fp;int i;if(fp=fopen(,list,；,wb,)=NULL)printf(f,can not open this filenu);return;for(i=0

2、;i<4;i+)if(fwrite(&stui,sizeof(struct Ihb), 1 ,fp)!= 1) /用 fwrile 函數(shù)將數(shù)據(jù)送到printf(nfile write errorNn,1);list 文件中/fclose(fp);)void file 1()/建立菜單1,錄入4個學生的4科成績，并算其平均分/ int i,j;/定義變量/float s=0;printf(MInput the student's number name and 4 score:nM);priitf(Mnum name suorcO score 1 scorc2 scorc3

3、iiM);for(i=0;i<4;i+)scanf(n%d%s%d%d%d%d,&stuil.num,&,&stui.score()l，&stui.scorcl, &stui.score ,&stufi.score3);for(i=0;i<4;i+)/用for循環(huán)算出每個學生的平均成績/for(j=O;j<4;j-H-)s+=stui.scorej;/各科成績累加后賦給Vstui.average=s/4.0;/計算出平均成績/s=0;save(); /調(diào)用save函數(shù)，保存數(shù)據(jù)/return;void file

4、2()/建立菜單2,打印全班學生的數(shù)據(jù)輸出到屏幕上/FILE *fp;/尋找并調(diào)用list文件數(shù)據(jù)/inti; flp=fdpenClist,；trbH);for(i*0;i<4;i+)fread(&stuiLsizeof(stmct Ihb), 1 ,fp);fclose(fp);printf(MAll the students* message:n,r);score3 averagen ”);printf(Hnum name scoreOscore 1score2for(i=0;i<4;i+)/循環(huán)輸出所有學生數(shù)據(jù)/printff'%d %s %d %d%d %

5、d %5.2fn,9stui.score09stui.scorel ,stuil.score2, stui.score3,stuil.average); return;void file3()/建立菜單3,插入一個學生數(shù)據(jù)/FILE *fp;/尋找并調(diào)用list文件數(shù)據(jù)/int fp=fopenC，listM； rbM); for(i=0;i<4;i+)fread(&stufil,sizeof(struct Ihb), 1 ,fp); fclose(fp);)printffTlcsac input a new students massagcn

6、n);scanf(M%d%s%d%d%d%dr,&s.num,&s,name,&s.score0h&s.scorell,&s.score2,&s.score31);s.average=(s.score01+s.scorc 1 l+s.score21+s.score31)/4.0;if(fp=fopen("listM,"r")=NULL ) /從 list 文件中讀數(shù)據(jù)/printf(Mcant not open the file.1');exit(O);)printf(" old students&

7、#39; original data:n");/讀取已經(jīng)存在的數(shù)據(jù)/for(i=0;fread(&stui,sizeof(struct lhb),Lfp)!=O;i+)printf(Mn%4s%4sM,stuil.num,);for(j=0;j<4;j+)printf(M%4dH,stui.scorej);prinlf(M%5.2rstui.avcragc);)fclose(fp);n=i;/將i的值賦給變量n/for(t=();stut.average>s.averagc&&t<n;t+);printf(Mn add ne

8、w student massage:nn); /In list 文件寫數(shù)據(jù)/fjp=fbpen(,listw；,w,1);for(i=0;i<t;i+)/先輸出平均分高于學生S的學生的成績/fwrile(&stui,sizeof(struct lhb),l ,fp);printf(Mn%4s%4s',stui.num,);for(j=0;j<4;j-H-)printf(',%4d",stui.scorejl);printf(H%5.2rr,stuil.average);)fwrite(&s,sizeof(struct Ih

9、b), 1 ,fp);printf(Mn%4s%4s%4d%4d%4d%4d%5.2f,s.num,,s.score()Ks.scorel ,s.score2,s.score3,s.average);/輸出學生 s 的成績/for(i=t;i<n;i+)/輸出平均分低于學生S的學生的成績/fwrite(&stuil,sizcof(struct lhb),l ,fp);printf(Mn%4s%4sM,stui.num,); for(j=0;j<4;j-H-) printf(n%4dH,stui.scorejl); printf(,%5.2f,s

10、tui.average); ) fclose(fp);/關閉文件/printf(Hnn); )void file4()/建立菜單4,按平均成績的高低輸出學生成績一覽表/int ij;/定義變量/FILE *fp;/尋找并調(diào)用list義件數(shù)據(jù)/struct Ihb t; fp=fopen(nlistH；,rbH); for(i=0;i<4;i+) frcad(&stuiLsizcof(struct lhb),l ,fp); fclose(fp); ) for(j=0；j<4;j+)/ 用冒泡排序 /for(i=3;i>j;i-)if(stuU.average<st

11、ufi.average)/比較學生的平均成績/l=stujl;stuj=stuil; Stuil=t;/比較后交換/printf(MThe average from top to buttom:nM); printf(Hnum name scoreO score 1score2 score3averagenH); for(i=0;i<4;i+)/再次循環(huán)輸出排序后的情況/printff%d %s %d%d %d%d %5.2fn,.stui.score09stui.score l,stui.score2, stui.score3,stui.averag

12、e);)void file5()/建立菜單5,統(tǒng)計平均分底于60的學生，輸出其數(shù)據(jù)/(FILE *fp;/尋找并調(diào)用list文件數(shù)據(jù)/inti; fp=fopen(,listn,HrbH);for(i=0;i<4;i+)fread(&stuil,sizeof(struct Ihb), 1 ,fp);fclose(fp);)for(i=0;i<4;i+) /用 for 循環(huán)一次/if(stui.average<60)/如果條件為真，貝J進行下列程序/printf(Mwho's average below 60 is/are:nu);printff'num

13、 name scoreO score 1 score2 score3 averagenn);printfC%d %s %d%d %d %d %5.2fnM,>stui.score09stui.scoie l,stui.score2,stuil.score3,stui.average);|return;void file6()/建立菜單6,輸出全班總平均成績，和全班各科平均成績/float v,v1=0,v2=0,v3=0,v4=0; /定義變量，并賦初始值為 0/int i,j,s=O;FILE *fp;/尋找并調(diào)用list文件數(shù)據(jù)/ fp=fope

14、n(nlisfHrbM);for(i=0;i<4;i+)fread(&stuil,sizeof(struct Ihb), 1 ,fp); fclose(fp);/各科成績循環(huán)后累加后賦給“/將S賦給V/將v的值除于4,在賦給Wfor(i=0;i<4;i+) s4-=stui.average; v=s;v=v/4.0;for(i=0;i<4;i+) vl+=stufi.score01; vl=vl/4.0;for(i=0;i<4;i+) v2+=stuil.scorel; v2=v2/4.0;for(i=0;i<4;i+) v3+=stu(il.score2

15、1; v3=v3/4.0;for(i=0;i<4;i+) v4+=stu|i.score3; v4=v4/4.0;printff' all students1 average is %5,2fn",v); /打印出全班平均成績/printf(naverage scorcfO is %5.2fn*vl);/打印出全班各科平均成績/printff'average scorcfl is %5.2fn*v2);printf(naverage scorc2 is %5.2fnM,v3);printf(Maverage score3 is %5.2fn,f,v4);)voi

16、d file7() /建立菜單7,查找學生成績情況/ int i,c,e;char ch20;FILE *巾；/尋找并調(diào)用list文件數(shù)據(jù)/fp=fopen(,list,HrbH);for(i=0;i<4;i+)fread(<festui,sizeof(struct lhb),l,fp)； fclose(fp);printf(nInput the students name to find please press lnn);printff'Input the students number to find please press 2nM);scanf(M%d"

17、,&e);/ 輸入變量/if(e=l)/判斷輸入變量e=l,如果為真，則進行下而程序/printf(nInput the student's namenH);getchar();/輸入字符型數(shù)據(jù)/scanf(M%s,&ch);for(i=0;i<4;i+)if(strcmp(ch,stu()=O) /比較判斷，如果為真，則打印出相對應成績/printf(Mnum name scoreO score 1 score2 score3 averagenH);printf(M%d%s%d%d%d%d %5.2fnlstui.num,stu(9st

18、ui.scoie09stui.scorel9stui.score2Istui.score31,stui.average);)if(e=2)/判斷輸入變量e=2,如果為真，則進行下面程序/printf(nInput the students numbcrnM);scanf(M%dn,&c);/輸入學生號數(shù)/for(i=0;i<4;i+)if(c=stui.num)/判斷，如果為真，則打印出相對應成績/printf("num name scoreO score 1 score2 score3 averageXn11);printf(H%d %s %d %d %d %d%5.

19、2fnn,stui.num9stui.naine9stui.score09stui.scorel9stui.score29stuil.score3,stui.average); )if(c!=l&&c!=2) printfCYour enter is not correct!n,f);return:)main()/定義主函數(shù)/int m;loop:/goto語句返回時的起始處/printfCn) /在屏幕上輸出菜單表/printf(n*MUNE *11,.printfCPress 1input student's massage and save them to a l

20、ist.nH);printfCPress 2print all of the students' massage on the screen.nM);printff,press 3input add a new sludent's massage.nn);printff1Press 4print student's average from top to buttom on the screen.5");printfCPress 5print who's average below 60 on the screen.nM);printff*Press

21、6print all and each course's average of class on the screen.5")；printfCPress 7enter naine/number find out one of the students* massage.nM);printfC Press 0 Exit this system.nn);printff* Please Input Your Choice First *nr1);scanf('%d",&m);/輸入所選菜單/if(m=l) /判斷條件，如果為真，則調(diào)用菜單I函數(shù)/ file 1();printfCDo you want to continue this servise Y/N?n");getchar(); /輸入字符型數(shù)據(jù)/ if(getchar()=y)/判斷輸入數(shù)據(jù)是否為真，如果為真，則執(zhí)行goto語句