#include"stdio.h"/*定義學生結構體 */structStudent{charID[20];charName[20];floatMark1;/*計算機*/floatMark2;/*英語*/floatMark3; /*數學*/floatZongfen;/*總分*/floatAverage;};/*平均分*//*聲明學生數組及學生數量 */structStudentstudents[2000];intnum=0;/*求總分*/float Zong(structStudentstu){return(stu.Mark1+stu.Mark2+stu.Mark3);}/*求平均值*/floatAvg(structStudentstu){return(stu.Mark1+stu.Mark2+stu.Mark3)/3;}/*通過學號返回數組下標 */intStudent_SearchByIndex(charid[]){inti;for(i=0;i<num;i++){if(strcmp(students[i].ID,id)==0){returni;}}return-1;}/*通過姓名返回數組下標 */intStudent_SearchByName(charname[]){inti;for(i=0;i<num;i++){if(strcmp(students[i].Name,name)==0){returni;}}return-1;}/*通過學號返回數組下標 */intStudent_SearchID(charid[]){inti;for(i=0;i<num;i++){if(strcmp(students[i].ID,id)==0){returni;}}return-1;}/*顯示單條學生記錄 */voidStudent_DisplaySingle(intindex){printf("%10s%10s%8s%8s%8s%8s%10s\n","學號","姓名","計算機","英語","數學","總分","平均成績");printf("-------------------------------------------------------------\n");rintf("%10s%10s%8.0f%8.0f%8.0f%8.0f%10.2f\n",students[index].ID,students[index].Name,students[index].Mark1,students[index].Mark2,students[index].Mark3,students[index].Zongfen,students[index].Average);}voidStudent_DisplaySingle1(intindex){printf("-------------------------------------------------------------\n");rintf("%10s%10s%8.0f%8.0f%8.0f%8.0f%10.2f\n",students[index].ID,students[index].Name,students[index].Mark1,students[index].Mark2,students[index].Mark3,students[index].Zongfen,students[index].Average);}/*插入學生信息 */voidStudent_Insert(){while(1){printf("請輸入學號:");scanf("%s",&students[num].ID);getchar();printf("請輸入姓名:");scanf("%s",&students[num].Name);getchar();printf("請輸入計算機成績:");scanf("%f",&students[num].Mark1);getchar();printf("請輸入英語成績:");scanf("%f",&students[num].Mark2);getchar();printf("請輸入數學成績:");scanf("%f",&students[num].Mark3);getchar();students[num].Average=Avg(students[num]);students[num].Zongfen=Zong(students[num]);num++;printf("是否繼續?(y/n)");if(getchar()=='n'){break;}}}voidexit();/*修改學生信息 */voidStudent_Modify(){floatmark1,mark2,mark3;while(1){charid[20];intindex;printf("請輸入要修改的學生的學號 :");scanf("%s",&id);getchar();index=Student_SearchByIndex(id);if(index==-1){printf("學生不存在!\n");}else{printf("你要修改的學生信息為 :\n");Student_DisplaySingle(index);printf("-- 請輸入新值--\n");printf("請輸入學號:");scanf("%s",&students[index].ID);getchar();printf("請輸入姓名:");scanf("%s",&students[index].Name);getchar();printf("請輸入成績:");scanf("%f",&students[index].Mark1);getchar();printf("請輸入成績:");scanf("%f",&students[index].Mark2);getchar();printf("請輸入成績:");scanf("%f",&students[index].Mark3);getchar();students[index].Zongfen=Zong(students[index]);students[index].Average=Avg(students[index]); }printf("是否繼續?(y/n)");if(getchar()=='n'){break;}}}/*刪除學生信息 */voidStudent_Delete(){inti;while(1){charid[20];intindex;printf("請輸入要刪除的學生的學號 :");scanf("%s",&id);getchar();index=Student_SearchByIndex(id);if(index==-1){printf("學生不存在!\n");}else{printf("你要刪除的學生信息為 :\n");Student_DisplaySingle(index);printf("是否真的要刪除 ?(y/n)");if(getchar()=='y'){for(i=index;i<num-1;i++){students[i]=students[i+1];}num--;}getchar();}printf("是否繼續?(y/n)");if(getchar()=='n'){break;}}}/*按姓名或學號查詢 */voidStudent_Select(){intsel;printf("1-------------------- 按姓名查詢\n");printf("2-------------------- 按學號查詢\n");scanf("%d",&sel);if(sel==2){while(1){charid[20];intindex;printf("請輸入要查詢的學生的學號 :");scanf("%s",&id);getchar();index=Student_SearchID(id);if(index==-1){printf("學生不存在!\n");}else{printf("你要查詢的學生信息為 :\n");Student_DisplaySingle(index);}printf("是否繼續?(y/n)");if(getchar()=='n'){break;}}}elseif(sel==1){while(1){charname[20];intindex;printf("請輸入要查詢的學生的姓名 :");scanf("%s",&name);getchar();index=Student_SearchByName(name);if(index==-1){printf("學生不存在!\n");}else{printf("你要查詢的學生信息為 :\n");Student_DisplaySingle(index);}printf("是否繼續?(y/n)");if(getchar()=='n'){break;}}}elseprintf("信息錯誤!\n");}/*排序*/voidStudent_SortByAverage(){inta,sel;printf("1--------------------printf("2--------------------printf("3--------------------printf("4--------------------printf("5--------------------printf("6--------------------printf("7--------------------

按學號排序\n");按姓名排序\n");按計算機排序\n");按英語排序\n");按數學排序\n");按總分排序\n");按平均分排序\n");scanf("%d",&sel);if(sel==1){inti,j;structStudenttmp;for(i=0;i<num;i++){for(j=1;j<num-i;j++){if(strcmp(students[j-1].ID,students[j].ID)>0){tmp=students[j-1];students[j-1]=students[j];students[j]=tmp;}}}}elseif(sel==2){inti,j;structStudenttmp;for(i=0;i<num;i++){for(j=1;j<num-i;j++){if(strcmp(students[j-1].Name,students[j].Name)>0){tmp=students[j-1];students[j-1]=students[j];students[j]=tmp;}}}}elseif(sel==3){inti,j;structStudenttmp;for(i=0;i<num;i++){for(j=1;j<num-i;j++){if(students[j-1].Mark1>students[j].Mark1){tmp=students[j-1];students[j-1]=students[j];students[j]=tmp;}}}}elseif(sel==4){inti,j;structStudenttmp;for(i=0;i<num;i++){for(j=1;j<num-i;j++){if(students[j-1].Mark2>students[j].Mark2){tmp=students[j-1];students[j-1]=students[j];students[j]=tmp;}}}}elseif(sel==5){inti,j;structStudenttmp;for(i=0;i<num;i++){for(j=1;j<num-i;j++){if(students[j-1].Mark3>students[j].Mark3){tmp=students[j-1];students[j-1]=students[j];students[j]=tmp;}}}}elseif(sel==6){inti,j;structStudenttmp;for(i=0;i<num;i++){for(j=1;j<num-i;j++){if(students[j-1].Zongfen>students[j].Zongfen){tmp=students[j-1];students[j-1]=students[j];students[j]=tmp;}}}}elseif(sel==7){inti,j;structStudenttmp;for(i=0;i<num;i++){for(j=1;j<num-i;j++){if(students[j-1].Average>students[j].Average){tmp=students[j-1];students[j-1]=students[j];students[j]=tmp;}}}}elseprintf("信息錯誤!\n");}/*顯示學生信息 */voidStudent_Display(){inti;printf("%10s%10s%8s%8s%8s%8s%10s\n","學號","姓名","計算機","英語","數學","總分","平均成績"); printf("-------------------------------------------------------------\n");for(i=0;i<num;i++){rintf("%10s%10s%8.0f%8.0f%8.0f%8.0f%10.2f\n",students[i].ID,students[i].Name,students[i].Mark1,students[i].Mark2,students[i].Mark3,students[i].Zongfen,students[i].Average);}}/*將學生信息從文件讀出 */voidIO_ReadInfo(){FILE*fp;inti;if((fp=fopen("Database.txt","rb"))==NULL){printf("不能打開文件!\n");return;}if(fread(&num,sizeof(int),1,fp)!=1){num=-1;}else{for(i=0;i<num;i++){fread(&students[i],sizeof(struct Student),1,fp);}}fclose(fp);}/*將學生信息寫入文件 */voidIO_WriteInfo(){FILE*fp;inti;if((fp=fopen("Database.txt","wb"))==NULL){printf("不能打開文件!\n");return;}if(fwrite(&num,sizeof(int),1,fp)!=1){printf("寫入文件錯誤!\n");}for(i=0;i<num;i++){if(fwrite(&students[i],sizeof(struct Student),1,fp)!=1){printf("寫入文件錯誤!\n");}}fclose(fp);}/*統計不同分數段的學生 */voidStudent_TJ(){while(1){inta,sel;floatm,n;printf("1--------------------

按計算機統計不同分數段的學生

\n");printf("2--------------------

按英語統計不同分數段的學生

\n");printf("3--------------------

按數學統計不同分數段的學生

\n");printf("4--------------------

按總分統計不同分數段的學生

\n");printf("5--------------------

按平均分統計不同分數段的學生

\n");scanf("%d",&sel);printf("輸入所需查詢的分數段 [m,n]");scanf("%f%f",&m,&n);printf("%10s%10s%8s%8s%8s%8s%10s\n","學號","姓名","計算機","英語","數學","總分","平均成績");if(sel==1){intj;for(j=0;j<=num;j++){if(students[j].Mark1>=m&&students[j].Mark1<=n)Student_DisplaySingle1(j);}}elseif(sel==2){intj;for(j=0;j<=num;j++){if(students[j].Mark2>=m&&students[j].Mark2<=n)Student_DisplaySingle1(j);}}elseif(sel==3){intj;for(j=0;j<=num;j++){if(students[j].Mark3>=m&&students[j].Mark3<=n)Student_DisplaySingle1(j);}}elseif(sel==4){intj;for(j=0;j<=num;j++){if(students[j].Zongfen>=m&&students[j].Zongfen<=n)Student_DisplaySingle1(j);}}elseif(sel==5){intj;for(j=0;j<=num;j++){if(students[j].Average>=m&&students[j].Average<=n)Student_DisplaySingle1(j);}}elseprintf("信息錯誤!\n");printf("是否繼續?(y/n)");a=getchar();if(ge