c语言程序设计实习报告程序

#include"stdio.h"/*定义学生结构体 */structStudent{charID[20];charName[20];floatMark1;/*计算机*/floatMark2;/*英语*/floatMark3; /*数学*/floatZongfen;/*总分*/floatAverage;};/*平均分*//*声明学生数组及学生数量 */structStudentstudents[2000];intnum=0;/*求总分*/float Zong(structStudentstu){return(stu.Mark1+stu.Mark2+stu.Mark3);}/*求平均值*/floatAvg(structStudentstu){return(stu.Mark1+stu.Mark2+stu.Mark3)/3;}/*通过学号返回数组下标 */intStudent_SearchByIndex(charid[]){inti;for(i=0;i<num;i++){if(strcmp(students[i].ID,id)==0){returni;}}return-1;}/*通过姓名返回数组下标 */intStudent_SearchByName(charname[]){inti;for(i=0;i<num;i++){if(strcmp(students[i].Name,name)==0){returni;}}return-1;}/*通过学号返回数组下标 */intStudent_SearchID(charid[]){inti;for(i=0;i<num;i++){if(strcmp(students[i].ID,id)==0){returni;}}return-1;}/*显示单条学生记录 */voidStudent_DisplaySingle(intindex){printf("%10s%10s%8s%8s%8s%8s%10s\n","学号","姓名","计算机","英语","数学","总分","平均成绩");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);}/*插入学生信息 */voidStudent_Insert(){while(1){printf("请输入学号:");scanf("%s",&students[num].ID);getchar();printf("请输入姓名:");scanf("%s",&students[num].Name);getchar();printf("请输入计算机成绩:");scanf("%f",&students[num].Mark1);getchar();printf("请输入英语成绩:");scanf("%f",&students[num].Mark2);getchar();printf("请输入数学成绩:");scanf("%f",&students[num].Mark3);getchar();students[num].Average=Avg(students[num]);students[num].Zongfen=Zong(students[num]);num++;printf("是否继续?(y/n)");if(getchar()=='n'){break;}}}voidexit();/*修改学生信息 */voidStudent_Modify(){floatmark1,mark2,mark3;while(1){charid[20];intindex;printf("请输入要修改的学生的学号 :");scanf("%s",&id);getchar();index=Student_SearchByIndex(id);if(index==-1){printf("学生不存在!\n");}else{printf("你要修改的学生信息为 :\n");Student_DisplaySingle(index);printf("-- 请输入新值--\n");printf("请输入学号:");scanf("%s",&students[index].ID);getchar();printf("请输入姓名:");scanf("%s",&students[index].Name);getchar();printf("请输入成绩:");scanf("%f",&students[index].Mark1);getchar();printf("请输入成绩:");scanf("%f",&students[index].Mark2);getchar();printf("请输入成绩:");scanf("%f",&students[index].Mark3);getchar();students[index].Zongfen=Zong(students[index]);students[index].Average=Avg(students[index]); }printf("是否继续?(y/n)");if(getchar()=='n'){break;}}}/*删除学生信息 */voidStudent_Delete(){inti;while(1){charid[20];intindex;printf("请输入要删除的学生的学号 :");scanf("%s",&id);getchar();index=Student_SearchByIndex(id);if(index==-1){printf("学生不存在!\n");}else{printf("你要删除的学生信息为 :\n");Student_DisplaySingle(index);printf("是否真的要删除 ?(y/n)");if(getchar()=='y'){for(i=index;i<num-1;i++){students[i]=students[i+1];}num--;}getchar();}printf("是否继续?(y/n)");if(getchar()=='n'){break;}}}/*按姓名或学号查询 */voidStudent_Select(){intsel;printf("1-------------------- 按姓名查询\n");printf("2-------------------- 按学号查询\n");scanf("%d",&sel);if(sel==2){while(1){charid[20];intindex;printf("请输入要查询的学生的学号 :");scanf("%s",&id);getchar();index=Student_SearchID(id);if(index==-1){printf("学生不存在!\n");}else{printf("你要查询的学生信息为 :\n");Student_DisplaySingle(index);}printf("是否继续?(y/n)");if(getchar()=='n'){break;}}}elseif(sel==1){while(1){charname[20];intindex;printf("请输入要查询的学生的姓名 :");scanf("%s",&name);getchar();index=Student_SearchByName(name);if(index==-1){printf("学生不存在!\n");}else{printf("你要查询的学生信息为 :\n");Student_DisplaySingle(index);}printf("是否继续?(y/n)");if(getchar()=='n'){break;}}}elseprintf("信息错误!\n");}/*排序*/voidStudent_SortByAverage(){inta,sel;printf("1--------------------printf("2--------------------printf("3--------------------printf("4--------------------printf("5--------------------printf("6--------------------printf("7--------------------

按学号排序\n");按姓名排序\n");按计算机排序\n");按英语排序\n");按数学排序\n");按总分排序\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("信息错误!\n");}/*显示学生信息 */voidStudent_Display(){inti;printf("%10s%10s%8s%8s%8s%8s%10s\n","学号","姓名","计算机","英语","数学","总分","平均成绩"); 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);}}/*将学生信息从文件读出 */voidIO_ReadInfo(){FILE*fp;inti;if((fp=fopen("Database.txt","rb"))==NULL){printf("不能打开文件!\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);}/*将学生信息写入文件 */voidIO_WriteInfo(){FILE*fp;inti;if((fp=fopen("Database.txt","wb"))==NULL){printf("不能打开文件!\n");return;}if(fwrite(&num,sizeof(int),1,fp)!=1){printf("写入文件错误!\n");}for(i=0;i<num;i++){if(fwrite(&students[i],sizeof(struct Student),1,fp)!=1){printf("写入文件错误!\n");}}fclose(fp);}/*统计不同分数段的学生 */voidStudent_TJ(){while(1){inta,sel;floatm,n;printf("1--------------------

按计算机统计不同分数段的学生

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

按英语统计不同分数段的学生

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

按数学统计不同分数段的学生

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

按总分统计不同分数段的学生

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

按平均分统计不同分数段的学生

\n");scanf("%d",&sel);printf("输入所需查询的分数段 [m,n]");scanf("%f%f",&m,&n);printf("%10s%10s%8s%8s%8s%8s%10s\n","学号","姓名","计算机","英语","数学","总分","平均成绩");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("信息错误!\n");printf("是否继续?(y/n)");a=getchar();if(ge