C语言—学生成绩管理系统

#include<stdio.h> #include<stdlib.h> #include<string.h> #include<malloc.h> struct Student{ int num; char name[10]; int score[3]; double ave; }; void input(struct Student *student,int number); void show(struct Student *student,int number); void search(struct Student *student,int number); void swap(struct Student *student,int number); void add(struct Student *student,int n1); int main(){ printf("*****************学生成绩管理系统*****************\n"); printf("* *\n"); printf("* 1、成 绩 录 入 *\n"); printf("* 2、成 绩 显 示 *\n"); printf("* 3、成 绩 查 询 *\n"); printf("* 4、成 绩 排 序 *\n"); printf("* 5、成 绩 添 加 *\n"); printf("* 6、保 存 退 出 *\n"); printf("* *\n"); printf("**************************************************\n"); int n=0,i,j,number; FILE *fp,*fpd; while(n!=6) { printf("请输入你需要进行的操作:"); scanf("%d",&n); if(n==1)//成绩记录入模块 { printf("请输入您要录入学生的个数:"); scanf("%d",&number); struct Student *student=(struct Student *)malloc(sizeof(struct Student)*number);//分配录入内存 if(((fp=fopen("data.txt","wb"))==NULL)||((fpd=fopen("number.txt","wb"))==NULL)) { printf("error"); exit(0); } input(student,number); if(fwrite(&number,sizeof(int ),1,fpd)!=1) printf("error"); for(j=0;j<number;j++) if(fwrite(&student[j],sizeof(struct Student),1,fp)!=1) printf("error"); fclose(fp); fclose(fpd); free(student); } if(n==2)//成绩显示模块 { if(((fp=fopen("data.txt","rb"))==NULL)||((fpd=fopen("number.txt","rb"))==NULL)) { printf("error"); exit(0); } fread(&number,sizeof(int),1,fpd); struct Student *student1=(struct Student *)malloc(sizeof(struct Student)*number);//分配显示内存 for(i=0;i<number;i++) fread(&student1[i],sizeof(struct Student),1,fp); show(student1,number); printf("\n"); fclose(fp); fclose(fpd); free(student1); } if(n==3)//成绩查询模块 { if(((fp=fopen("data.txt","rb"))==NULL)||((fpd=fopen("number.txt","rb"))==NULL)) { printf("error"); exit(0); } fread(&number,sizeof(int),1,fpd); struct Student *student2=(struct Student *)malloc(sizeof(struct Student)*number);//分配查询内存 for(i=0;i<number;i++) fread(&student2[i],sizeof(struct Student),1,fp); search(student2,number); fclose(fp); fclose(fpd); free(student2); } if(n==4)//成绩排序模块 { if(((fp=fopen("data.txt","rb"))==NULL)||((fpd=fopen("number.txt","rb"))==NULL)) { printf("error"); exit(0); } fread(&number,sizeof(int),1,fpd); struct Student *student3=(struct Student *)malloc(sizeof(struct Student)*number);//分配排序内存 for(i=0;i<number;i++) fread(&student3[i],sizeof(struct Student),1,fp); swap(student3,number); fclose(fp); fclose(fpd); free(student3); } if(n==5)//成绩添加模块 { int n1,numberx; printf("请输入您要添加的学生的个数:"); scanf("%d",&n1); if(((fp=fopen("data.txt","a"))==NULL)||((fpd=fopen("number.txt","w+"))==NULL)) { printf("error"); exit(0); } fread(&number,sizeof(int),1,fpd); numberx=number+n1; struct Student *student4=(struct Student *)malloc(sizeof(struct Student)*n1);//分配排序内存 add(student4,n1); if(fwrite(&numberx,sizeof(int),1,fpd)!=1) printf("error"); for(j=0;j<n1;j++) if(fwrite(&student4[j],sizeof(struct Student),1,fp)!=1) printf("error"); fclose(fp); fclose(fpd); free(student4); } printf("**************************************************\n"); } printf("保存成功......\n"); exit(0); return 0; } void input(struct Student *student,int number)//成绩录入函数 { int i,z=0; printf("请输入学号、姓名、英语成绩、C语言成绩以及高数成绩:\n"); for(i=0;i<number;i++) { scanf("%d %s %d %d %d",&student[i].num,student[i].name,&student[i].score[0],&student[i].score[1],&student[i].score[2]); student[i].ave=(student[i].score[0]+student[i].score[1]+student[i].score[2])/3.0; } } void show(struct Student *student,int number)//成绩显示函数 { int i=0; printf("学号 姓名 英语成绩 C语言成绩 高数成绩 平均成绩\n"); for(i=0;i<number;i++) printf(" %-d%8s%7d%11d%10d%12.2lf\n",student[i].num,student[i].name,student[i].score[0],student[i].score[1],student[i].score[2],student[i].ave); } void search(struct Student *student,int number)//成绩查询函数 { int sid,i; printf("请输入您要查询的学生的学号:"); scanf("%d",&sid); printf("学号 姓名 英语成绩 C语言成绩 高数成绩 平均成绩\n"); for(i=0;i<number;i++) { if(sid==student[i].num) printf(" %-d%8s%7d%11d%10d%12.2lf\n",student[i].num,student[i].name,student[i].score[0],student[i].score[1],student[i].score[2],student[i].ave); } } void swap(struct Student *student,int number)//成绩排序函数 { int i,j; struct Student temp; for(i=1;i<number;i++) { for(j=0;j<number-i;j++) { if(student[i].ave>student[i-1].ave) { temp=student[i]; student[i]=student[i-1]; student[i-1]=temp; } } } printf("学号 姓名 英语成绩 C语言成绩 高数成绩 平均成绩\n"); for(i=0;i<number;i++) printf(" %-d%8s%7d%11d%10d%12.2lf\n",student[i].num,student[i].name,student[i].score[0],student[i].score[1],student[i].score[2],student[i].ave); } void add(struct Student *student,int n1)//成绩添加函数 { int i; printf("请输入要添加的学生的学号、姓名、英语成绩、C语言成绩以及高数成绩:\n"); for(i=0;i<n1;i++) { scanf("%d %s %d %d %d",&student[i].num,student[i].name,&student[i].score[0],&student[i].score[1],&student[i].score[2]); student[i].ave=(student[i].score[0]+student[i].score[1]+student[i].score[2])/3.0; } }