C语言写成绩系统(只用到指针以及之前的内容)
(注:不能用到结构体)C语言写一个成绩管理系统，模板在末尾张照片，一共有五个功能，具体内容请看照片
/**
* @file dome34.c
* @author your name (you@domain.com)
* @brief
* @version 0.1
* @date 2022-11-24
*
* @copyright Copyright (c) 2022
* 简易版班级成绩管理系统
*/
#include<stdio.h>
#define Max 50//最大人数为50个人，如果想更大，就改变这个值
int number =4;//记录学生信息的人数；
//显示学生成绩的函数
void show(long int *num,char (*name)[10],char (*class)[10],float (*score)[3]){
printf("\tNo.\t\tName");
int i=0;
int j=0;
for(i=0;i<3;i++){
if(i==2){printf("\t\t%s",class[i]);}
else{printf("\t%s",class[i]);}
}
printf("\n");
for(i=0;i<number;i++){
if(num[i]==0)
{
continue;
}//学号为0，相当于没有该学生信息
else{
printf("\t%ld",num[i]);
printf("\t%s",name[i]);
for(j=0;j<3;j++)
{
printf("\t%.1f\t",score[i][j]);
}
printf("\n");
}
}
}
//搜索学生id是否存在,并返回下标
int find(long int id,long int *num){
int i,index;
for(i=0;i<number;i++){
if(id==num[i]){
index=i;//记录下标位置
break;
}
else{continue;}
}
if(i==number)
{return -1;}
else
{return index;}
}
//根据学生id搜索分数
void query(long int id,long int *num,char (*class)[10],float (*score)[3]){
int i,j,index;
index=find(id,num);
if(index==-1){printf("没有该学生信息！\n");}
else//找到就输出学生信息
{
printf("你的成绩如下：\n");
for(i=0;i<3;i++){
if(i==2){printf("\t\t%s\n",class[i]);}
else{printf("\t%s",class[i]);}
}
for(j=0;j<3;j++)
{
printf("\t%.1f\t",score[index][j]);
}
printf("\n");
}
}
void update(long int id,long int *num,char (*name)[10],float (*score)[3])
{
int i,j,index,a;
index=find(id,num);
if(index==-1){printf("没有该学生信息！\n");}
else//找到就输出学生信息
{
printf("---------------\n");
printf("1、修改ID号\n");
printf("2、修改姓名\n");
printf("3、修改成绩\n");
scanf("%d",&a);
switch (a)
{
case 1:
printf("请输入新的学号：");
scanf("%s",&num[index]);
printf("修改成功！\n");
break;
case 2:
printf("请输入新的姓名：");
scanf("%s",&name[index]);
printf("修改成功！\n");
break;
case 3:
printf("1、修改Computer\n");
printf("2、修改Math\n");
printf("3、修改English\n");
int b;
scanf("%d",&b);
switch (b)
{
case 1:
printf("请输入新成绩：");
scanf("%f",&score[index][0]);
printf("修改成功！\n");
break;
case 2:
printf("请输入新成绩：");
scanf("%f",&score[index][1]);
printf("修改成功！\n");
break;
case 3:
printf("请输入新成绩：");
scanf("%f",&score[index][2]);
printf("修改成功！\n");
break;
default:
break;
}
break;
default:
break;
}
}
}
//删除学生信息
void reMove(long int id,long int *num,char (*name)[10],float (*score)[3]){
int i,j,index;
index=find(id,num);
if(index==-1){printf("没有该学生信息！\n");}
else//找到就删除
{
num[index]=0;
name[index][10]='\0';
for(i=0;i<3;i++){
score[index][j]=0.0;
}
printf("删除成功！\n");
}
}
//删除学生信息
void add(long int *num,char (*name)[10],float (*score)[3]){
printf("请输入学号：");
scanf("%ld",&num[number]);
printf("请输入姓名：");
scanf("%s",&name[number]);
printf("请输入Computer成绩:");
scanf("%f",&score[number][0]);
printf("请输入Math成绩:");
scanf("%f",&score[number][1]);
printf("请输入English成绩:");
scanf("%f",&score[number][2]);
printf("添加成功！\n");
number++;
}
int main(){
long int num[Max]={20210101,20210102,20210103,20210104};
char name[Max][10]={"Stu_01","Stu_02","Stu_03","Stu_04"};
char class[3][10]={"Computer","Math","English"};
float score[Max][3]={{60.5,97.0,90.5},{88.5,67.5,88.1},{72.3,75.0,92.0},{66.8,86.0,45.5}};
int i;
char ch;
long int id;
int TuiChu=1;
printf("-------------------------------------\n");
printf("d、显示学生成绩信息\n");
printf("q、查找学生成绩信息\n");
printf("u、更新学生成绩信息\n");
printf("r、删除学生成绩信息\n");
printf("a、增加学生成绩信息\n");
printf("p、退出系统\n");
for(;;){
scanf("%c",&ch);
switch(ch){
case 'd':
show(num,name,class,score);
break;
case 'q':
printf("请输入你的学号：");
scanf("%ld",&id);
query(id,num,class,score);
break;
case 'u':
printf("请输入你的学号：");
scanf("%ld",&id);
update(id,num,name,score);
break;
case 'r':
printf("请输入你的学号：");
scanf("%ld",&id);
reMove(id,num,name,score);
break;
case 'a':
add(num,name,score);
break;
case 'p':
TuiChu=0;
break;
}
if(TuiChu==0){break;}
}
return 0;
}
#include<stdio.h>
#include<windows.h>
#define Max 25
#define obj_num 5
struct Stu
{
char Name[25]; //姓名
int Number; //学号
int Language_score;//语文成绩
int Math_score; //数学成绩
int English_score; //英语成绩
int PE_score; //体育成绩
int C_score; //C语言成绩
int Sum_score; //总成绩
};
void input(struct Stu Class[],int j)
{
printf("输入第%d位同学姓名:",j+1);
scanf("%s",Class[j].Name);
getchar();
printf("输入第%d位同学学号:",j+1);
scanf("%d",&Class[j].Number);
printf("输入第%d位同学语文成绩:",j+1);
scanf("%d",&Class[j].Language_score);
printf("输入第%d位同学数学成绩:",j+1);
scanf("%d",&Class[j].Math_score);
printf("输入第%d位同学英语成绩:",j+1);
scanf("%d",&Class[j].English_score);
printf("输入第%d位同学体育成绩:",j+1);
scanf("%d",&Class[j].PE_score);
printf("输入第%d位同学C语言成绩:",j+1);
scanf("%d",&Class[j].C_score);
Class[j].Sum_score=Class[j].Language_score+Class[j].Math_score+Class[j].English_score+Class[j].PE_score+Class[j].C_score;
}
void output(struct Stu Class[],int n)
{
printf("---------------------------------------------\n");
printf("姓名 学号 语文 数学 英语 体育 C语言 总分");
printf("\n");
int j;
for(j=0; j<n; j++)
{
printf("%5s",Class[j].Name);
printf("%5d",Class[j].Number);
printf("%6d",Class[j].Language_score);
printf("%6d",Class[j].Math_score);
printf("%6d",Class[j].English_score);
printf("%6d",Class[j].PE_score);
printf("%6d",Class[j].C_score);
printf("%7d",Class[j].Sum_score);
printf("\n");
}
printf("---------------------------------------------\n");
}
void outputOne(struct Stu Class[],int j)
{
printf("姓名 学号 语文 数学 英语 体育 C语言 总分");
printf("\n");
printf("%5s",Class[j].Name);
printf("%5d",Class[j].Number);
printf("%6d",Class[j].Language_score);
printf("%6d",Class[j].Math_score);
printf("%6d",Class[j].English_score);
printf("%6d",Class[j].PE_score);
printf("%6d",Class[j].C_score);
printf("%7d",Class[j].Sum_score);
printf("\n");
}
void Sort(struct Stu Class[],int n)
{
int j,k;
struct Stu t;
for(j=0; j<n-1; j++)
{
for(k=0; k<n-j-1; k++)
{
if(Class[k].Sum_score<Class[k+1].Sum_score)
{
t=Class[k];
Class[k]=Class[k+1];
Class[k+1]=t;
}
}
}
}
int search(int number,int n,struct Stu Class[])
{
int i,p=0;
for(i=0; i<n; i++)
{
if(Class[i].Number==number)
{
p=i;
return p;
}
}
return -1;
}
void modify(int number,int n,struct Stu Class[])
{
int index=search(number,n,Class);
if(index==-1)
{
printf("找不到该学号\n");
}
else
{
printf("学号%d的学生是第%d位\n",number,index+1);
input(Class,index);
printf("修改成功\n");
output(Class,n);
}
}
void del(int number,int n,struct Stu Class[])
{
int index=search(number,n,Class);
if(index==-1)
{
printf("找不到该学号\n");
}
else
{
printf("学号%d的学生是第%d位\n",number,index);
int i;
for(i=index; i<n-1; i++)
{
Class[i]= Class[i+1];
}
printf("删除成功\n");
output(Class,n-1);
}
}
double calave(int n,struct Stu Class[],double ave[])
{
int Language_score_sum=0;
int Math_score_sum=0;
int English_score_sum=0;
int PE_score_sum=0;
int C_score_sum=0;
for(int i=0; i<n; i++)
{
Language_score_sum+=Class[i].Language_score;
Math_score_sum+=Class[i].Math_score;
English_score_sum+=Class[i].English_score;
PE_score_sum+=Class[i].PE_score;
C_score_sum+=Class[i].C_score;
}
ave[0]=(double)Language_score_sum/n;
ave[1]=(double)Math_score_sum/n;
ave[2]=(double)English_score_sum/n;
ave[3]=(double)PE_score_sum/n;
ave[4]=(double)C_score_sum/n;
}
void save(int n,struct Stu Class[])
{
FILE *fp;
fp = fopen("score_data.txt","w");
if(fp == NULL)
{
printf("error!");
return;
}
else
{
for(int j=0; j<n; j++)
{
fprintf(fp,"%s %d %d %d %d %d %d %d\n",Class[j].Name,Class[j].Number,Class[j].Language_score,Class[j].Math_score,Class[j].English_score,Class[j].PE_score,Class[j].C_score,Class[j].Sum_score);
}
printf("文件写入成功\n");
}
fclose(fp);
}
int read(int n,struct Stu Class[])
{
FILE *fp;
fp = fopen("score_data.txt","r");
int count=0;
if(fp == NULL)
{
printf("error!");
return 0;
}
else
{
for(int j=0; j<n; j++)
{
int flag=fscanf(fp,"%s %d %d %d %d %d %d %d\n",Class[j].Name,&Class[j].Number,&Class[j].Language_score,&Class[j].Math_score,&Class[j].English_score,&Class[j].PE_score,&Class[j].C_score,&Class[j].Sum_score);
if(flag!=-1) count++;
}
printf("文件读取成功\n");
}
fclose(fp);
return count;
}
void menu(struct Stu Class[])
{
int n=0,count;
int option=1;
while(option<=9&&option>=1)
{
printf("------------------------\n");
printf("------学生成绩管理------\n");
printf("------1.输入成绩 ------\n");
printf("------2.输出成绩 ------\n");
printf("------3.按总成绩排序----\n");
printf("------4.按学号查询成绩--\n");
printf("------5.修改信息 ------\n");
printf("------6.删除学生 ------\n");
printf("------7.计算各科平均分--\n");
printf("------8.文件读入 ------\n");
printf("------9.保存至文件------\n");
printf("------other.退出 ------\n");
printf("------------------------\n");
printf("输入选项：");
scanf("%d",&option);
switch(option)
{
case 1:
{
system("cls");
printf("输入学生的个数(不大于%d):",Max-n);
scanf("%d",&count);
while(count--)
{
input(Class,n++);
}
output(Class,n);
break;
}
case 2:
{
system("cls");
output(Class,n);
break;
}
case 3:
{
system("cls");
Sort(Class,n);
output(Class,n);
break;
}
case 4:
{
system("cls");
int number;
printf("输入要查找的学号：");
scanf("%d",&number);
int index=search(number,n,Class);
if(index==-1)
{
printf("查找失败\n");
}
else
{
printf("查找成功\n");
outputOne(Class,index);
}
break;
}
case 5:
{
system("cls");
output(Class,n);
int number;
printf("输入要修改成绩的学生对应的学号：");
scanf("%d",&number);
modify(number,n,Class);
output(Class,n);
break;
}
case 6:
{
system("cls");
output(Class,n);
int number;
printf("输入要删除的学号：");
scanf("%d",&number);
del(number,n,Class);
n--;
system("cls");
output(Class,n);
break;
}
case 7:
{
system("cls");
output(Class,n);
double ave[obj_num];
calave(n,Class,ave);
char str[]="平均分";
printf("\n");
printf("%5s",str);
printf(" ");
printf("%5.2lf",ave[0]);
printf("%6.2lf",ave[1]);
printf("%6.2lf",ave[2]);
printf("%6.2lf",ave[3]);
printf("%6.2lf",ave[4]);
printf("\n");
break;
}
case 8:
{
system("cls");
n-=n;
n+=read(Max,Class);
break;
}
case 9:
{
system("cls");
save(n,Class);
break;
}
default :
{
break;
}
}
}
}
int main()
{
struct Stu Class [Max];
menu(Class);
return 0;
}