C语言实现简易学生成绩管理系统

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

//宏定义最大学生人数
#define stu_max 30

/*进行函数的全局声明*/

//获取学生人数
int stu_num();
//显示菜单获取用户输入
char menu_tips();
//获取学生学号，及本门考试成绩
void stu_information(long num[],float score[],int n);
//计算输出课程的总分和平均分
void sum_aver(float score[],int n);
//模块功能：交换两个长整型数据
void exchange_long(long *a,long *b);
//模块功能：交换两个浮点型数据
void exchange_float(float *a,float *b);
//按成绩由高到低输出名次表
void output_score(long num[],float score[],int n);
//按学号从小到大排出成绩表
void output_num(long num[],float score[],int n);
//查询输出学生信息及考试成绩：
void query(long num[],float score[],int n);
//分数划界处理并输出
void score_pro(float score[],int n);
//直接输出对应列表
void output(long num[],float score[],int n);
//暂停清屏
void clean();

int main()
{
 int n,i;
 long num[stu_max];
 float score[stu_max];
 n=stu_num();
 while(1)
 {
 i=menu_tips();
 switch(i)
 {
 case '1':printf("1"),stu_information(num,score,n),system("cls");break;
 case '2':printf("2"),sum_aver(score,n),clean();break;
 case '3':printf("3"),output_score(num,score,n),clean();break;
 case '4':printf("4"),output_num(num,score,n),clean();break;
 case '5':printf("5"),query(num,score,n),clean();break;
 case '6':printf("6"),score_pro(score,n),clean();break;
 case '7':printf("7"),output(num,score,n),clean();break;
 case '0':printf("0"),exit(0);break;
 default:printf("Input error!\n"),clean();
 }
 }
}

/*以下为函数功能模块*/

//获取学生人数
int stu_num()
{
 int n;
 printf("Input student number(n<30):\n");
 scanf("%d",&n);
 system("cls");
 return n;
}

//显示菜单获取用户输入
char menu_tips()
{
 printf(" -----------------------------------------------------------\n");
 printf("| Management for Students' scores |\n");
 printf(" -----------------------------------------------------------\n");
 printf("| 1.Input record   |\n");
 printf("| 2.Calculate total and average score of course |\n");
 printf("| 3.Sort in descending order by score  |\n");
 printf("| 4.Sort in ascending order by numbe  |\n");
 printf("| 5.Search by number   |\n");
 printf("| 6.Statistic analysis  |\n");
 printf("| 7.List record   |\n");
 printf("| 0.Exit   |\n");
 printf(" -----------------------------------------------------------\n");
 printf("\nPlease Input your choice:\n");
 char i;
 i=getch();
 return i;
}

//获取学生学号，及本门考试成绩
void stu_information(long num[],float score[],int n)
{
 int i;
 printf("\nInput student's ID and score:\n");
 for(i=0;i<n;i++)
 scanf("%ld%f",&num[i],&score[i]);
}

//计算输出课程的总分和平均分
void sum_aver(float score[],int n)
{
 int i;
 float sum,aver;
 for(i=0,sum=0;i<n;i++)
 sum+=score[i];
 aver=sum/n;
 printf("\nsum=%.0f,aver=%.2f\n",sum,aver);
}

//模块功能：交换两个长整型数据
void exchange_long(long *a,long *b)
{
 long t;
 t=*a;
 *a=*b;
 *b=t;
}

//模块功能：交换两个浮点型数据
void exchange_float(float *a,float *b)
{
 float t;
 t=*a; *a=*b; *b=t;
}

//按成绩由高到低输出名次表
void output_score(long num[],float score[],int n)
{
 int i,j;
 for(j=n-1;j>0;j--)
 {
 for(i=0;i<j;i++)
 if(score[i]<score[i+1])
 {
 exchange_float(&score[i],&score[i+1]);
 exchange_long(&num[i],&num[i+1]);
 }
 }
 printf("\nSort in descending order by score:");
 output(num,score,n);
}

//按学号从小到大排出成绩表
void output_num(long num[],float score[],int n)
{
 int i,j;
 for(j=n-1;j>0;j--)
 {
 for(i=0;i<j;i++)
 if(num[i]>num[i+1])
 {
 exchange_float(&score[i],&score[i+1]);
 exchange_long(&num[i],&num[i+1]);
 }
 }
 output(num,score,n);
}

//查询输出学生信息及考试成绩：
void query(long num[],float score[],int n)
{
 printf("\nEnter the ID to query:\n");
 long temp;
 scanf("%ld",&temp);
 int i;
 for(i=0;i<n;i++)
 {
 if(num[i]==temp)
 {
 printf("%ld\t%.0f\n",num[i],score[i]);
 return;
 }
 }
 printf("\nNot found!\n");
}

//分数划界处理并输出
void score_pro(float score[],int n)
{
 int t[6]={0,0,0,0,0,0};
 /*前五个分别对应优秀、良好、中等、及格、不及格五个类别
 第六位存储100分的人数*/
 int i,m;
 for(i=0;i<n;i++)
 {
 if(score[i]>=90&&score[i]<100) t[0]++;
 if(score[i]>=80&&score[i]<=89) t[1]++;
 if(score[i]>=70&&score[i]<=79) t[2]++;
 if(score[i]>=60&&score[i]<=69) t[3]++;
 if(score[i]>=0 &&score[i]<=59) t[4]++;
 if(score[i]==100) t[5]++;
 }

 //遍历t数组，输出对应的数据
 for(i=0,m=9;i<6;i++)
 {
 if(i==4)
 printf("<60\t%d\t%.2f%%\n",t[4],(float)t[4]/n*100);
 if(i==5)
 printf("%d\t%d\t%.2f%%\n",100,t[5],(float)t[5]/n*100);
 if(i!=4&&i!=5)
 {
 if(i==0)
 printf("\n");
 printf("%d-%d\t%d\t%.2f%%\n",m*10,m*10+9,t[i],(float)t[i]/n*100);
 m--;
 }
 }
}

//直接输出对应列表
void output(long num[],float score[],int n)
{
 int i;
 for(i=0;i<n;i++)
 {
 if(i==0)
 printf("\n");
 printf("%ld\t%.0f\n",num[i],score[i]);
 }
}

//暂停清屏
void clean()
{
 system("pause");
 system("cls");
}