简单成绩管理系统（没有存盘）

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <iostream>
#include <algorithm>
using namespace std;
#define N 300
struct student{
  float  no;//学号
  char name[20];
  int english;
  int meth;
  int  charater;
  float ave;
}stu[N]={0};
bool flag=true;
void input();
void show_all();
void delete_stu( );
void search();//输入姓名查找成绩
void over();
void insertion();
int main()
{
 while(flag)
 {
  int n;
  printf("************************************************\n");
  printf("*  menu :                                                    *\n");
  printf("*  1,input student's name....                      *\n");
  printf("*  2,show all students                                *\n");
  printf("*  3,delete one people name                     *\n");
  printf("*  4,search                                                *\n");
  printf("*  5,over                                                    *\n");
  printf("*  6,insertion                                             *\n");
  printf("************************************************\n");

  scanf("%d",&n);
  switch(n)
  {
      case 1:input();break;
      case 2:show_all();break;
      case 3:delete_stu();break;
      case 4:search();break;
      case 5:over();break;
      case 6:insertion();break;
      default:printf("misinput! try again!\n");

  }
  }

  return 0;
}

/*初始化结构体*/
void input()
{
  printf("input you want to ,if you want to over ,you can input '0' \n");
  int i=1;
  while(getchar()!='0')
  {
 printf(" %d studens you have get\n",i-1);
  printf("no:");
  scanf("%f",&stu[i].no);
  printf("name:");
  scanf("%s",&stu[i].name);
  printf("English:");
  scanf("%d",&stu[i].english);
  printf("math:");
  scanf("%d",&stu[i].meth);
  printf("charater:");
  scanf("%d",&stu[i].charater);getchar();
  printf("successful ");
   i++;
  }
  i--;
  while(i)
  {
    stu[i].ave=(stu[i].english+stu[i].meth+stu[i].charater)/3.0;//计算平均值
    i--;
  }
}





void  show_all()//显示所有学生的信息
{
  printf("all students:\n");
  int i=1;
  while(stu[i].ave!=0)
  {
      printf("no:%.f,name:%s\n",stu[i].no,stu[i].name);
      printf("english:%d, math:%d, charater:%d, ave:%f\n",stu[i].english,stu[i].meth,stu[i].charater,stu[i].ave);
      i++;
  }
}
void delete_stu( )
{
  int n;
  printf("please input serial numbel\n");
  scanf("%d",&n);
  while(stu[n].ave!=0)
  {
      stu[n]=stu[n+1];
      n++;
  }
  printf("delete successful\n");
  }

void search( )
{
  float n;
 printf("please input no you want to find");//输入学号查找对应的序列号
 scanf("%f",&n);
 int i=1;
 while(stu[i].no!=n)
  {

     i++;
  }
 printf("sserial number:%d\n",i);
 printf("no:%f,name:%s\n",stu[i].no,stu[i].name);
 printf("english:%d,math:%d,charater:%d,ave:%f\n",stu[i].english,stu[i].meth,stu[i].charater,stu[i].ave);

}


void over()
{

    flag=false;
    printf("thank you !!!!");
}

void insertion()
{
 int i=1;
 while(stu[i].ave!=0){
    i++;
 }
 printf("i=%d\n",i);
  printf("no:");
  scanf("%f",&stu[i].no);
  printf("name:");
  scanf("%s",&stu[i].name);
  printf("English:");
  scanf("%d",&stu[i].english);
  printf("math:");
  scanf("%d",&stu[i].meth);
  printf("charater:");
  scanf("%d",&stu[i].charater);getchar();
  stu[i].ave=(stu[i].english+stu[i].meth+stu[i].charater)/3.0;
  printf("successful \n");
}