//综合实践五：学生多门成绩存储与处理设计

#include<stdio.h>

#define N 5  

main(){

   float score[N],max,s,x,ave;

   int i,j,k,n,num;

   while(1){

printf("******学生成绩管理系统********\n");

printf("***  1 --------- 成绩输入  **\n" );

printf("***  2 ----------成绩插入  **\n ");

printf("***  3  ---------成绩查询  **\n ");

printf("***  4  ---------成绩排序  **\n ");

    printf("***  5  ---------成绩删除  **\n ");

    printf("***  6  ---------成绩输出  **\n ");

printf("***  0  ---------退出      **\n ");

printf("*****************************\n");

printf("请输入你的选择：");

scanf("%d",&n);

switch(n){

   case 1:printf("输入成绩个数(<%d)：",N);

          scanf("%d",&num);

          for(i=0;i<num;i++){

             scanf("%f",&score[i]);

  }

      break;

   case 2:printf("输入要插入的成绩：");

              scanf("%f",&x);

              i=num-1;

              while(i>=0&&score[i]<x){

                  score[i+1]=score[i];

                  i--;

  }

              score[i+1]=x;

              num++;

              break;

   case 3:printf("输入要查询的成绩：");

              scanf("%f",&x);

              for(i=0;i<N;i++){

                  if(x==score[i])

                     break;

              }

              if(i<N)

                  printf("序号：%d\n",i+1);

              else printf("成绩不存在！\n");

      break;

   case 4:for(i=0;i<num-1;i++){

                k=i;

                for(j=i+1;j<num;j++){

                   if(score[k]>score[j])

                     k=j;

}

                x=score[i];

                score[i]=score[k];

                score[k]=x;

  }

      break;

   case 5:printf("输入要删除的成绩：");

              scanf("%f",&x);

              i=0;

              while(i<num&&score[i]!=x){

                  i++;

  }

  if(i<num){

  while(i<num-1){

  score[i]=score[i+1];

  i++;

  }

  num--;

  }

  else printf("成绩不存在！\n");

              break;

       case 6:printf("成绩输出：");

          for(i=0;i<num;i++){

             printf("%5.1f",score[i]);

  }

          printf("\n");

      break;

   case 0:return;

   default:printf("选择错误！\n");

}}}