Jinhong_Homework2/task4.cpp

#include <stdio.h>
//定义结构体
struct Student
{
	int ID;//学号 
	int classes;
	float math_grade;
	float physics_grade;
	float English_grade;
	float sum;
};

int main()
{
	struct Student information[4];
	//已有三个同学的信息
	information[0].ID=10001;information[0].classes=11;
	information[0].math_grade=99.5;
	information[0].physics_grade=88.5;
	information[0].English_grade=89.5;
	
	information[1].ID=10002;information[1].classes=12;
	information[1].math_grade=77.9;
	information[1].physics_grade=56.5;
	information[1].English_grade=87.5;
	
	information[2].ID=10003;information[2].classes=11;
	information[2].math_grade=92.5;
	information[2].physics_grade=99.0;
	information[2].English_grade=60.5;
	
	//输入新同学 
	scanf("%d%d%f%f%f",&information[3].ID,\
	&information[3].classes,&information[3].math_grade,\
	&information[3].physics_grade,&information[3].English_grade); 
	struct Student newstudent=information[3];
	//判断是否已在系统里
	if(newstudent.ID==information[0].ID||\
	newstudent.ID==information[1].ID||\
	newstudent.ID==information[2].ID)//新同学已在系统里 
	{
		for(int i=0;i<=2;i++)
		{
			if(newstudent.ID==information[i].ID)
			{
				printf("%d %d %.1f %.1f %.1f \n",\
				information[i].ID,information[i].classes,\
				information[i].math_grade,information[i].physics_grade,\
				information[i].English_grade);
			}
		}		
	}
	else//新同学不在系统里 
	{
		//排序:班级从小到大【顺便把每个人的成绩记录】 
		for(int i=0;i<=3;i++)
		{
			for(int j=0;j<=2;j++)
			{
				if(information[j].classes>information[j+1].classes)
				{
					struct Student tmp=information[j];
					information[j]=information[j+1];
					information[j+1]=tmp;
				}
			}
			information[i].sum=+information[i].math_grade+\
			information[i].physics_grade+information[i].English_grade;
		 } 
		 
		 //排序 ：对同一班级排序
		 for(int i=0;i<=3;i++)
		 {
		 	int con=0;//记录连续了几人 
		 	for(int j=1;j<=3-i;j++)
		 	{
		 		if(information[i].classes==information[i+j].classes)
		 		{con++;
				 }
				 else
				 {
				 break;
				 }
			 }
			 
			 if(con)//有人是同班同学，在此内排序 
			 {
			 	for(int m=i;m<i+con;m++)
			 	{
			 		for(int n=i;n<=i+con-1;n++)
			 		{
			 			if(information[n].sum<information[n+1].sum)
				 		{
				 			struct Student tmp=information[n];
							information[n]=information[n+1];
							information[n+1]=tmp;
						 }
					 }
				 }
			 }
			 
			 i=i+con;
		  } 
	
		for(int i=0;i<=3;i++)
		{
			printf("%d %d %.1f %.1f %.1f ",information[i].ID,\
			information[i].classes,information[i].math_grade,\
			information[i].physics_grade,information[i].English_grade);
			if(newstudent.ID==information[i].ID)
			{
				printf("inserted");
			}
			printf("\n");
		
		}
	}
}