xjxt/xjxt4.cpp

#include <stdio.h>
typedef struct{
	int Id;
	int mclass;
	float a,b,c;
	float total;
}Student;
void sort(Student *person,int len)
{
	for(int i=0;i<len-1;i++)
	{
		int k=i;
		for(int j=i;j<len-1;j++)
		{
			if(person[k].mclass>person[j].mclass||(person[k].mclass==person[j].mclass&&person[k].total<person[j].total))
			{
				k=j;
			}
			if(k!=i)
			{
				Student temp=person[i];
				person[i]=person[k];
				person[k]=temp;
			}
		}
	}
}
int newId,newClass;
float grade1,grade2,grade3;
void print(Student *person)
{
	for(int i=0;i<4;i++)
	{
		printf("%d %d %.lf %.lf %.lf",person[i].Id,person[i].mclass,person[i].a,person[i].b,person[i].c);
	    if(person[i].Id==newId)
	    {
	    	printf(" inserted");
		}
		printf("\n");
	}
}
int main()
{
	Student students[4]=
	{
        {10001,11,99.5,88.5,89.5,99.5+88.5+89.5},
        {10002,12,77.9,56.5,87.5,77.9+56.5+87.5},
        {10003,11,92.5,99.0,60.5,92.5+99.0+60.5},
        {10000,0,0.0,0.0,0.0,0.0}
    };
    scanf("%d %d %f %f %f",&newId,&newClass,&grade1,&grade2,&grade3);
    for(int i=0;i<3;i++)
    {
    	if(students[i].Id==newId)
    	{
    		printf("The student id %d already exists.\n",newId);
    		return 0;
		}
	}
	students[3].Id=newId;
    students[3].mclass=newClass;
    students[3].a=grade1;
    students[3].b=grade2;
    students[3].c=grade3;
    students[3].total=grade1+grade2+grade3;
    sort(students,4);
    print(students);
    return 0;
}