Jinhong_Homework2/task3.cpp

#include <stdio.h>
//定义结构体
struct Student
{
	int ID;//学号 
	float math_grade;
	float physics_grade;
	float English_grade;
	float sum;
	float average; 
};
void Show_The_Main_interface()
{
	//显示主界面 
	for(int i=1;i<=30;i++)
	{
		printf(" ");
	}
	printf("1.Input\n");
	for(int i=1;i<=30;i++)
	{
		printf(" ");
	}
	printf("2.Output\n");
	for(int i=1;i<=30;i++)
	{
		printf(" ");
	}
	printf("3.Order\n");
	for(int i=1;i<=30;i++)
	{
		printf(" ");
	}
	printf("4.Quit\n");
}

void Output_Prompts(char choice)
{
	//输出提示信息 
	if(choice=='i')
	{
		printf("Please input info of the three students:\n");
	}
	else if(choice=='o')
	{
		printf("You are trying to Output info\n");
	}
	else if(choice=='m')
	{
		printf("You are trying to Make things ordered\n");
	}
	else if(choice=='q')
	{
		printf("You are about to Quit\n");
	}
	else
	{
		printf("Wrong input\n");
	}
}
int main()
{	
	//显示主界面
	Show_The_Main_interface();
	//用户输入 
	char choice;
	scanf("%c",&choice);
	//输出提示信息 
	Output_Prompts(choice); 
	
	//输入学生信息 
	struct Student information[3];
	for(int i=0;i<3;i++)
	{
		scanf("%d%f%f%f",&information[i].ID,&information[i].math_grade,\
		&information[i].physics_grade,&information[i].English_grade);
		information[i].sum=information[i].math_grade+information[i].physics_grade\
		+information[i].English_grade;
	 	information[i].average=information[i].sum/3.0;
	 } 
	 
	 //排序 
	for(int i=0;i<3;i++)
	{
		for(int j=0;j<3-i-1;j++)
		{
			if(information[j].sum>information[j+1].sum)
			{
				//此处我们直接交换结构体 
				struct Student tmp;
				tmp=information[j];
				information[j]=information[j+1];
				information[j+1]= tmp;
			}
		}
	 } 
	 
	 //按要求输出
	for(int i=0;i<3;i++)
	{
		printf("%d,%.1f,%.1f\n",information[i].ID,\
		information[i].sum,information[i].average);
	 }  
}