[C]20130611 class Project

n定義一個結構用來放全班個人成績

uenglish: int

uprogram: int

umath: int

uaverage: float

n首先輸入一個int 代表要放多少人的成績(>=4)

nmain()用 new 配置成績結構空間

n將該結構空間傳給一function 做輸入(scanf) (Call by address)

n將該結構空間傳給一function 做輸出(Call by value/address)

n將該結構空間傳給一function 算全班各科平均(Call by address)

n最後, 不用時要delete 該結構空間

#include <stdio.h>
#include <stdlib.h>

struct score
{
	int id,english,program,math;
	float avgerage;
};

typedef struct score SCORE;

void input_data(SCORE *data, int size);
void average(SCORE *data, float *avg_eng, float *avg_pro, float *avg_mat, float *avg_avg, int size);
void printdata(SCORE *data, int size);

void main(void)
{
	int people;
	float avg_eng,avg_pro,avg_mat,avg_avg;
	SCORE *data_array;
	printf("Please enter the number of people >");
	scanf("%d",&people);
	data_array = new SCORE[people];
	input_data(data_array,people);
	average(data_array,&avg_eng,&avg_pro,&avg_mat,&avg_avg,people);
	printdata(data_array,people);
	printf("Avg\t%.2f\t%.2f\t%.2f\t%.2f\n",avg_eng,avg_pro,avg_mat,avg_avg);
	delete [] data_array;
	system("pause");
}

void input_data(SCORE *data, int size)
{
	for(int i=0;i<size;i++)
	{
		(*(data+i)).id=i+1;
		printf("Input %d-th score\n",i+1);
		printf("\tEnglish >");
		scanf("%d",&((data+i)->english));
		printf("\tProgram >");
		scanf("%d",&((data+i)->program));
		printf("\tMath >");
		scanf("%d",&((data+i)->math));
		(*(data+i)).avgerage=((*(data+i)).english+(*(data+i)).program+(*(data+i)).math)/3.0;
	}
}

void average(SCORE *data, float *avg_eng, float *avg_pro, float *avg_mat, float *avg_avg, int size)
{
	int total_eng=0,total_pro=0,total_mat=0;
	float total_avg=0;
	for(int i=0;i<size;i++)
	{
		total_eng=total_eng+(*(data+i)).english;
		total_pro=total_pro+(*(data+i)).program;
		total_mat=total_mat+(*(data+i)).math;
		total_avg=total_avg+(*(data+i)).avgerage;
	}
	*avg_eng=total_eng/(float)size;
	*avg_pro=total_pro/(float)size;
	*avg_mat=total_mat/(float)size;
	*avg_avg=total_avg/(float)size;

}

void printdata(SCORE *data, int size)
{
	printf("ID\tEnglish\tProgram\tMath\tAvgerage\n");
	for(int i=0;i<size;i++)
		printf("%d\t%d\t%d\t%d\t%.2f\n",(*(data+i)).id,(*(data+i)).english,(*(data+i)).program,(*(data+i)).math,(*(data+i)).avgerage);
}