wangjiejob1.cpp

来自「一个数据库的小例子 实现了查询修改更新闪出各种操作 并能对基本表进行删除」· C++ 代码 · 共 57 行

//上机试题－－成绩文件
#include <stdio.h>
#include <stdlib.h>
#define num  5;
struct stud_type
{
	int no;
	char name[20];
	float score;
};
 
 main()
{
	struct stud_type student [5];
	int i,j,m=0,n=0;
	float total=0,average,percentage1,percentage2;
	FILE *fp;
	if((fp = fopen("d:\\project1\wangjiejob1.txt","r"))==NULL)
	{
		printf("the file is error");
		fgetch();
		exit(0);
	}
	
	
	else
	{   
		for(j =0; j<num; j++)
		fscanf(fp,"%d    %s     %f" ,&student[i].no,ststudent[i].name,&student[i].score);    
		printf("\n");

	} 
	
	for(j =0; j<num; j++)
	{
		total += student[j].score ;
		if(student[j++].score >= 90)m++;
	    if(student[j++].score < 60)m++;
    average =(float)(total/num);
	printf("the average score is: %f \n", average); 

	
    

	percentage1 =(float) (m/num);
	printf("优秀率是：\n", percentage1 );

	
	
	
	percentage2 =(float)(n/num);
    printf("不及格率是：\n", percentage2 );


	fclose(fp);
}