从键盘输入5个学生基本信息(学号\姓名\3门课程的成绩\平均成绩)并保存在磁盘文件中,

[Janear]

麻烦高手解决一哈,先谢了

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

#define N 2

#define M 2

struct student
{
int ID;

char name[20];

float score[M];

float ave;

}stu[N];

void main()
{
FILE *fp=NULL;

int i,j;

char ch;

float sum=0.0;

fp=fopen("stud.txt","wb");

if(fp==NULL)
{
printf("Cannot open this file\n");

exit (0);
}


for(i=0;i<N;i++)
{
printf("Please Enter %dth student's Name ID Scores of %dTh is :\n",i+1,M);

scanf("%s %d ",stu[i].name,&stu[i].ID);



for(j=0;j<M;j++)
{
scanf("%f",&stu[i].score[j]);

sum+=stu[i].score[j];

}

ch=getchar();

stu[i].ave=sum/M;/**/

fwrite(&stu[i],sizeof(struct student),1,fp);

}

fclose(fp);



fp=fopen("stud.txt","rb");

if(fp==NULL)
{
printf("Cannot open this file\n");

exit (0);
}

for(i=0;i<N;i++)
{

fread(&stu[i],sizeof(struct student),1,fp);

printf("%-10d %-10s ",stu[i].ID,stu[i].name);

for(j=0;j<M;j++)
{
printf("%6.2f",stu[i].score[j]);
}

printf("%6.2f\n",stu[i].ave);
}

fclose(fp);

}

[xianyuxiaoqiang]

汗，发这么多遍做甚……

[cattycat]

你是在散分吗，我给你改的可以运行啊，我运行的时候就没有问题啊。

[Janear]

因为调试了好多遍，都不行，所以才多发了几遍吖

[jernymy]

顶

[wjling2009]

这么不喜欢写吗....你可以去试着调试下啊..

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

#define  N  5 //5名同学

#define  M  3 //改为3，三个课程 

struct  student 
{ 
int ID;  

char  name[20]; 

float score[M]; 

float ave; 

}stu[N]; 

void main() 
{ 
FILE *fp=NULL; 

int i,j; 

char ch; 

float sum=0.0; 
  
fp=fopen("stud.txt","wb"); 

if(fp==NULL) 
{ 
  printf("Cannot open this file\n"); 

  exit  (0); 
} 

printf("Enter like this:a1 1 78 76 87 \n");//这样的提示是需要的
for(i=0;i <N;i++) 
{ 
	printf("Please Enter  %dth  student's Name  ID  Scores of %dTh is :\n",i+1,M); 

  scanf("%s %d ",stu[i].name,&stu[i].ID); 

  
  
  for(j=0;j <M;j++) 
  { 
    scanf("%f",&stu[i].score[j]); 

    sum+=stu[i].score[j]; 

  } 
  
  ch=getchar(); 

  stu[i].ave=sum/M;/**/ 
  sum=0;	//此处总和应该清零，以计算下一个同学的平均成绩
  
  fwrite(&stu[i],sizeof(struct student),1,fp); 

} 

fclose(fp); 


fp=fopen("stud.txt","rb"); 

if(fp==NULL) 
{ 
  printf("Cannot open this file\n"); 

  exit  (0); 
} 

for(i=0;i <N;i++) 
{ 

    fread(&stu[i],sizeof(struct student),1,fp); 
  
  printf("%-10d %-10s ",stu[i].ID,stu[i].name); 
  
  for(j=0;j <M;j++) 
  { 
  printf("%6.2f",stu[i].score[j]); 
  } 

  printf("%6.2f\n",stu[i].ave); 
} 

fclose(fp); 

} 

[flyyyri]

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

#define  N  2 
#define  M  2 

struct student 
{ 
	int ID;  
	char  name[20]; 
	float score[M]; 
	float ave; 
}stu[N]; 

void main() 
{ 
	FILE *fp=NULL; 
	int i,j; 
	char ch; 
	float sum=0.0;   
	fp=fopen("stud.txt","wb"); 
	if(fp==NULL) 
	{ 
		printf("Cannot open this file\n"); 
		exit  (0); 
	} 

	for(i=0;i<N;i++) 
	{ 
		sum=0.0;  //加上这句就ok
		printf("Please Enter %dth student's Name ID Scores of %dTh is :\n",i+1,M); 
		scanf("%s %d", stu[i].name, &stu[i].ID);  //从键盘输入名字和ID时中间用空格分开；

		for(j=0;j<M;j++) 
		{ 
			scanf("%f",&stu[i].score[j]); 
			sum+=stu[i].score[j]; 
		} 
		ch=getchar();        
		stu[i].ave=sum/M;         
		fwrite(&stu[i],sizeof(struct student),1,fp); 
	} 
	fclose(fp); 

	fp=fopen("stud.txt","rb"); 
	if(fp==NULL) 
	{ 
		printf("Cannot open this file\n"); 
		exit  (0); 
	} 

	for(i=0;i<N;i++) 
	{ 
		fread(&stu[i],sizeof(struct student),1,fp); 
		printf("%-10d %-10s ",stu[i].ID,stu[i].name); 
		for(j=0;j<M;j++) 
		{ 
			printf("%6.2f",stu[i].score[j]); 
		} 
		printf("%6.2f\n",stu[i].ave); 
	} 
	fclose(fp); 
} 

[Janear]

很感谢各位,我犯了一个低级的错误,就是在计算完第一个学生成绩后sum没清零