文件操作和异常处理问题

[cyy219]

/*编写一个文件打不开的异常处理程序，如果能打开文件，
则按行读出该文件内容到控制台，否则抛出异常。*/

#include<iostream.h>
#include <stdio.h>
#include <fstream.h>
#define size 10

void readfile() throw(char *)
{
char *p = "data.txt";
FILE *fp;
int i = 0;
int a[size];
if (!(fp = fopen("data.txt", "a")))
{
throw("´ò¿ªÊ§°Ü");
}
while(fscanf(fp,"%d",a[i]==size))
{
if (i>=size)
{
break;
}
cout<<a[i]<<endl;
i++;
}
fclose(fp);
}

void main()
{
try
{
readfile();
}
catch(char *Ers)
{
cerr<<Ers<<endl;
}
}

data.txt文件内容为： 87 94 134 864 64 548 489 15 21 317

为什么运行结果输出的是十个 “-858993460”呢？

[dubiousway]

fscanf(fp,"%d",a[i]==size)

这个地方？

[bluejays]

if (!(fp = fopen("data.txt", "r")))
while(fscanf(fp,"%d",&a[i])>0)

[走好每一步]

#include<iostream.h>
#include <stdio.h>
#include <fstream.h>
#define size 10

void readfile() throw(char *)
{
char *p = "data.txt";
FILE *fp;
int i = 0;
int a[size] = {0};

if (!(fp = fopen("data.txt", "r")))
{
throw("′ò?a꧰ü");
}

while(fscanf(fp, "%d", &a[i]))
{
if (i>=size)
{
break;
}
cout<<a[i]<<endl;
i++;
}

fclose(fp);
}

void main()
{
try
{
readfile();
}
catch(char *Ers)
{
cerr<<Ers<<endl;
}
}

[走好每一步]

#include<iostream.h>
#include <stdio.h>
#include <fstream.h>
#define size 10

void readfile() throw(char *)
{
	char *p = "data.txt";
	FILE *fp;
	int i = 0;
	int a[size] = {0};

	if (!(fp = fopen("data.txt", "r")))
	{
		throw("′ò?a꧰ü");
	}

	while(fscanf(fp, "%d", &a[i]))
	{
		if (i>=size)
		{
			break;
		}
		cout<<a[i]<<endl;
		i++;
	}

	fclose(fp);  
}

void main()
{
	try
	{
		readfile();
	}
	catch(char *Ers)
	{
		cerr<<Ers<<endl;
	}
}