基于visual Studio2013解决C语言竞赛题之0902文件查找







题目

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解决代码及点评

/*
2.	一个以％5d格式存放20个整数的文件f4.dat，顺序号定为0～19。
	输入某一顺序号之后，读出相应的数据并显示在屏幕上。
*/
#include <stdio.h>
#include <stdlib.h>
void writeFille9_2()
{
	FILE *fp = NULL;
	fopen_s(&fp, "f4.dat","w");
	if (fp)
	{
		for (int i = 0; i < 20; i++)
		{
			fprintf(fp,"%5d",i);
		}
		fclose(fp);
	}
	else
	{
		printf("open file failed!");
	}
}
int * readFille9_2(int index)
{
	int * result = NULL;
	int a;
	FILE *fp = NULL;
	fopen_s(&fp, "f4.dat","r");
	if (fp)
	{
		fseek(fp,index * 5,SEEK_CUR);
		if (fscanf_s(fp,"%5d",&a) == EOF)
		{
			return NULL;
		}
		result = &a;
		fclose(fp);
	}
	else
	{
		printf("open file failed!");
	}
	return result;
}
void main()
{
	writeFille9_2();
	int index;
	printf("input a index:\n");
	scanf_s("%d",&index);
	int *result = readFille9_2(index);
	result == NULL ? printf("文件上没有%d号的数据。\n",index) : printf("读取结果：%d\n",*result);
	system("pause");
}

代码编译以及运行

由于资源上传太多，资源频道经常被锁定无法上传资源，同学们可以打开VS2013自己创建工程，步骤如下：

1）新建工程

2）选择工程

3）创建完工程如下图：

4）增加文件，右键点击项目

5）在弹出菜单里做以下选择

6）添加文件

7）拷贝代码与运行

程序运行结果

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" alt="" />





代码下载

http://download.csdn.net/detail/yincheng01/6694119

解压密码：c.itcast.cn