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标题: 基于visual Studio2013解决C语言竞赛题之0901文件读写 [打印本页]

作者: 大灰狼 时间: 2014-9-9 08:43
标题: 基于visual Studio2013解决C语言竞赛题之0901文件读写
题目

解决代码及点评

<pre code_snippet_id="91880" snippet_file_name="blog_20131202_1_2646179" class="cpp" name="code"></pre><pre code_snippet_id="91880" snippet_file_name="blog_20131202_1_2646179" class="cpp" name="code"><pre code_snippet_id="91880" snippet_file_name="blog_20131202_1_2646179" class="cpp" name="code"><pre code_snippet_id="91880" snippet_file_name="blog_20131202_1_2646179" class="cpp" name="code"><pre code_snippet_id="91880" snippet_file_name="blog_20131202_1_2646179" class="cpp" name="code">/*
1. 将10个整数写入数据文件f3.dat中,
再读出f3.dat中的数据并求其和。
*/
#include <stdio.h>
#include <stdlib.h>
const int N = 10;
void writeFile()
{
int a[N];
//随机产生10个数,存入数组a[N]
for (int i = 0;i < N; i++)
{
a = rand() % 100;
}
FILE *fp = NULL;
fopen_s(&fp, "f3.dat","w");
if (fp)
{
for (int i = 0;i < N; i++)
{
fprintf(fp,"a[%d]=%d ",i,a);
}
fclose(fp);
}
else
{
printf("open file failed!");
//exit(0);
}
}
int readFile()
{
int a[N];
FILE *fp = NULL;
int sum = 0;
fopen_s(&fp, "f3.dat","r");
if (fp)
{
for (int i = 0;i < N; i++)
{
if (!feof(fp))
{
fscanf_s(fp,"a[%d]=%d ",&i,&a);
sum += a;
}
}
fclose(fp);
}
else
{
printf("open file failed!");
}
return sum;
}
void main()
{
writeFile();
int sum = readFile();
printf("sum = %d\n",sum);
system("pause");
}</pre><br><br></pre></pre></pre>