讀取文件並實現了把裏面的數字讀取出來並加以求平均數
#include<stdio.h>
#include<string.h>
using namespace std;
int a1[1000009];
int r = 0;
int sum = 0,flag = 0;
void swi(char s)
{
if(s == '\254')
{
if(!flag)
{
a1[r] = sum;
r++;
}
flag = 0;
sum = 0;
}
else if(s == '\243')
{
}
else if(s == '\n')
{
if(!flag)
{
a1[r] = sum;
r++;
}
flag = 0;
sum = 0;
}
else if(s == '0')
{
sum = sum*10+(s-'0');
}
else if(s == '1')
{
sum = sum*10+(s-'0');
}
else if(s == '2')
{
sum = sum*10+(s-'0');
}
else if(s == '3')
{
sum = sum*10+(s-'0');
}
else if(s == '4')
{
sum = sum*10+(s-'0');
}
else if(s == '5')
{
sum = sum*10+(s-'0');
}
else if(s == '6')
{
sum = sum*10+(s-'0');
}
else if(s == '7')
{
sum = sum*10+(s-'0');
}
else if(s == '8')
{
sum = sum*10+(s-'0');
}
else if(s == '9')
{
sum = sum*10+(s-'0');
}
else
{
flag = 1;
}
} //狀態機
int main()
{
char a;
/*
fstream openfile("678.txt");// 文件位置及名稱，記得雙斜槓，文件名稱是1.txt，其它的是路徑
if (!openfile)
{
cout << "open failed!" << endl;
exit(1);
}
do {
openfile.get(a);
if (openfile.eof())
break;
//cout << a; // 存到 a，以每個字符存
swi(a);
} while (!openfile.eof());*/
FILE *fp=NULL;
fp = fopen("678.txt", "a+");//讀寫打開一個文本文件，允許讀，或在文件末尾追加數據
if (fp == NULL) {
printf("文件打開失敗！");
}
char ch = fgetc(fp);//判斷文件是否爲空
if (ch == EOF) {
printf("文件爲空！\n");
}
rewind(fp);//將指針重置到第一行
while (!feof(fp)) {//檢測文件一共多少行
ch = fgetc(fp);
swi(ch);
}
if(sum != 0)
{
a1[r] = sum;
r++;
}
long long value = 0;
for(int i = 0;i < r;++i)
{
printf("%d\n",a1[i]);
value += a1[i];
}
if(value == 0)
{
}
else
{
value /= r;
}
printf("%lld\n",value);
return 0;
}