請寫一程式讀入rand.txt內的1000個數值,
算出這1000個數值的平均值,顯示於screen上
*/
#include
#include
#include
#include
#include
using namespace std;
int main(void)
{
int count=0 ;
char temp,test[4],n;
double final,sum=0,i;
ifstream ifile("d:\\rand.txt",ios::in);
if(ifile.is_open())
{
while(ifile.getline(test,4)!='\0')
{
i=atoi(test); //文字陣列轉int
sum=sum+i;
count+=1;
}
cout<<"平均數為"<<sum/count<<endl;
}
else
cout <<"檔案開啟失敗..." <<endl;
ifile.close();
system("pause");
return 0;
}
=========================
/*
合併A檔,B檔成為C檔
*/
#include
#include
#include
using namespace std;
int main(void)
{
char txt[80];
ifstream ifile1("d:\\aaa.txt",ios::in);
ifstream ifile2("d:\\bbb.txt",ios::in);
ofstream afile3("d:\\ccc.txt",ios::app);
while(!ifile1.eof()) // 判別是否讀到檔案的尾端
{
ifile1.getline(txt,80,'\n');
afile3 <<txt <<endl; }
while(!ifile2.eof()) // 判別是否讀到檔案的尾端
{
ifile2.getline(txt,80,'\n');
afile3 << txt <<endl;
}
cout << "已將檔案合併..." <<endl;
system("pause");
return 0;
}
讀檔:
ex1.
while(ifile.getline(test,4)!='\0')
ex2.
while(ifile.get(ch)!='\0')
txt[n++]=ch;