c++简单的输入输出

#include<stdio.h>
void main()
{
int n,a,i,sum;
FILE *fin,*fout;
if((fin=fopen(“in.txt”,”r”))==NULL)
{
printf(“Input file open error!\n”);
return;
}

if((fout=fopen(“out.txt”,”w”))==NULL)
{
printf(“Output file open error!\n”);
return;
}

while(!feof(fin))
{
fscanf(fin,”%d “,&n);
for(i=0,sum=0;i<n;i++)
{
fscanf(fin,”%d”,&a);
sum+=a;
}
fprintf(fout,”%d\n”,sum);
}
fclose(fin);
fclose(fout);

}

http://blog.csdn.net/niu91/article/details/8793752