文件操作

1、输入输出重定向：

freopen("input.txt","r",stdin);freopen("output.txt","w",stdout); 

一般使用方法：

#define LOCALint main(){#ifdef LOCAL freopen("data.in","r",stdin); freopen("data.out","w",stdout);#endif} 

 

详细说明参见：http://www.slyar.com/blog/c-freopen-stdin-stdout.html

 

2、fopen：

一般使用方法：

int main(){ FILE *fin,*fout; fin = fopen("data.in","rb"); fout = fopen("data.out","wb"); while(fscanf(fin,"%d",&x) == 1) { } fprintf(fout,"%d %d %.3lf/n",min,max,(double)s/n); fclose(fin); fclose(fout); return 0;} 

 

详细说明参见：http://www.slyar.com/blog/c-file-input-output.html