文件操作

//ps:生成圆形若干结点.ned文件

#include <ctime>
#include <cstdlib>
#include  <fstream.h>
#include <iomanip.h>


#include "math.h"


void createNodesFile(int nodeNum,double R)
{
double node_x = 0;
double node_y = 0;
ofstream fsNodes("C:\\Users\\wo\\Desktop\\nodes.ned");
if(!fsNodes) return ;
srand((unsigned)time(0));
int curNum=0;
while(nodeNum!=curNum)
{
node_x = rand()*1.0/RAND_MAX*2*R-R;
node_y = rand()*1.0/RAND_MAX*2*R-R;
if(node_x*node_x+node_y*node_y<(R*R))//成功
{
fsNodes<<"WSN0.node["<<curNum<<"].x = "<<node_x<< endl<<"WSN0.node["<<curNum<<"].y = "<<node_y<<endl;
curNum++;
}

}
fsNodes.close();

}

#include <fstream>
using namespace std;

ofstream fs("c:\\a.txt");

fs<<3<<endl;

fs.close();