c++文本文件的读写

数据结构课程设计成果╰(￣▽￣)╮

//从文件读入到内存

void Save(ALGraph *G)

{

string n =" ";

int i = 0,stah = 0,stam = 0,arrh = 0,arrm = 0,k;

double money; char * j;

char w = ' ';

ArcNode * p;

//从"City.txt"读入到内存

ifstream fin("City.txt"); //打开

while(!fin.eof()) //直至结束

{

getline(fin,n,' '); //从fin获取以结束的字符串放到n中

j = &n[0]; //从字符串转化为字符数组指针

strcpy(G->vertices[i].cityname,j); //从字符指针到字符数组，实现转化

G->vertices[i].trainarc = NULL;

G->vertices[i].planearc = NULL;

G->vexnum++; i++; }

fin.close(); //关闭文件

//从"Train.txt"到内存

ifstream fin2("Train.txt");

while(!fin2.eof()) { getline(fin2,n,' ');

j = &n[0];

k = LocateVex(G,j);

p = (ArcNode*)malloc(sizeof(ArcNode)); //头插

p->nextarc = G->vertices[k].trainarc;

G->vertices[k].trainarc = p;

getline(fin2,n,' ');

j = &n[0];

p->adjvex = LocateVex(G,j); //得到后续数据，更新

fin2 >> money >> stah >> stam >> arrh >> arrm; //读取数据

p->price = money;

p->statime.hour = stah;

p->statime.min = stam;

p->arrtime.hour = arrh;

p->arrtime.min = arrm;

} fin2.close(); }

void Output(ALGraph *G) {
int i;
ArcNode * p;

//从内存到"Train.txt"
ofstream fout2("Train.txt",ios::trunc);//打开文件并清空原来的数据
for(i = 0;i < G->vexnum - 1;i++) {
  p = G->vertices[i].trainarc;
  while(p) {   //直至最后，更新文件
   fout2 << G->vertices[i].cityname << " " << G->vertices[p->adjvex].cityname << " " << p->price << " ";//写入数据
   fout2 << p->statime.hour << " " << p->statime.min << " " << p->arrtime.hour << " " << p->arrtime.min;
   p = p->nextarc;
   if(p)
    fout2 << endl;
  }
}
fout2.close();
}