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

//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,'\n');  //从fin获取以\n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();}

转载于:https://www.cnblogs.com/amberamber/p/3321623.html

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