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  1. #include <iostream>
  2. #include <fstream>
  3. #include <cstring>
  4.  
  5. using namespace std;
  6.  
  7. #define SIZE 50
  8. char record[SIZE];
  9.  
  10. class Student{
  11. private:
  12.     char id[10];
  13.     char name[20];
  14.     char address[20];
  15.  
  16. public:
  17.     void setData(){
  18.         cout << "enter your id:" << endl;
  19.         cin >> id;
  20.         cout << "enter your name:" << endl;
  21.         cin >> name;
  22.         cout << "enter your address:" << endl;
  23.         cin >> address;
  24.     }
  25.  
  26.     void printData(){
  27.         cout << "id: " << id << " name: " << name << " address: " << address << endl;
  28.     }
  29.  
  30.     void pack(){
  31.         strcpy(record, id);
  32.         strcat(record, "|");
  33.         strcat(record, name);
  34.         strcat(record, "|");
  35.         strcat(record, address);
  36.         while(strlen(record) <= SIZE -1){
  37.             strcat(record, "#");
  38.         }
  39.         strcat(record, "\n");
  40.     }
  41.  
  42.     void unpack(){
  43.       char* p;
  44.       p=strtok(record,"|");
  45.       strcpy(id,p);
  46.       p=strtok(NULL,"|");
  47.       strcpy(name,p);
  48.       p=strtok(NULL,"#");
  49.       strcpy(address,p);
  50.     }
  51.  
  52.     void insert(){
  53.         fstream file;
  54.         file.open("student.txt", ios::out | ios::app);
  55.         file << record;
  56.  
  57.         file.close();
  58.     }
  59.  
  60.     void display(){
  61.         fstream file;
  62.         file.open("student.txt", ios::in);
  63.         while(file.getline(record, SIZE+1, '\n')){
  64.             unpack();
  65.             printData();
  66.         }
  67.  
  68.         file.close();
  69.     }
  70.     void search(char* key){
  71.         ifstream Infile("student.txt");
  72.         while(Infile.getline(record, SIZE+1, '\n')){
  73.             unpack();
  74.             if(strcmp(key, id) == 0){
  75.  
  76.                 printData();
  77.             }
  78.  
  79.         }
  80.         Infile.close();
  81.     }
  82.  
  83.     void deleteD(char *key){
  84.         fstream in_file;
  85.         fstream out_file;
  86.  
  87.         in_file.open("student.txt",ios::in);
  88.         out_file.open("temp.txt",ios::out);
  89.  
  90.         while(!in_file.eof()){
  91.             in_file.getline(record,SIZE+1,'\n');
  92.             if(in_file.fail()) break;
  93.             unpack();
  94.             if(strcmp(key,id)==0){
  95.                 continue;
  96.             }
  97.             pack();
  98.             out_file<<record;
  99.         }
  100.         in_file.close();
  101.         out_file.close();
  102.         remove("student.txt");
  103.         rename("temp.txt","student.txt");
  104.     }
  105.  
  106.     void update(char *key){
  107.         fstream in_file;
  108.         fstream out_file;
  109.  
  110.         in_file.open("student.txt",ios::in);
  111.         out_file.open("temp.txt",ios::out);
  112.  
  113.         while(!in_file.eof()){
  114.             in_file.getline(record,SIZE+1,'\n');
  115.             if(in_file.fail()) break;
  116.             unpack();
  117.             if(strcmp(key,id)==0){
  118.                 setData();
  119.             }
  120.             pack();
  121.             out_file<<record;
  122.         }
  123.         in_file.close();
  124.         out_file.close();
  125.         remove("student.txt");
  126.         rename("temp.txt","student.txt");
  127.     }
  128.  
  129. };
  130.  
  131.  
  132. int main()
  133. {
  134.     Student obj;
  135.     //st.setData();
  136.     //st.pack();
  137.     //st.insert();
  138.     //st.unpack();
  139.     //st.printData();
  140.     //st.display();
  141.     //st.search();
  142.     //st.update("56565");
  143.  
  144.     return 0;
  145. }
  146.  
  147.  
  148.  
  149.  
  150.  
  151.  
  152.  
  153.  
  154.  
  155.  
  156.  
Success #stdin #stdout 0.01s 5280KB
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https://ideone.com/HnlWT2
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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